System.Linq.Expressions.Expression.Parameter(System.Type, string)

public override Action<T, object> CreateSet<T>(PropertyInfo propertyInfo)
        {
            ValidationUtils.ArgumentNotNull(propertyInfo, nameof(propertyInfo));

            // use reflection for structs
            // expression doesn't correctly set value
            if (propertyInfo.DeclaringType.IsValueType())
            {
                return LateBoundReflectionDelegateFactory.Instance.CreateSet<T>(propertyInfo);
            }

            Type instanceType = typeof(T);
            Type valueType = typeof(object);

            ParameterExpression instanceParameter = Expression.Parameter(instanceType, "instance");

            ParameterExpression valueParameter = Expression.Parameter(valueType, "value");
            Expression readValueParameter = EnsureCastExpression(valueParameter, propertyInfo.PropertyType);

            MethodInfo setMethod = propertyInfo.GetSetMethod(true);

            Expression setExpression;
            if (setMethod.IsStatic)
            {
                setExpression = Expression.Call(setMethod, readValueParameter);
            }
            else
            {
                Expression readInstanceParameter = EnsureCastExpression(instanceParameter, propertyInfo.DeclaringType);

                setExpression = Expression.Call(readInstanceParameter, setMethod, readValueParameter);
            }

            LambdaExpression lambdaExpression = Expression.Lambda(typeof(Action<T, object>), setExpression, instanceParameter, valueParameter);

            Action<T, object> compiled = (Action<T, object>)lambdaExpression.Compile();
            return compiled;
        }

private DynamicMetaObject CallMethodReturnLast<TBinder> (MethodInfo method, TBinder binder, Expression[] args, Expression value, Fallback<TBinder> fallback)
				where TBinder : DynamicMetaObjectBinder
			{
				//
				// First, call fallback to do default binding
				// This produces either an error or a call to a .NET member
				//
				DynamicMetaObject fallbackResult = fallback (this, binder, null);

				//
				// Build a new expression like:
				// {
				//   object result;
				//   TrySetMember(payload, result = value) ? result : fallbackResult
				// }
				//

				ParameterExpression result = Expression.Parameter (typeof (object), null);
				ParameterExpression callArgs = Expression.Parameter (typeof (object[]), null);
				ReadOnlyCollection<Expression> callArgsValue = GetConvertedArgs (args);

				var callDynamic = new DynamicMetaObject (
					Expression.Block (
						new TrueReadOnlyCollection<ParameterExpression> (result, callArgs),
						new TrueReadOnlyCollection<Expression> (
							Expression.replacedign (callArgs, Expression.NewArrayInit (typeof (object), callArgsValue)),
							Expression.Condition (
								Expression.Call (
									GetLimitedSelf (),
									method,
									BuildCallArgs (
										binder,
										method.Name == "TryInvokeMember", // JJA
										args,
										callArgs,
										Expression.replacedign (result, Expression.Convert (value, typeof (object)))
									)
								),
								Expression.Block (
									ReferenceArgreplacedign (callArgs, args),
									result
								),
								fallbackResult.Expression,
								typeof (object)
							)
						)
					),
					GetRestrictions ().Merge (fallbackResult.Restrictions)
				);

				//
				// Now, call fallback again using our new MO as the error
				// When we do this, one of two things can happen:
				//   1. Binding will succeed, and it will ignore our call to
				//      the dynamic method, OR
				//   2. Binding will fail, and it will use the MO we created
				//      above.
				//
				return fallback (this, binder, callDynamic);
			}

[Fact]
        public void ShouldIterateArray()
        {
            ParameterExpression output = Expression.Parameter(typeof(List<string>), "output");
            ParameterExpression item = Expression.Variable(typeof(string), "item");
            ConstantExpression items = Expression.Constant(new[] { "hello", "world" });

            List<string> addedItems = new List<string>();

            ForEachExpression loop = X.ForEach(item, items,
                Expression.Call(output, nameof(List<string>.Add), null, item)
            );

            Expression
                .Lambda<Action<List<string>>>(loop, output)
                .Compile()(addedItems);

            addedItems.Count.ShouldBe(2);
            addedItems[0].ShouldBe("hello");
            addedItems[1].ShouldBe("world");
        }

static Func<T, Dictionary<string, string>> CompileSerializer()
        {
            var o_t = typeof(T);
            var o = Expression.Parameter(o_t, "original");
            var o_get_object_data = o_t.GetMethod("GetObjectData");

            var d_t = typeof(Dictionary<string, string>);
            var d = Expression.Variable(d_t, "d"); // define object variable
            var d_init = Expression.MemberInit(Expression.New(d_t)); // object ctor
            var d_add = d_t.GetMethod("Add"); // add method

            var fc_t = typeof(LocalVariableInfo);
            var fc = Expression.Variable(fc_t, "fc");
            var fc_init = Expression.MemberInit(Expression.New(fc_t));

            var info_t = typeof(SerializationInfo);
            var info = Expression.Variable(info_t, "info");
            var info_ctor = info_t.GetConstructor(new[] { typeof(Type), fc_t });
            var info_init = Expression.MemberInit(Expression.New(info_ctor, Expression.Constant(o_t), fc));
            var info_get_enumerator = info_t.GetMethod("GetEnumerator");

            var ctx_t = typeof(StreamingContext);
            var ctx = Expression.Variable(ctx_t, "ctx");
            var ctx_init = Expression.MemberInit(Expression.New(ctx_t));

            var enumerator_t = typeof(SerializationInfoEnumerator);
            var enumerator = Expression.Variable(enumerator_t, "enumerator");
            var enumerator_move_next = enumerator_t.GetMethod("MoveNext");
            var enumerator_name = Expression.Property(enumerator, "Name");
            var enumerator_value = Expression.Property(enumerator, "Value");
            var mi_to_string = typeof(Object).GetMethod("ToString", new Type[0]);
            var exit_loop = Expression.Label("exit_loop");
            var body = Expression.Block(new[] { d, fc, info, ctx },
                Expression.replacedign(d, d_init),
                Expression.replacedign(fc, fc_init),
                Expression.replacedign(info, info_init),
                Expression.replacedign(ctx, ctx_init),
                Expression.Call(o, o_get_object_data, info, ctx),

                Expression.Block(new[] { enumerator },
                    Expression.replacedign(enumerator, Expression.Call(info, info_get_enumerator)),
                    Expression.Loop(
                        Expression.IfThenElse(
                            Expression.Call(enumerator, enumerator_move_next), // test
                            Expression.IfThen(
                                Expression.NotEqual(enumerator_value, Expression.Constant(null)),
                                Expression.Call(d, d_add, enumerator_name, Expression.Call(enumerator_value, mi_to_string))
                            ),
                            Expression.Break(exit_loop)), // if false
                        exit_loop)),
                d); // return

            // compile
            return Expression.Lambda<Func<T, Dictionary<string, string>>>(body, o)
                .Compile();
        }

private static Delegate MakeNullableDeserializer([NotNull] Type nullableType, [NotNull] Type type, [NotNull] Delegate decoder)
		{
			Contract.Requires(nullableType != null && type != null && decoder != null);
			// We have a Decoder of T, but we have to transform it into a Decoder for Nullable<T>, which returns null if the slice is "nil", or falls back to the underlying decoder if the slice contains something

			var prmSlice = Expression.Parameter(typeof(Slice), "slice");
			var body = Expression.Condition(
				// IsNilSegment(slice) ?
				Expression.Call(typeof(FdbTuplePackers).GetMethod("IsNilSegment", BindingFlags.Static | BindingFlags.NonPublic), prmSlice),
				// True => default(Nullable<T>)
				Expression.Default(nullableType),
				// False => decoder(slice)
				Expression.Convert(Expression.Invoke(Expression.Constant(decoder), prmSlice), nullableType)
			);

			return Expression.Lambda(body, prmSlice).Compile();
		}

protected void SetType(Type lambdaType, Type smType)
        {
            Requires.NotNull(lambdaType, nameof(lambdaType));
            Requires.NotNull(smType, nameof(smType));

            _type = lambdaType;
            _end  = Label(lambdaType, "end");

            _state = Parameter(smType, "state");
            _vsmCtor = smType.GetTypeInfo().DeclaredConstructors.First(x => x.GetParameters().Length == 0);
        }

public override ObjectConstructor<object> CreateParameterizedConstructor(MethodBase method)
        {
            ValidationUtils.ArgumentNotNull(method, nameof(method));

            Type type = typeof(object);

            ParameterExpression argsParameterExpression = Expression.Parameter(typeof(object[]), "args");

            Expression callExpression = BuildMethodCall(method, type, null, argsParameterExpression);

            LambdaExpression lambdaExpression = Expression.Lambda(typeof(ObjectConstructor<object>), callExpression, argsParameterExpression);

            ObjectConstructor<object> compiled = (ObjectConstructor<object>)lambdaExpression.Compile();
            return compiled;
        }

static Func<T, Dictionary<string, string>> CompilePropertySerializer()
        {
            var o_t = typeof(T);
            var o = Expression.Parameter(o_t, "o");

            var d_t = typeof(Dictionary<string, string>);
            var d = Expression.Variable(d_t, "d");
            var d_init = Expression.MemberInit(Expression.New(d_t));
            var d_add = d_t.GetMethod("Add");
            var d_setters = o_t.GetProperties(BindingFlags.Public | BindingFlags.Instance) // build setters via Add(k,v)
                .Where(x => x.CanRead)
                .Select(x =>
                {
                    var prop = Expression.Property(o, x.Name);
                    var prop_mi_to_string = x.PropertyType.GetMethod("ToString", new Type[0]);
                    var add_to_dict = Expression.Call(d, d_add, Expression.Constant(x.Name), Expression.Call(prop, prop_mi_to_string));

                    if (!x.PropertyType.IsByRef)
                        return (Expression)add_to_dict;
                    else
                        return (Expression)Expression.IfThen(
                            Expression.Not(Expression.Equal(prop, Expression.Constant(null))),
                            add_to_dict);
                });

            // run this
            var body = Expression.Block(new[] { d }, // scope variables
                Expression.replacedign(d, d_init), // initialize
                Expression.Block(d_setters), // set
                d); // return

            return Expression.Lambda<Func<T, Dictionary<string, string>>>(body, o)
                .Compile();
        }

protected override Expression VisitConstant(ConstantExpression c)
        {
            var p = Expression.Parameter(c.Type, "p" + _parameters.Count);
            _parameters.Add(p);
            return p;
        }

internal static void SetRepositoryDataFilter(object repos, Action<FluentDataFilter> scopedDataFilter) {
			if (scopedDataFilter != null) {
				SetRepositoryDataFilter(repos, null);
			}
			if (scopedDataFilter == null) {
				scopedDataFilter = _globalDataFilter;
			}
			if (scopedDataFilter == null) return;
			using (var globalFilter = new FluentDataFilter()) {
				scopedDataFilter(globalFilter);

				var type = repos.GetType();
				Type enreplacedyType = (repos as IBaseRepository).EnreplacedyType;
				if (enreplacedyType == null) throw new Exception("FreeSql.Repository 设置过滤器失败，原因是对象不属于 IRepository");

				var notExists = _dicSetRepositoryDataFilterConvertFilterNotExists.GetOrAdd(type, t => new ConcurrentDictionary<string, bool>());
				var newFilter = new Dictionary<string, LambdaExpression>();
				foreach (var gf in globalFilter._filters) {
					if (notExists.ContainsKey(gf.name)) continue;

					LambdaExpression newExp = null;
					var filterParameter1 = Expression.Parameter(enreplacedyType, gf.exp.Parameters[0].Name);
					try {
						newExp = Expression.Lambda(
							typeof(Func<,>).MakeGenericType(enreplacedyType, typeof(bool)),
							new ReplaceVisitor().Modify(gf.exp.Body, filterParameter1),
							filterParameter1
						);
					} catch {
						notExists.TryAdd(gf.name, true); //防止第二次错误
						continue;
					}
					newFilter.Add(gf.name, newExp);
				}
				if (newFilter.Any() == false) return;

				var del = _dicSetRepositoryDataFilterApplyDataFilterFunc.GetOrAdd(type, t => {
					var reposParameter = Expression.Parameter(type);
					var nameParameter = Expression.Parameter(typeof(string));
					var expressionParameter = Expression.Parameter(
						typeof(Expression<>).MakeGenericType(typeof(Func<,>).MakeGenericType(enreplacedyType, typeof(bool)))
					);
					return Expression.Lambda(
						Expression.Block(
							Expression.Call(reposParameter, type.GetMethod("ApplyDataFilter", BindingFlags.Instance | BindingFlags.NonPublic), nameParameter, expressionParameter)
						),
						new[] {
						reposParameter, nameParameter, expressionParameter
						}
					).Compile();
				});
				foreach (var nf in newFilter) {
					del.DynamicInvoke(repos, nf.Key, nf.Value);
				}
				newFilter.Clear();
			}
		}

private static Expression<Func<TParameter, bool>> ContainsPropertyValueEqual<TParameter>(string crmPropertyName, IEnumerable<Guid> values)
		{
			var parameterType = typeof(TParameter);

			var parameter = Expression.Parameter(parameterType, parameterType.Name.ToLowerInvariant());

			var expression = ContainsPropertyValueEqual(crmPropertyName, values, parameter);

			return Expression.Lambda<Func<TParameter, bool>>(expression, parameter);
		}

public Func<int, int> Compile()
        {
            _param = Expression.Parameter(typeof(int), "n");

            Expression expression = Visit(_syntaxTree);

            var lambda = Expression.Lambda<Func<int, int>>(expression, _param);
            return lambda.Compile();
        }

public static Expression<Func<object, bool>> GetObjectWhereExpression(TableInfo tb, Type enreplacedyType, string csName, object constValue) {
			var mwhereParamExp = Expression.Parameter(typeof(object), "a");
			var mwhereExp = Expression.Lambda<Func<object, bool>>(
				Expression.Equal(
					Expression.MakeMemberAccess(
						Expression.TypeAs(mwhereParamExp, enreplacedyType),
						tb.Properties[csName]
					),
					Expression.Constant(constValue)
				),
				mwhereParamExp
			);
			return mwhereExp;
		}

public override Func<T, object> CreateGet<T>(FieldInfo fieldInfo)
        {
            ValidationUtils.ArgumentNotNull(fieldInfo, nameof(fieldInfo));

            ParameterExpression sourceParameter = Expression.Parameter(typeof(T), "source");

            Expression fieldExpression;
            if (fieldInfo.IsStatic)
            {
                fieldExpression = Expression.Field(null, fieldInfo);
            }
            else
            {
                Expression sourceExpression = EnsureCastExpression(sourceParameter, fieldInfo.DeclaringType);

                fieldExpression = Expression.Field(sourceExpression, fieldInfo);
            }

            fieldExpression = EnsureCastExpression(fieldExpression, typeof(object));

            Func<T, object> compiled = Expression.Lambda<Func<T, object>>(fieldExpression, sourceParameter).Compile();
            return compiled;
        }

static Func<T, Dictionary<string, string>> CompileSerializer()
        {
            var o_t = typeof(T);
            var o = Expression.Parameter(o_t, "original");
            var o_get_object_data = o_t.GetMethod("GetObjectData");

            var d_t = typeof(Dictionary<string, string>);
            var d = Expression.Variable(d_t, "d"); // define object variable
            var d_init = Expression.MemberInit(Expression.New(d_t)); // object ctor
            var d_add = d_t.GetMethod("Add"); // add method

            var fc_t = typeof(IFormatterConverter);// typeof(LocalVariableInfo);
            var fc = Expression.Variable(fc_t, "fc");
            var fc_init = Expression.MemberInit(Expression.New(typeof(System.Runtime.Serialization.FormatterConverter))); //Expression.MemberInit(Expression.New(fc_t));

            var info_t = typeof(SerializationInfo);
            var info = Expression.Variable(info_t, "info");
            var info_ctor = info_t.GetConstructor(new[] { typeof(Type), fc_t });
            var info_init = Expression.MemberInit(Expression.New(info_ctor, Expression.Constant(o_t), fc));
            var info_get_enumerator = info_t.GetMethod("GetEnumerator");

            var ctx_t = typeof(StreamingContext);
            var ctx = Expression.Variable(ctx_t, "ctx");
            var ctx_init = Expression.MemberInit(Expression.New(ctx_t));

            var enumerator_t = typeof(SerializationInfoEnumerator);
            var enumerator = Expression.Variable(enumerator_t, "enumerator");
            var enumerator_move_next = enumerator_t.GetMethod("MoveNext");
            var enumerator_name = Expression.Property(enumerator, "Name");
            var enumerator_value = Expression.Property(enumerator, "Value");
            var mi_to_string = typeof(Object).GetMethod("ToString", new Type[0]);
            var exit_loop = Expression.Label("exit_loop");
            var body = Expression.Block(new[] { d, fc, info, ctx },
                Expression.replacedign(d, d_init),
                Expression.replacedign(fc, fc_init),
                Expression.replacedign(info, info_init),
                Expression.replacedign(ctx, ctx_init),
                Expression.Call(o, o_get_object_data, info, ctx),

                Expression.Block(new[] { enumerator },
                    Expression.replacedign(enumerator, Expression.Call(info, info_get_enumerator)),
                    Expression.Loop(
                        Expression.IfThenElse(
                            Expression.Call(enumerator, enumerator_move_next), // test
                            Expression.IfThen(
                                Expression.NotEqual(enumerator_value, Expression.Constant(null)),
                                Expression.Call(d, d_add, enumerator_name, Expression.Call(enumerator_value, mi_to_string))
                            ),
                            Expression.Break(exit_loop)), // if false
                        exit_loop)),
                d); // return

            // compile
            return Expression.Lambda<Func<T, Dictionary<string, string>>>(body, o)
                .Compile();
        }

private DynamicMetaObject CallMethodReturnLast(string methodName, DynamicMetaObjectBinder binder, Expression[] args, Fallback fallback)
        {
            //
            // First, call fallback to do default binding
            // This produces either an error or a call to a .NET member
            //
            DynamicMetaObject fallbackResult = fallback(null);

            //
            // Build a new expression like:
            // {
            //   object result;
            //   TrySetMember(payload, result = value) ? result : fallbackResult
            // }
            //
            ParameterExpression result = Expression.Parameter(typeof(object), null);

            IList<Expression> callArgs = new List<Expression>();
            callArgs.Add(Expression.Convert(Expression, typeof(T)));
            callArgs.Add(Constant(binder));
            callArgs.AddRange(args);
            callArgs[args.Length + 1] = Expression.replacedign(result, callArgs[args.Length + 1]);

            DynamicMetaObject callDynamic = new DynamicMetaObject(
                Expression.Block(
                    new[] { result },
                    Expression.Condition(
                        Expression.Call(
                            Expression.Constant(_proxy),
                            typeof(DynamicProxy<T>).GetMethod(methodName),
                            callArgs
                            ),
                        result,
                        fallbackResult.Expression,
                        typeof(object)
                        )
                    ),
                GetRestrictions().Merge(fallbackResult.Restrictions)
                );

            //
            // Now, call fallback again using our new MO as the error
            // When we do this, one of two things can happen:
            //   1. Binding will succeed, and it will ignore our call to
            //      the dynamic method, OR
            //   2. Binding will fail, and it will use the MO we created
            //      above.
            //
            return _dontFallbackFirst ? callDynamic : fallback(callDynamic);
        }

[Fact]
        public void ShouldCreateComplexIterator()
        {
            ParameterExpression i = Expression.Parameter(typeof(int), "i");

            IteratorExpression enumerable = X.Enumerable(
                X.While(Expression.LessThan(i, 20.AsExpression()),
                    X.Yield(Expression.PostIncrementreplacedign(i))
                )
            );

            enumerable
                .Compile<int>()
                .SequenceEqual(Enumerable.Range(0, 20))
                .ShouldBeTrue();
        }

public static LambdaExpression CreatePropertyExpression<T>(string PropertyName)
        {
            var enreplacedyType = typeof(T);
            ParameterExpression arg = Expression.Parameter(enreplacedyType, "x");

            // The property name might be a nested expression like a.b.c
            var path = PropertyName.Split('.');
            MemberExpression currentPath = null;

            foreach (var p in path)
            {
                if (currentPath == null)
                {
                    currentPath = Expression.Property(arg, p);
                }
                else
                {
                    currentPath = Expression.Property(currentPath, p);
                }
            }

            var selector = Expression.Lambda(currentPath, new ParameterExpression[] { arg });

            return selector;
        }

private static Expression BuildDeserializeCore(Type t, ObjectSerializationInfo serializationInfo)
        {
            List<Expression> ary = new List<Expression>();
            LabelTarget returnTarget = Expression.Label(t, "returnLable");
            //int num;
            ParameterExpression num = Expression.Variable(typeof(int), "num");
            //int for-i;
            ParameterExpression forVariable = Expression.Variable(typeof(int), "i");

            //context.option.Security.DepthStep(ref reader);
            ary.Add(CommonExpressionMeta.Call_DeserializeContext_Option_Security_DepthStep);

            //if(reader.TryReadNullWithEnsureBuildInType(BssomType.Array3))
            //      return default(t);
            ary.Add(Expression.IfThen(CommonExpressionMeta.Call_Reader_TryReadNullWithEnsureBuildInType(BssomType.Array3),
                Expression.Return(returnTarget, Expression.Default(t))));

            //T t = new T();
            ParameterExpression instance = Expression.Parameter(t, "instance");
            if (serializationInfo.IsDefaultNoArgsCtor)
            {
                ary.Add(Expression.replacedign(instance, Expression.New(t)));
            }
            else
            {
                ParameterInfo[] parInfos = serializationInfo.BestmatchConstructor.GetParameters();
                Expression[] pars = new Expression[parInfos.Length];
                if (serializationInfo.ConstructorParametersIsDefaultValue)
                {
                    for (int i = 0; i < parInfos.Length; i++)
                    {
                        pars[i] = Expression.Default(parInfos[i].ParameterType);
                    }
                    ary.Add(Expression.replacedign(instance, Expression.New(serializationInfo.BestmatchConstructor, pars)));
                }
                else
                {
                    object[] cps = serializationInfo.ConstructorParameters;
                    for (int i = 0; i < parInfos.Length; i++)
                    {
                        pars[i] = Expression.Constant(cps[i], parInfos[i].ParameterType);
                    }
                    ary.Add(Expression.replacedign(instance, Expression.New(serializationInfo.BestmatchConstructor, pars)));
                }
            }

            //reader.SkipVariableNumber()
            ary.Add(CommonExpressionMeta.Call_Reader_SkipVariableNumber);
            //num = reader.ReadVariableNumber()
            ary.Add(Expression.replacedign(num, CommonExpressionMeta.Call_Reader_ReadVariableNumber));
            //i = 0;
            ary.Add(Expression.replacedign(forVariable, Expression.Constant(0)));

            var members = serializationInfo.SerializeMemberInfos;
            if (members.Length > 0)
            {
                //reader.Buffer.Seek(offsetSegment, Current)
                ary.Add(CommonExpressionMeta.Call_Reader_BufferSeek(Expression.Convert(Expression.Multiply(num, Expression.Constant(BssomBinaryPrimitives.FixUInt32NumberSize)), typeof(Int64)), BssomSeekOrgin.Current));
                //switch(i)
                //  case 0: instance.Key0 = readValue();
                //  case 3: instance.Key1 = readValue();
                //  case 5: instance.Key2 = readValue();
                //  default: skipObj();
                FieldInfo memFormatters = serializationInfo.StoreMemberFormatterInstances();
                SwitchCase[] switchCases = new SwitchCase[members.Length];
                for (int i = 0; i < members.Length; i++)
                {
                    switchCases[i] = Expression.SwitchCase(SpecialCodeGenExpression.ReadValues(members[i], instance, memFormatters), Expression.Constant(members[i].KeyIndex));
                }
                Expression content = Expression.Switch(
                    typeof(void),
                    forVariable,
                    CommonExpressionMeta.Call_Reader_SkipObject,
                    null,
                    switchCases
                    );

                ary.Add(For(forVariable, Expression.LessThan(forVariable, num), Expression.replacedign(forVariable, Expression.Add(forVariable, Expression.Constant(1))), content));
            }
            //context.Depth--;
            ary.Add(CommonExpressionMeta.Call_DeserializeContext_Depth_Decrementreplacedign);

            ary.Add(Expression.Return(returnTarget, instance));

            ary.Add(Expression.Label(returnTarget, instance));

            return Expression.Block(new ParameterExpression[] { instance, num, forVariable, }, ary);
        }

public Func<List<object>, object> Generate(Expression exp)
        {
            _parameterCount = 0;
            _parametersExpression =
                Expression.Parameter(typeof(List<object>), "parameters");

            var body = this.Visit(exp); // normalize
            if (body.Type != typeof(object))
            {
                body = Expression.Convert(body, typeof(object));
            }

            var lambda = Expression.Lambda<Func<List<object>, object>>(body, _parametersExpression);
            return lambda.Compile();
        }

public static Pawn GetPawn(this Pawn_JobTracker keeper)
        {
            /*
            FieldInfo fieldInfo = typeof(Pawn_JobTracker).GetField("pawn", BindingFlags.Instance | BindingFlags.NonPublic);
            Pawn result = (Pawn)fieldInfo.GetValue(keeper);
            return result;
            */
            if (GetPawnFromPawn_JobTracker == null)
            {
                ParameterExpression keeperArg = Expression.Parameter(typeof(Pawn_JobTracker), "keeper"); // SecretKeeper keeper argument
                Expression secretAccessor = Expression.Field(keeperArg, "pawn"); // keeper._secret
                var lambda = Expression.Lambda<Func<Pawn_JobTracker, Pawn>>(secretAccessor, keeperArg);
                GetPawnFromPawn_JobTracker = lambda.Compile(); // Получается функция return result = keeper._secret;
            }
            return GetPawnFromPawn_JobTracker(keeper);
        }

private static Delegate CreateCaster(Type type)
		{
			var prm = Expression.Parameter(typeof(object), "value");
			//TODO: valuetype vs ref type ?
			var body = Expression.Convert(prm, type);
			var lambda = Expression.Lambda(body, true, prm);
			return lambda.Compile();
		}

internal static void Factory(DynamicFormatterreplacedembly replacedembly, ObjectSerializationInfo objectSerializationInfo)
        {
            ParameterExpression instance = Expression.Parameter(objectSerializationInfo.Type, "value");

            Expression<Serialize<T>> serializeExpression = Array3DynamicExpressionBuild.BuildSerializeLambda<T>(objectSerializationInfo, instance);
            Expression<Size<T>> sizeExpression = Array3DynamicExpressionBuild.BuildSizeLambda<T>(objectSerializationInfo, instance);
            Expression<Deserialize<T>> deserializeExpression = Array3DynamicExpressionBuild.BuildDeserializeLambda<T>(objectSerializationInfo);

            Serialize = serializeExpression.Compile();
            Size = sizeExpression.Compile();
            Deserialize = deserializeExpression.Compile();

#if NETFRAMEWORK
            TypeBuilder typeBuilder = replacedembly.DefineFormatterDelegateType(objectSerializationInfo.Type);
            MethodBuilder serializeDelegate = TypeBuildHelper.DefineSerializeDelegate(typeBuilder, typeof(T));
            serializeExpression.CompileToMethod(serializeDelegate);
            MethodBuilder sizeDelegate = TypeBuildHelper.DefineSizeDelegate(typeBuilder, typeof(T));
            sizeExpression.CompileToMethod(sizeDelegate);
            MethodBuilder deserializeDelegate = TypeBuildHelper.DefineDeserializeDelegate(typeBuilder, typeof(T));
            deserializeExpression.CompileToMethod(deserializeDelegate);
            typeBuilder.CreateTypeInfo();
#endif
        }

private static Func<TextSpan, T> CompileFactory<T>(Type tokenType)
            where T : IToken
        {
            var spanParam = Expression.Parameter(typeof(TextSpan), "span");
            var newExpression = Expression.New(tokenType.GetConstructor(new[] { typeof(TextSpan) }), spanParam);
            var factory =
                Expression.Lambda<Func<TextSpan, T>>(
                    newExpression, spanParam);
            return factory.Compile();
        }

public static void CopyData(Type sourceType, object source, object target)
        {
            if (source == null) return;
            if (target == null) return;
            _copyDataFunc.GetOrAdd(sourceType, type =>
            {
                var sourceParamExp = Expression.Parameter(typeof(object), "sourceObject");
                var targetParamExp = Expression.Parameter(typeof(object), "targetObject");
                var sourceExp = Expression.Variable(type, "source");
                var targetExp = Expression.Variable(type, "target");
                var copyExps = new List<Expression>();
                var sourceFields = type.GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
                foreach (var field in sourceFields)
                    copyExps.Add(Expression.replacedign(Expression.MakeMemberAccess(targetExp, field), Expression.MakeMemberAccess(sourceExp, field)));

                if (copyExps.Any() == false) return _copyDataFuncEmpty;
                var bodyExp = Expression.Block(
                    new[] {
                            sourceExp, targetExp
                    },
                    new[] {
                            Expression.IfThen(
                                Expression.NotEqual(sourceParamExp, Expression.Constant(null)),
                                Expression.IfThen(
                                    Expression.NotEqual(targetParamExp, Expression.Constant(null)),
                                    Expression.Block(
                                        Expression.replacedign(sourceExp, Expression.TypeAs(sourceParamExp, sourceType)),
                                        Expression.replacedign(targetExp, Expression.TypeAs(targetParamExp, sourceType)),
                                        Expression.IfThen(
                                            Expression.NotEqual(sourceExp, Expression.Constant(null)),
                                            Expression.IfThen(
                                                Expression.NotEqual(sourceExp, Expression.Constant(null)),
                                                Expression.Block(
                                                    copyExps.ToArray()
                                                )
                                            )
                                        )
                                    )
                                )
                            )
                    }
                );
                return Expression.Lambda<Action<object, object>>(bodyExp, sourceParamExp, targetParamExp).Compile();
            })(source, target);
        }

private static Expression<Func<TParameter, bool>> ContainsPropertyValueEqual<TParameter>(string propertyName1,
			string propertyName2, IEnumerable<Tuple<string, string>> values)
		{
			var parameterType = typeof(TParameter);

			var parameter = Expression.Parameter(parameterType, parameterType.Name.ToLowerInvariant());

			var expression = ContainsPropertyValueEqual(propertyName1, propertyName2, values, parameter);

			return Expression.Lambda<Func<TParameter, bool>>(expression, parameter);
		}

public virtual IEnumerable<IIssue> SelectIssues(int startRowIndex = 0, int maximumRows = -1)
		{
			if (startRowIndex < 0)
			{
				throw new ArgumentException("Value must be a positive integer.", "startRowIndex");
			}

			if (maximumRows == 0)
			{
				return new IIssue[] { };
			}

			var serviceContext = Dependencies.GetServiceContext();

			var includeUnapprovedIssues = TryreplacedertIssuePreviewPermission(serviceContext);

			var query = serviceContext.CreateQuery("adx_issue")
				.Where(issue => issue.GetAttributeValue<EnreplacedyReference>("adx_issueforumid") == IssueForum
					&& issue.GetAttributeValue<OptionSetValue>("statecode") != null && issue.GetAttributeValue<OptionSetValue>("statecode").Value == 0);

			if (!includeUnapprovedIssues)
			{
				query = query.Where(issue => issue.GetAttributeValue<bool?>("adx_approved").GetValueOrDefault(false));
			}

			if (Priority.HasValue)
			{
				query = query.Where(issue => issue.GetAttributeValue<OptionSetValue>("adx_priority") != null && issue.GetAttributeValue<OptionSetValue>("adx_priority").Value == Priority.Value);
			}

			if (Status.Any())
			{
				var param = Expression.Parameter(typeof(Enreplacedy), "issue");

				var left =
					Expression.Call(
						param,
						"GetAttributeValue",
						new[] { typeof(int) },
						Expression.Constant("statuscode"));

				var statusEquals = Status.Aggregate<int, Expression>(null, (current, status) =>
					current == null
						? Expression.Equal(left, Expression.Constant(status))
						: Expression.OrElse(current, Expression.Equal(left, Expression.Constant(status))));

				var statusPredicate = Expression.Lambda(statusEquals, param) as Expression<Func<Enreplacedy, bool>>;

				query = query.Where(statusPredicate);
			}

			query = query.OrderByDescending(issue => issue.GetAttributeValue<DateTime?>("adx_date"));

			if (startRowIndex > 0)
			{
				query = query.Skip(startRowIndex);
			}

			if (maximumRows > 0)
			{
				query = query.Take(maximumRows);
			}

			return new IssueFactory(serviceContext, Dependencies.GetHttpContext()).Create(query);
		}

public static Expression<Func<object, bool>> GetObjectWhereExpressionContains(TableInfo tb, Type enreplacedyType, string csName, object[] arrayValue) {
			var mwhereParamExp = Expression.Parameter(typeof(object), "a");
			var selectExp = arrayValue.Select(c => Expression.Convert(Expression.Constant(FreeSql.Internal.Utils.GetDataReaderValue(tb.Columns[csName].CsType, c)), tb.Columns[csName].CsType)).ToArray();
			var mwhereExp = Expression.Lambda<Func<object, bool>>(
				Expression.Call(
					Utils.GetLinqContains(tb.Columns[csName].CsType),
					Expression.NewArrayInit(
						tb.Columns[csName].CsType,
						selectExp
					),
					Expression.MakeMemberAccess(Expression.TypeAs(mwhereParamExp, enreplacedyType), tb.Properties[csName])
				),
				mwhereParamExp);
			return mwhereExp;
		}

static Func<Dictionary<string, string>, T> CompileDeserializer()
        {
            var o_t = typeof(T);
            var o_ctor = o_t.GetConstructor(new[] { typeof(SerializationInfo), typeof(StreamingContext) });

            var d_t = typeof(Dictionary<string, string>);
            var d = Expression.Parameter(d_t, "d");
            var d_mi_get_enumerator = d_t.GetMethod("GetEnumerator");

            var fc_t = typeof(LocalVariableInfo);
            var fc = Expression.Variable(fc_t, "fc");
            var fc_init = Expression.MemberInit(Expression.New(fc_t));

            var info_t = typeof(SerializationInfo);
            var info = Expression.Variable(info_t, "info");
            var info_ctor = info_t.GetConstructor(new[] { typeof(Type), fc_t });
            var info_init = Expression.MemberInit(Expression.New(info_ctor, Expression.Constant(o_t), fc));
            var info_mi_add_value = info_t.GetMethod("AddValue", new[] { typeof(String), typeof(Object) });

            var ctx_t = typeof(StreamingContext);
            var ctx = Expression.Variable(ctx_t, "ctx");
            var ctx_init = Expression.MemberInit(Expression.New(ctx_t));

            var enumerator_t = typeof(Dictionary<string, string>.Enumerator);
            var enumerator = Expression.Variable(enumerator_t, "enumerator");
            var enumerator_mi_move_next = enumerator_t.GetMethod("MoveNext");
            var enumerator_current = Expression.Property(enumerator, "Current");

            var kvp_t = typeof(KeyValuePair<string, string>);
            var kvp_pi_key = kvp_t.GetProperty("Key");
            var kvp_pi_value = kvp_t.GetProperty("Value");

            var exit_loop = Expression.Label("exit_loop");

            var body = Expression.Block(new[] { fc, info, ctx, enumerator },
                Expression.replacedign(fc, fc_init),
                Expression.replacedign(info, info_init),
                Expression.replacedign(ctx, ctx_init),
                Expression.replacedign(enumerator, Expression.Call(d, d_mi_get_enumerator)),

                Expression.Loop(
                    Expression.IfThenElse(
                        Expression.Call(enumerator, enumerator_mi_move_next),
                        Expression.Call(info, info_mi_add_value, Expression.Property(enumerator_current, kvp_pi_key), Expression.Property(enumerator_current, kvp_pi_value)),
                        Expression.Break(exit_loop)),
                    exit_loop),

                Expression.MemberInit(Expression.New(o_ctor, info, ctx))
            );

            return Expression.Lambda<Func<Dictionary<string, string>, T>>(body, d)
                .Compile();
        }

static Func<Dictionary<string, string>, T> CompilePropertyDeserializer()
        {
            var o_t = typeof(T);
            var o = Expression.Variable(o_t, "o");
            var o_new = Expression.New(typeof(T));

            var d_t = typeof(Dictionary<string, string>);
            var d = Expression.Parameter(d_t, "d");
            var d_mi_try_get_value = d_t.GetMethod("TryGetValue");

            var item_t = typeof(String);
            var item = Expression.Variable(item_t, "item");

            var tc_t = typeof(TypeConverter);
            var tc = Expression.Variable(tc_t, "tc");
            var tc_mi_can_convert_from = tc_t.GetMethod("CanConvertFrom", new[] { typeof(Type) });
            var tc_mi_convert_from = tc_t.GetMethod("ConvertFrom", new[] { typeof(Object) });

            var td_t = typeof(TypeDescriptor);
            var td_mi_get_converter = td_t.GetMethod("GetConverter", new[] { typeof(Type) });

            var binds = o_t.GetProperties(BindingFlags.Public | BindingFlags.Instance)
                .Where(x => x.CanRead)
                .Select(x =>
                {
                    var value_t = x.PropertyType;
                    var value = Expression.Variable(value_t, "value");
                    var target = Expression.Label(x.PropertyType);

                    return Expression.Bind(x, Expression.Block(new[] { item, value },
                        Expression.replacedign(tc, Expression.Call(null, td_mi_get_converter, Expression.Constant(x.PropertyType))),
                        Expression.IfThen(
                            Expression.Call(d, d_mi_try_get_value, Expression.Constant(x.Name), item),
                            Expression.IfThen(
                                Expression.NotEqual(item, Expression.Constant(null)),
                                Expression.IfThen(
                                    Expression.Call(tc, tc_mi_can_convert_from, Expression.Constant(typeof(String))),
                                    Expression.Block(
                                        Expression.replacedign(value, Expression.Convert(Expression.Call(tc, tc_mi_convert_from, item), x.PropertyType)),
                                        Expression.Return(target, value, x.PropertyType))))),
                        Expression.Label(target, value)
                    ));
                }).ToArray();

            var body = Expression.Block(new[] { o, tc },
                Expression.MemberInit(o_new, binds)
            );

            return Expression.Lambda<Func<Dictionary<string, string>, T>>(body, d)
                .Compile();
        }

public static IOrderedQueryable<T> CallOrderedQueryable<T>(this IQueryable<T> query, string methodName, string propertyName,
                IComparer<object> comparer = null)
        {
            var param = Expression.Parameter(typeof(T), "x");

            var body = propertyName.Split('.').Aggregate<string, Expression>(param, Expression.PropertyOrField);

            return comparer != null
                ? (IOrderedQueryable<T>)query.Provider.CreateQuery(
                    Expression.Call(
                        typeof(Queryable),
                        methodName,
                        new[] { typeof(T), body.Type },
                        query.Expression,
                        Expression.Lambda(body, param),
                        Expression.Constant(comparer)
                    )
                )
                : (IOrderedQueryable<T>)query.Provider.CreateQuery(
                    Expression.Call(
                        typeof(Queryable),
                        methodName,
                        new[] { typeof(T), body.Type },
                        query.Expression,
                        Expression.Lambda(body, param)
                    )
                );
        }

protected void EnableDynamicVisiting()
        {
            if (dynamicVisit != null)
                return;

            Type returnType = typeof(T);
            ParameterExpression exprParam = Expression.Parameter(typeof(Expression), "node");
            Expression body = Expression.Call(Expression.Constant(this), nameof(DefaultVisit), null, exprParam);

            foreach (MethodInfo method in this.GetType().GetTypeInfo().DeclaredMethods)
            {
                if (method.ReturnType != returnType || !method.Name.StartsWith("Visit"))
                    continue;

                ParameterInfo[] parameters = method.GetParameters();

                if (parameters.Length != 1)
                    continue;

                ParameterInfo parameter = parameters[0];

                if (!parameter.ParameterType.IsreplacedignableTo(typeof(Expression)))
                    continue;

                // We got this far, it's a valid Visit*() method.
                ParameterExpression exprVar = Expression.Parameter(parameter.ParameterType, parameter.Name);

                // expr is TExpr newExpr ? newExpr : body
                body = Expression.Block(new[] { exprVar },
                    Expression.replacedign(exprVar, Expression.TypeAs(exprParam, parameter.ParameterType)),
                    Expression.Condition(
                        Expression.ReferenceNotEqual(exprVar, Expression.Constant(null)),
                        exprVar,
                        body
                    )
                );
            }

            dynamicVisit = Expression.Lambda<Func<Expression, T>>(body, exprParam).Compile();
        }

public override Action<T, object> CreateSet<T>(FieldInfo fieldInfo)
        {
            ValidationUtils.ArgumentNotNull(fieldInfo, nameof(fieldInfo));

            // use reflection for structs
            // expression doesn't correctly set value
            if (fieldInfo.DeclaringType.IsValueType() || fieldInfo.IsInitOnly)
            {
                return LateBoundReflectionDelegateFactory.Instance.CreateSet<T>(fieldInfo);
            }

            ParameterExpression sourceParameterExpression = Expression.Parameter(typeof(T), "source");
            ParameterExpression valueParameterExpression = Expression.Parameter(typeof(object), "value");

            Expression fieldExpression;
            if (fieldInfo.IsStatic)
            {
                fieldExpression = Expression.Field(null, fieldInfo);
            }
            else
            {
                Expression sourceExpression = EnsureCastExpression(sourceParameterExpression, fieldInfo.DeclaringType);

                fieldExpression = Expression.Field(sourceExpression, fieldInfo);
            }

            Expression valueExpression = EnsureCastExpression(valueParameterExpression, fieldExpression.Type);

            BinaryExpression replacedignExpression = Expression.replacedign(fieldExpression, valueExpression);

            LambdaExpression lambdaExpression = Expression.Lambda(typeof(Action<T, object>), replacedignExpression, sourceParameterExpression, valueParameterExpression);

            Action<T, object> compiled = (Action<T, object>)lambdaExpression.Compile();
            return compiled;
        }

public static object Deserialize(Type type, ref BssomReader reader, ref BssomDeserializeContext context)
        {
            object formatter = context.Option.FormatterResolver.GetFormatterWithVerify(type);

            if (!DeserializerDelegates.TryGetValue(type, out DeserializeMethod deserializerDelegate))
            {
                Type formatterType = typeof(IBssomFormatter<>).MakeGenericType(type);
                ParameterExpression param0 = Expression.Parameter(typeof(object), "formatter");
                ParameterExpression param1 = Expression.Parameter(typeof(BssomReader).MakeByRefType(), "reader");
                ParameterExpression param2 = Expression.Parameter(typeof(BssomDeserializeContext).MakeByRefType(), "context");

                MethodInfo deserializeMethod = formatterType.GetRuntimeMethod(nameof(Deserialize), new[] { typeof(BssomReader).MakeByRefType(), typeof(BssomDeserializeContext).MakeByRefType() });

                //(object)IBssomFormatter<T>.Deserialize(ref reader,option);
                UnaryExpression body = Expression.Convert(Expression.Call(
                    Expression.Convert(param0, formatterType),
                    deserializeMethod,
                    param1,
                    param2), typeof(object));

                deserializerDelegate = Expression.Lambda<DeserializeMethod>(body, param0, param1, param2).Compile();
                DeserializerDelegates.TryAdd(type, deserializerDelegate);
            }

            return deserializerDelegate(formatter, ref reader, ref context);
        }

private DynamicMetaObject BuildCallMethodWithResult(string methodName, DynamicMetaObjectBinder binder, Expression[] args, DynamicMetaObject fallbackResult, Fallback fallbackInvoke)
        {
            //
            // Build a new expression like:
            // {
            //   object result;
            //   TryGetMember(payload, out result) ? fallbackInvoke(result) : fallbackResult
            // }
            //
            ParameterExpression result = Expression.Parameter(typeof(object), null);

            IList<Expression> callArgs = new List<Expression>();
            callArgs.Add(Expression.Convert(Expression, typeof(T)));
            callArgs.Add(Constant(binder));
            callArgs.AddRange(args);
            callArgs.Add(result);

            DynamicMetaObject resultMetaObject = new DynamicMetaObject(result, BindingRestrictions.Empty);

            // Need to add a conversion if calling TryConvert
            if (binder.ReturnType != typeof(object))
            {
                UnaryExpression convert = Expression.Convert(resultMetaObject.Expression, binder.ReturnType);
                // will always be a cast or unbox

                resultMetaObject = new DynamicMetaObject(convert, resultMetaObject.Restrictions);
            }

            if (fallbackInvoke != null)
            {
                resultMetaObject = fallbackInvoke(resultMetaObject);
            }

            DynamicMetaObject callDynamic = new DynamicMetaObject(
                Expression.Block(
                    new[] { result },
                    Expression.Condition(
                        Expression.Call(
                            Expression.Constant(_proxy),
                            typeof(DynamicProxy<T>).GetMethod(methodName),
                            callArgs
                            ),
                        resultMetaObject.Expression,
                        fallbackResult.Expression,
                        binder.ReturnType
                        )
                    ),
                GetRestrictions().Merge(resultMetaObject.Restrictions).Merge(fallbackResult.Restrictions)
                );

            return callDynamic;
        }

[Fact]
        public void ShouldRespectWhile()
        {
            ParameterExpression nbr = Expression.Variable(typeof(int), nameof(nbr));
            ParameterExpression output = Expression.Parameter(typeof(List<int>), "output");

            List<int> addedItems = new List<int>();

            WhileExpression loop = X.While(
                Expression.LessThan(Expression.PostIncrementreplacedign(nbr), Expression.Constant(10)),
                Expression.Call(output, nameof(List<int>.Add), null, nbr)
            );

            Expression
                .Lambda<Action<List<int>>>(Expression.Block(new[] { nbr }, loop), output)
                .Compile()(addedItems);

            addedItems.Count.ShouldBe(10);

            int index = 0;
            while (index++ < 10)
                addedItems[index - 1].ShouldBe(index);
        }

public override Func<T, object> CreateGet<T>(PropertyInfo propertyInfo)
        {
            ValidationUtils.ArgumentNotNull(propertyInfo, nameof(propertyInfo));

            Type instanceType = typeof(T);
            Type resultType = typeof(object);

            ParameterExpression parameterExpression = Expression.Parameter(instanceType, "instance");
            Expression resultExpression;

            MethodInfo getMethod = propertyInfo.GetGetMethod(true);

            if (getMethod.IsStatic)
            {
                resultExpression = Expression.MakeMemberAccess(null, propertyInfo);
            }
            else
            {
                Expression readParameter = EnsureCastExpression(parameterExpression, propertyInfo.DeclaringType);

                resultExpression = Expression.MakeMemberAccess(readParameter, propertyInfo);
            }

            resultExpression = EnsureCastExpression(resultExpression, resultType);

            LambdaExpression lambdaExpression = Expression.Lambda(typeof(Func<T, object>), resultExpression, parameterExpression);

            Func<T, object> compiled = (Func<T, object>)lambdaExpression.Compile();
            return compiled;
        }

static Func<Dictionary<string, string>, T> CompileDeserializer()
        {
            var o_t = typeof(T);
            var o_ctor = o_t.GetConstructor(new[] { typeof(SerializationInfo), typeof(StreamingContext) });

            var d_t = typeof(Dictionary<string, string>);
            var d = Expression.Parameter(d_t, "d");
            var d_mi_get_enumerator = d_t.GetMethod("GetEnumerator");

            var fc_t = typeof(IFormatterConverter);// typeof(LocalVariableInfo);
            var fc = Expression.Variable(fc_t, "fc");
            var fc_init = Expression.MemberInit(Expression.New(typeof(System.Runtime.Serialization.FormatterConverter))); //Expression.MemberInit(Expression.New(fc_t));

            var info_t = typeof(SerializationInfo);
            var info = Expression.Variable(info_t, "info");
            var info_ctor = info_t.GetConstructor(new[] { typeof(Type), fc_t });
            var info_init = Expression.MemberInit(Expression.New(info_ctor, Expression.Constant(o_t), fc));
            var info_mi_add_value = info_t.GetMethod("AddValue", new[] { typeof(String), typeof(Object) });

            var ctx_t = typeof(StreamingContext);
            var ctx = Expression.Variable(ctx_t, "ctx");
            var ctx_init = Expression.MemberInit(Expression.New(ctx_t));

            var enumerator_t = typeof(Dictionary<string, string>.Enumerator);
            var enumerator = Expression.Variable(enumerator_t, "enumerator");
            var enumerator_mi_move_next = enumerator_t.GetMethod("MoveNext");
            var enumerator_current = Expression.Property(enumerator, "Current");

            var kvp_t = typeof(KeyValuePair<string, string>);
            var kvp_pi_key = kvp_t.GetProperty("Key");
            var kvp_pi_value = kvp_t.GetProperty("Value");

            var exit_loop = Expression.Label("exit_loop");

            var body = Expression.Block(new[] { fc, info, ctx, enumerator },
                Expression.replacedign(fc, fc_init),
                Expression.replacedign(info, info_init),
                Expression.replacedign(ctx, ctx_init),
                Expression.replacedign(enumerator, Expression.Call(d, d_mi_get_enumerator)),

                Expression.Loop(
                    Expression.IfThenElse(
                        Expression.Call(enumerator, enumerator_mi_move_next),
                        Expression.Call(info, info_mi_add_value, Expression.Property(enumerator_current, kvp_pi_key), Expression.Property(enumerator_current, kvp_pi_value)),
                        Expression.Break(exit_loop)),
                    exit_loop),

                Expression.MemberInit(Expression.New(o_ctor, info, ctx))
            );

            return Expression.Lambda<Func<Dictionary<string, string>, T>>(body, d)
                .Compile();
        }

public override MethodCall<T, object> CreateMethodCall<T>(MethodBase method)
        {
            ValidationUtils.ArgumentNotNull(method, nameof(method));

            Type type = typeof(object);

            ParameterExpression targetParameterExpression = Expression.Parameter(type, "target");
            ParameterExpression argsParameterExpression = Expression.Parameter(typeof(object[]), "args");

            Expression callExpression = BuildMethodCall(method, type, targetParameterExpression, argsParameterExpression);

            LambdaExpression lambdaExpression = Expression.Lambda(typeof(MethodCall<T, object>), callExpression, targetParameterExpression, argsParameterExpression);

            MethodCall<T, object> compiled = (MethodCall<T, object>)lambdaExpression.Compile();
            return compiled;
        }

private static Action<T> GetCompiledSetter(Expression<Func<T>> lambda)
        {
            ParameterExpression parameter = Parameter(typeof(T), "value");

            return Lambda<Action<T>>(replacedign(lambda.Body, parameter), parameter).Compile();
        }

private DynamicMetaObject BuildCallMethodWithResult<TBinder> (MethodInfo method, TBinder binder, Expression[] args, DynamicMetaObject fallbackResult, Fallback<TBinder> fallbackInvoke)
				where TBinder : DynamicMetaObjectBinder
			{
				if (!IsOverridden (method))
				{
					return fallbackResult;
				}

				//
				// Build a new expression like:
				// {
				//   object result;
				//   TryGetMember(payload, out result) ? fallbackInvoke(result) : fallbackResult
				// }
				//
				ParameterExpression result = Expression.Parameter (typeof (object), null);
				ParameterExpression callArgs = method != DynamicObject_TryBinaryOperation ? Expression.Parameter (typeof (object[]), null) : Expression.Parameter (typeof (object), null);
				ReadOnlyCollection<Expression> callArgsValue = GetConvertedArgs (args);

				var resultMO = new DynamicMetaObject (result, BindingRestrictions.Empty);

				// Need to add a conversion if calling TryConvert
				if (binder.ReturnType != typeof (object))
				{
					Debug.replacedert (binder is ConvertBinder && fallbackInvoke == null);

					UnaryExpression convert = Expression.Convert (resultMO.Expression, binder.ReturnType);
					// will always be a cast or unbox
					Debug.replacedert (convert.Method == null);


					// Prepare a good exception message in case the convert will fail
					// JJA - we don't have access to the Strings type:
					//string convertFailed = System.Linq.Expressions.Strings.DynamicObjectResultNotreplacedignable (
					//	"{0}",
					//	this.Value.GetType(),
					//	binder.GetType(),
					//	binder.ReturnType
					//);				
					string convertFailed = $"Dynamic conversion failed: Could not convert type '{Value.WrappedType}' to '{binder.ReturnType}'.";

					Expression condition;
					// If the return type can not be replacedigned null then just check for type replacedignability otherwise allow null.
					if (binder.ReturnType.IsValueType && Nullable.GetUnderlyingType (binder.ReturnType) == null)
					{
						condition = Expression.TypeIs (resultMO.Expression, binder.ReturnType);
					}
					else
					{
						condition = Expression.OrElse (
										Expression.Equal (resultMO.Expression, AstUtils.Null),
										Expression.TypeIs (resultMO.Expression, binder.ReturnType));
					}

					Expression checkedConvert = Expression.Condition (
						condition,
						convert,
						Expression.Throw (
							Expression.New (
								InvalidCastException_Ctor_String,
								new TrueReadOnlyCollection<Expression> (
									Expression.Call (
										String_Format_String_ObjectArray,
										Expression.Constant (convertFailed),
										Expression.NewArrayInit (
											typeof (object),
											new TrueReadOnlyCollection<Expression> (
												Expression.Condition (
													Expression.Equal (resultMO.Expression, AstUtils.Null),
													Expression.Constant ("null"),
													Expression.Call (
														resultMO.Expression,
														Object_GetType
													),
													typeof (object)
												)
											)
										)
									)
								)
							),
							binder.ReturnType
						),
						binder.ReturnType
					);

					resultMO = new DynamicMetaObject (checkedConvert, resultMO.Restrictions);
				}

				if (fallbackInvoke != null)
				{
					resultMO = fallbackInvoke (this, binder, resultMO);
				}

				var callDynamic = new DynamicMetaObject (
					Expression.Block (
						new TrueReadOnlyCollection<ParameterExpression> (result, callArgs),
						new TrueReadOnlyCollection<Expression> (
							method != DynamicObject_TryBinaryOperation ? Expression.replacedign (callArgs, Expression.NewArrayInit (typeof (object), callArgsValue)) : Expression.replacedign (callArgs, callArgsValue[0]),
							Expression.Condition (
								Expression.Call (
									GetLimitedSelf (),
									method,
									BuildCallArgs (
										binder,
										method.Name == "TryInvokeMember", // JJA
										args,
										callArgs,
										result
									)
								),
								Expression.Block (
									method != DynamicObject_TryBinaryOperation ? ReferenceArgreplacedign (callArgs, args) : AstUtils.Empty,
									resultMO.Expression
								),
								fallbackResult.Expression,
								binder.ReturnType
							)
						)
					),
					GetRestrictions ().Merge (resultMO.Restrictions).Merge (fallbackResult.Restrictions)
				);
				return callDynamic;
			}

public void Serialize(ref BssomWriter writer, ref BssomSerializeContext context, object value)
        {
            if (value == null)
            {
                writer.WriteNull();
                return;
            }

            Type realType = value.GetType();
            if (realType == typeof(object))
            {
                writer.WriteArray1BuildInType(BssomType.Map2);
                BssMapObjMarshal.WriteEmptyMapObject(ref writer);
                return;
            }

            object formatter = context.Option.FormatterResolver.GetFormatterWithVerify(realType);

            if (!SerializerDelegates.TryGetValue(realType, out SerializeMethod serializerDelegate))
            {
                Type formatterType = typeof(IBssomFormatter<>).MakeGenericType(realType);
                ParameterExpression param0 = Expression.Parameter(typeof(object), "formatter");
                ParameterExpression param1 = Expression.Parameter(typeof(BssomWriter).MakeByRefType(), "writer");
                ParameterExpression param2 = Expression.Parameter(typeof(BssomSerializeContext).MakeByRefType(), "context");
                ParameterExpression param3 = Expression.Parameter(typeof(object), "value");

                MethodInfo serializeMethod = formatterType.GetRuntimeMethod(nameof(Serialize), new[] { typeof(BssomWriter).MakeByRefType(), typeof(BssomSerializeContext).MakeByRefType(), realType });

                MethodCallExpression body = Expression.Call(
                    Expression.Convert(param0, formatterType),
                    serializeMethod,
                    param1, param2,
                    realType.IsValueType ? Expression.Unbox(param3, realType) : Expression.Convert(param3, realType)
                    );

                serializerDelegate = Expression.Lambda<SerializeMethod>(body, param0, param1, param2, param3).Compile();
                SerializerDelegates.TryAdd(realType, serializerDelegate);
            }

            serializerDelegate(formatter, ref writer, ref context, value);

        }

private DynamicMetaObject CallMethodNoResult<TBinder> (MethodInfo method, TBinder binder, Expression[] args, Fallback<TBinder> fallback)
				where TBinder : DynamicMetaObjectBinder
			{
				//
				// First, call fallback to do default binding
				// This produces either an error or a call to a .NET member
				//
				DynamicMetaObject fallbackResult = fallback (this, binder, null);
				ParameterExpression callArgs = Expression.Parameter (typeof (object[]), null);
				ReadOnlyCollection<Expression> callArgsValue = GetConvertedArgs (args);

				//
				// Build a new expression like:
				//   if (TryDeleteMember(payload)) { } else { fallbackResult }
				//
				var callDynamic = new DynamicMetaObject (
					Expression.Block (
						new TrueReadOnlyCollection<ParameterExpression> (callArgs),
						new TrueReadOnlyCollection<Expression> (
							Expression.replacedign (callArgs, Expression.NewArrayInit (typeof (object), callArgsValue)),
							Expression.Condition (
								Expression.Call (
									GetLimitedSelf (),
									method,
									BuildCallArgs (
										binder,
										method.Name == "TryInvokeMember", // JJA
										args,
										callArgs,
										null
									)
								),
								Expression.Block (
									ReferenceArgreplacedign (callArgs, args),
									AstUtils.Empty
								),
								fallbackResult.Expression,
								typeof (void)
							)
						)
					),
					GetRestrictions ().Merge (fallbackResult.Restrictions)
				);

				//
				// Now, call fallback again using our new MO as the error
				// When we do this, one of two things can happen:
				//   1. Binding will succeed, and it will ignore our call to
				//      the dynamic method, OR
				//   2. Binding will fail, and it will use the MO we created
				//      above.
				//
				return fallback (this, binder, callDynamic);
			}

[Fact]
        public void ShouldIterateEnumerable()
        {
            ParameterExpression output = Expression.Parameter(typeof(List<string>), "output");
            ParameterExpression item = Expression.Variable(typeof(string), "item");
            ConstantExpression items = Expression.Constant(Enumerable.Repeat("hello world", 10));

            List<string> addedItems = new List<string>();

            ForEachExpression loop = X.ForEach(item, items,
                Expression.Call(output, nameof(List<string>.Add), null, item)
            );

            Expression
                .Lambda<Action<List<string>>>(loop, output)
                .Compile()(addedItems);

            addedItems.Count.ShouldBe(10);
            addedItems[0].ShouldBe("hello world");
        }

async public static Task<bool> Use(HttpContext context, IFreeSql fsql, string requestPathBase, Dictionary<string, Type> dicEnreplacedyTypes) {
			HttpRequest req = context.Request;
			HttpResponse res = context.Response;

			var remUrl = req.Path.ToString().Substring(requestPathBase.Length).Trim(' ', '/').Split('/');
			var enreplacedyName = remUrl.FirstOrDefault();

			if (!string.IsNullOrEmpty(enreplacedyName)) {

				if (dicEnreplacedyTypes.TryGetValue(enreplacedyName, out var enreplacedyType) == false) throw new Exception($"UseFreeAdminLtePreview 错误，找不到实体类型：{enreplacedyName}");

				var tb = fsql.CodeFirst.GetTableByEnreplacedy(enreplacedyType);
				if (tb == null) throw new Exception($"UseFreeAdminLtePreview 错误，实体类型无法映射：{enreplacedyType.FullName}");

				var tpl = _tpl.Value;

				switch (remUrl.ElementAtOrDefault(1)?.ToLower()) {
					case null:
						//首页
						if (true) {
							MakeTemplateFile($"{enreplacedyName}-list.html", Views.List);

							//ManyToOne/OneToOne
							var getlistFilter = new List<(TableRef, string, string, Dictionary<string, object>, List<Dictionary<string, object>>)>();
							foreach (var prop in tb.Properties) {
								if (tb.ColumnsByCs.ContainsKey(prop.Key)) continue;
								var tbref = tb.GetTableRef(prop.Key, false);
								if (tbref == null) continue;
								switch (tbref.RefType) {
									case TableRefType.OneToMany: continue;
									case TableRefType.ManyToOne:
										getlistFilter.Add(await Utils.GetTableRefData(fsql, tbref));
										continue;
									case TableRefType.OneToOne:
										continue;
									case TableRefType.ManyToMany:
										getlistFilter.Add(await Utils.GetTableRefData(fsql, tbref));
										continue;
								}
							}

							int.TryParse(req.Query["page"].FirstOrDefault(), out var getpage);
							int.TryParse(req.Query["limit"].FirstOrDefault(), out var getlimit);
							if (getpage <= 0) getpage = 1;
							if (getlimit <= 0) getlimit = 20;

							var getselect = fsql.Select<object>().AsType(enreplacedyType);
							foreach (var getlistF in getlistFilter) {
								var qv = req.Query[getlistF.Item3].ToArray();
								if (qv.Any()) {
									switch (getlistF.Item1.RefType) {
										case TableRefType.OneToMany: continue;
										case TableRefType.ManyToOne:
											getselect.Where(Utils.GetObjectWhereExpressionContains(tb, enreplacedyType, getlistF.Item1.Columns[0].CsName, qv));
											continue;
										case TableRefType.OneToOne:
											continue;
										case TableRefType.ManyToMany:
											if (true) {
												var midType = getlistF.Item1.RefMiddleEnreplacedyType;
												var midTb = fsql.CodeFirst.GetTableByEnreplacedy(midType);
												var midISelect = typeof(ISelect<>).MakeGenericType(midType);

												var funcType = typeof(Func<,>).MakeGenericType(typeof(object), typeof(bool));
												var expParam = Expression.Parameter(typeof(object), "a");
												var midParam = Expression.Parameter(midType, "mdtp");

												var anyMethod = midISelect.GetMethod("Any");
												var selectExp = qv.Select(c => Expression.Convert(Expression.Constant(FreeSql.Internal.Utils.GetDataReaderValue(getlistF.Item1.MiddleColumns[1].CsType, c)), getlistF.Item1.MiddleColumns[1].CsType)).ToArray();
												var expLambad = Expression.Lambda<Func<object, bool>>(
													Expression.Call(
														Expression.Call(
															Expression.Call(
																Expression.Constant(fsql),
																typeof(IFreeSql).GetMethod("Select", new Type[0]).MakeGenericMethod(midType)
															),
															midISelect.GetMethod("Where", new[] { typeof(Expression<>).MakeGenericType(typeof(Func<,>).MakeGenericType(midType, typeof(bool))) }),
															Expression.Lambda(
																typeof(Func<,>).MakeGenericType(midType, typeof(bool)),
																Expression.AndAlso(
																	Expression.Equal(
																		Expression.MakeMemberAccess(Expression.TypeAs(expParam, enreplacedyType), tb.Properties[getlistF.Item1.Columns[0].CsName]),
																		Expression.MakeMemberAccess(midParam, midTb.Properties[getlistF.Item1.MiddleColumns[0].CsName])
																	),
																	Expression.Call(
																		Utils.GetLinqContains(getlistF.Item1.MiddleColumns[1].CsType),
																		Expression.NewArrayInit(
																			getlistF.Item1.MiddleColumns[1].CsType,
																			selectExp
																		),
																		Expression.MakeMemberAccess(midParam, midTb.Properties[getlistF.Item1.MiddleColumns[1].CsName])
																	)
																),
																midParam
															)
														),
														anyMethod,
														Expression.Default(anyMethod.GetParameters().FirstOrDefault().ParameterType)
													),
													expParam);

												getselect.Where(expLambad);
											}
											continue;
									}
								}
							}

							var getlistTotal = await getselect.CountAsync();
							var getlist = await getselect.Page(getpage, getlimit).ToListAsync();
							var gethashlists = new Dictionary<string, object>[getlist.Count];
							var gethashlistsIndex = 0;
							foreach (var getlisreplacedem in getlist) {
								var gethashlist = new Dictionary<string, object>();
								foreach (var getcol in tb.ColumnsByCs) {
									gethashlist.Add(getcol.Key, tb.Properties[getcol.Key].GetValue(getlisreplacedem));
								}
								gethashlists[gethashlistsIndex++] = gethashlist;
							}

							var options = new Dictionary<string, object>();
							options["tb"] = tb;
							options["getlist"] = gethashlists;
							options["getlistTotal"] = getlistTotal;
							options["getlistFilter"] = getlistFilter;
							var str = _tpl.Value.RenderFile($"{enreplacedyName}-list.html", options);
							await res.WriteAsync(str);
						}
						return true;
					case "add":
					case "edit":
						//编辑页
						object gereplacedem = null;
						Dictionary<string, object> gethash = null;
						if (req.Query.Any()) {
							gereplacedem = Activator.CreateInstance(enreplacedyType);
							foreach (var getpk in tb.Primarys) {
								var reqv = req.Query[getpk.CsName].ToArray();
								if (reqv.Any())
									fsql.SetEnreplacedyValueWithPropertyName(enreplacedyType, gereplacedem, getpk.CsName, reqv.Length == 1 ? (object)reqv.FirstOrDefault() : reqv);
							}
							gereplacedem = await fsql.Select<object>().AsType(enreplacedyType).WhereDynamic(gereplacedem).FirstAsync();
							if (gereplacedem != null) {
								gethash = new Dictionary<string, object>();
								foreach (var getcol in tb.ColumnsByCs) {
									gethash.Add(getcol.Key, tb.Properties[getcol.Key].GetValue(gereplacedem));
								}
							}
						}

						if (req.Method.ToLower() == "get") {
							MakeTemplateFile($"{enreplacedyName}-edit.html", Views.Edit);

							//ManyToOne/OneToOne
							var getlistFilter = new Dictionary<string, (TableRef, string, string, Dictionary<string, object>, List<Dictionary<string, object>>)>();
							var getlistManyed = new Dictionary<string, IEnumerable<string>>();
							foreach (var prop in tb.Properties) {
								if (tb.ColumnsByCs.ContainsKey(prop.Key)) continue;
								var tbref = tb.GetTableRef(prop.Key, false);
								if (tbref == null) continue;
								switch (tbref.RefType) {
									case TableRefType.OneToMany: continue;
									case TableRefType.ManyToOne:
										getlistFilter.Add(prop.Key, await Utils.GetTableRefData(fsql, tbref));
										continue;
									case TableRefType.OneToOne:
										continue;
									case TableRefType.ManyToMany:
										getlistFilter.Add(prop.Key, await Utils.GetTableRefData(fsql, tbref));

										if (gereplacedem != null) {
											var midType = tbref.RefMiddleEnreplacedyType;
											var midTb = fsql.CodeFirst.GetTableByEnreplacedy(midType);
											var manyed = await fsql.Select<object>().AsType(midType)
												.Where(Utils.GetObjectWhereExpression(midTb, midType, tbref.MiddleColumns[0].CsName, fsql.GetEnreplacedyKeyValues(enreplacedyType, gereplacedem)[0]))
												.ToListAsync();
											getlistManyed.Add(prop.Key, manyed.Select(a => fsql.GetEnreplacedyValueWithPropertyName(midType, a, tbref.MiddleColumns[1].CsName).ToString()));
										}
										continue;
								}
							}

							var options = new Dictionary<string, object>();
							options["tb"] = tb;
							options["gethash"] = gethash;
							options["getlistFilter"] = getlistFilter;
							options["getlistManyed"] = getlistManyed;
							options["postaction"] = $"{requestPathBase}restful-api/{enreplacedyName}";
							var str = _tpl.Value.RenderFile($"{enreplacedyName}-edit.html", options);
							await res.WriteAsync(str);

						} else {
							if (gereplacedem == null) {
								gereplacedem = Activator.CreateInstance(enreplacedyType);
								foreach(var getcol in tb.Columns.Values) {
									if (new[] { typeof(DateTime), typeof(DateTime?) }.Contains(getcol.CsType) && new[] { "create_time", "createtime" }.Contains(getcol.CsName.ToLower()))
										fsql.SetEnreplacedyValueWithPropertyName(enreplacedyType, gereplacedem, getcol.CsName, DateTime.Now);
								}
							}
							var manySave = new List<(TableRef, object[], List<object>)>();
							if (req.Form.Any()) {
								foreach(var getcol in tb.Columns.Values) {
									if (new[] { typeof(DateTime), typeof(DateTime?) }.Contains(getcol.CsType) && new[] { "update_time", "updatetime" }.Contains(getcol.CsName.ToLower()))
										fsql.SetEnreplacedyValueWithPropertyName(enreplacedyType, gereplacedem, getcol.CsName, DateTime.Now);

									var reqv = req.Form[getcol.CsName].ToArray();
									if (reqv.Any())
										fsql.SetEnreplacedyValueWithPropertyName(enreplacedyType, gereplacedem, getcol.CsName, reqv.Length == 1 ? (object)reqv.FirstOrDefault() : reqv);
								}
								//ManyToMany
								foreach (var prop in tb.Properties) {
									if (tb.ColumnsByCs.ContainsKey(prop.Key)) continue;
									var tbref = tb.GetTableRef(prop.Key, false);
									if (tbref == null) continue;
									switch (tbref.RefType) {
										case TableRefType.OneToMany: continue;
										case TableRefType.ManyToOne:
											continue;
										case TableRefType.OneToOne:
											continue;
										case TableRefType.ManyToMany:
											var midType = tbref.RefMiddleEnreplacedyType;
											var mtb = fsql.CodeFirst.GetTableByEnreplacedy(midType);

											var reqv = req.Form[$"mn_{prop.Key}"].ToArray();
											var reqvIndex = 0;
											var manyVals = new object[reqv.Length];
											foreach (var rv in reqv) {
												var miditem = Activator.CreateInstance(midType);
												foreach (var getcol in tb.Columns.Values) {
													if (new[] { typeof(DateTime), typeof(DateTime?) }.Contains(getcol.CsType) && new[] { "create_time", "createtime" }.Contains(getcol.CsName.ToLower()))
														fsql.SetEnreplacedyValueWithPropertyName(midType, miditem, getcol.CsName, DateTime.Now);

													if (new[] { typeof(DateTime), typeof(DateTime?) }.Contains(getcol.CsType) && new[] { "update_time", "updatetime" }.Contains(getcol.CsName.ToLower()))
														fsql.SetEnreplacedyValueWithPropertyName(midType, miditem, getcol.CsName, DateTime.Now);
												}
												//fsql.SetEnreplacedyValueWithPropertyName(midType, miditem, tbref.MiddleColumns[0].CsName, fsql.GetEnreplacedyKeyValues(enreplacedyType, gereplacedem)[0]);
												fsql.SetEnreplacedyValueWithPropertyName(midType, miditem, tbref.MiddleColumns[1].CsName, rv);
												manyVals[reqvIndex++] = miditem;
											}
											var molds = await fsql.Select<object>().AsType(midType).Where(Utils.GetObjectWhereExpression(mtb, midType, tbref.MiddleColumns[0].CsName, fsql.GetEnreplacedyKeyValues(enreplacedyType, gereplacedem)[0])).ToListAsync();
											manySave.Add((tbref, manyVals, molds));
											continue;
									}
								}
							}


							using (var db = fsql.CreateDbContext()) {

								var dbset = db.Set<object>();
								dbset.AsType(enreplacedyType);

								await dbset.AddOrUpdateAsync(gereplacedem);

								foreach (var ms in manySave) {
									var midType = ms.Item1.RefMiddleEnreplacedyType;
									var moldsDic = ms.Item3.ToDictionary(a => fsql.GetEnreplacedyKeyString(midType, a, true));

									var manyset = db.Set<object>();
									manyset.AsType(midType);
									
									foreach (var msVal in ms.Item2) {
										fsql.SetEnreplacedyValueWithPropertyName(midType, msVal, ms.Item1.MiddleColumns[0].CsName, fsql.GetEnreplacedyKeyValues(enreplacedyType, gereplacedem)[0]);
										await manyset.AddOrUpdateAsync(msVal);
										moldsDic.Remove(fsql.GetEnreplacedyKeyString(midType, msVal, true));
									}
									manyset.RemoveRange(moldsDic.Values);
								}

								await db.SaveChangesAsync();
							}
							gethash = new Dictionary<string, object>();
							foreach (var getcol in tb.ColumnsByCs) {
								gethash.Add(getcol.Key, tb.Properties[getcol.Key].GetValue(gereplacedem));
							}

							await Utils.Jsonp(context, new { code = 0, success = true, message = "Success", data = gethash });
						}
						return true;
					case "del":
						if (req.Method.ToLower() == "post") {

							var delitems = new List<object>();
							var reqv = new List<string[]>();
							foreach(var delpk in tb.Primarys) {
								var reqvs = req.Form[delpk.CsName].ToArray();
								if (reqv.Count > 0 && reqvs.Length != reqv[0].Length) throw new Exception("删除失败，联合主键参数传递不对等");
								reqv.Add(reqvs);
							}
							if (reqv[0].Length == 0) return true;

							using (var ctx = fsql.CreateDbContext()) {
								var dbset = ctx.Set<object>();
								dbset.AsType(enreplacedyType);

								for (var a = 0; a < reqv[0].Length; a++) {
									object delitem = Activator.CreateInstance(enreplacedyType);
									var delpkindex = 0;
									foreach (var delpk in tb.Primarys)
										fsql.SetEnreplacedyValueWithPropertyName(enreplacedyType, delitem, delpk.CsName, reqv[delpkindex++][a]);
									dbset.Remove(delitem);
								}
								await ctx.SaveChangesAsync();
							}

							await Utils.Jsonp(context, new { code = 0, success = true, message = "Success" });
							return true;
						}
						break;
				}
			}
			return false;
		}

public ExpressionContextResult<T> Create<T>(string expression)
        {
            expression = Initialization(expression);
            var parameter = Expression.Parameter(typeof(T), "p");
            var body = CreateExpression(parameter, expression);
            var lambda = Expression.Lambda(body, parameter);
            var func = lambda.Compile() as Func<T, bool>;
            return new ExpressionContextResult<T>()
            {
                Func = func,
                LambdaExpression = lambda
            };
        }

public int Size(ref BssomSizeContext context, object value)
        {
            if (value == null)
            {
                return BssomBinaryPrimitives.NullSize;
            }

            Type realType = value.GetType();
            if (realType == typeof(object))
            {
                return BssMapObjMarshal.Empty.Length + BssomBinaryPrimitives.BuildInTypeCodeSize;
            }

            object formatter = context.Option.FormatterResolver.GetFormatterWithVerify(realType);

            if (!SizeDelegates.TryGetValue(realType, out SizeMethod sizeDelegate))
            {
                Type formatterType = typeof(IBssomFormatter<>).MakeGenericType(realType);
                ParameterExpression param0 = Expression.Parameter(typeof(object), "formatter");
                ParameterExpression param1 = Expression.Parameter(typeof(BssomSizeContext).MakeByRefType(), "context");
                ParameterExpression param2 = Expression.Parameter(typeof(object), "value");

                MethodInfo sizeMethod = formatterType.GetRuntimeMethod(nameof(Size), new[] { typeof(BssomSizeContext).MakeByRefType(), realType });

                MethodCallExpression body = Expression.Call(
                    Expression.Convert(param0, formatterType),
                    sizeMethod, param1,
                    realType.IsValueType ? Expression.Unbox(param2, realType) : Expression.Convert(param2, realType)
                    );

                sizeDelegate = Expression.Lambda<SizeMethod>(body, param0, param1, param2).Compile();
                SizeDelegates.TryAdd(realType, sizeDelegate);
            }

            return sizeDelegate(formatter, ref context, value);
        }

public static IBssomFormatter GetFormatterWithVerify(this IFormatterResolver resolver, Type type)
        {
            if (resolver is null)
            {
                throw new ArgumentNullException(nameof(resolver));
            }

            if (type is null)
            {
                throw new ArgumentNullException(nameof(type));
            }

            if (!FormatterGetters.TryGetValue(type, out Func<IFormatterResolver, IBssomFormatter> formatterGetter))
            {
                MethodInfo genericMethod = GetFormatterMethodInfo.MakeGenericMethod(type);
                ParameterExpression inputResolver = Expression.Parameter(typeof(IFormatterResolver), "inputResolver");
                formatterGetter = Expression.Lambda<Func<IFormatterResolver, IBssomFormatter>>(
                    Expression.Call(inputResolver, genericMethod), inputResolver).Compile();
                FormatterGetters.TryAdd(type, formatterGetter);
            }

            return formatterGetter(resolver);
        }

async public static Task<bool> Use(HttpContext context, IFreeSql fsql, string requestPathBase, Dictionary<string, Type> dicEnreplacedyTypes) {
			HttpRequest req = context.Request;
			HttpResponse res = context.Response;

			var remUrl = req.Path.ToString().Substring(requestPathBase.Length).Trim(' ', '/').Split('/');
			var enreplacedyName = remUrl.FirstOrDefault();

			if (!string.IsNullOrEmpty(enreplacedyName)) {

				if (dicEnreplacedyTypes.TryGetValue(enreplacedyName, out var enreplacedyType) == false) throw new Exception($"UseFreeAdminLtePreview 错误，找不到实体类型：{enreplacedyName}");

				var tb = fsql.CodeFirst.GetTableByEnreplacedy(enreplacedyType);
				if (tb == null) throw new Exception($"UseFreeAdminLtePreview 错误，实体类型无法映射：{enreplacedyType.FullName}");

				var tpl = _tpl.Value;

				switch (remUrl.ElementAtOrDefault(1)?.ToLower()) {
					case null:
						//首页
						if (true) {
							MakeTemplateFile($"{enreplacedyName}-list.html", Views.List);

							//ManyToOne/OneToOne
							var getlistFilter = new List<(TableRef, string, string, Dictionary<string, object>, List<Dictionary<string, object>>)>();
							foreach (var prop in tb.Properties) {
								if (tb.ColumnsByCs.ContainsKey(prop.Key)) continue;
								var tbref = tb.GetTableRef(prop.Key, false);
								if (tbref == null) continue;
								switch (tbref.RefType) {
									case TableRefType.OneToMany: continue;
									case TableRefType.ManyToOne:
										getlistFilter.Add(await Utils.GetTableRefData(fsql, tbref));
										continue;
									case TableRefType.OneToOne:
										continue;
									case TableRefType.ManyToMany:
										getlistFilter.Add(await Utils.GetTableRefData(fsql, tbref));
										continue;
								}
							}

							int.TryParse(req.Query["page"].FirstOrDefault(), out var getpage);
							int.TryParse(req.Query["limit"].FirstOrDefault(), out var getlimit);
							if (getpage <= 0) getpage = 1;
							if (getlimit <= 0) getlimit = 20;

							var getselect = fsql.Select<object>().AsType(enreplacedyType);
							foreach (var getlistF in getlistFilter) {
								var qv = req.Query[getlistF.Item3].ToArray();
								if (qv.Any()) {
									switch (getlistF.Item1.RefType) {
										case TableRefType.OneToMany: continue;
										case TableRefType.ManyToOne:
											getselect.Where(Utils.GetObjectWhereExpressionContains(tb, enreplacedyType, getlistF.Item1.Columns[0].CsName, qv));
											continue;
										case TableRefType.OneToOne:
											continue;
										case TableRefType.ManyToMany:
											if (true) {
												var midType = getlistF.Item1.RefMiddleEnreplacedyType;
												var midTb = fsql.CodeFirst.GetTableByEnreplacedy(midType);
												var midISelect = typeof(ISelect<>).MakeGenericType(midType);

												var funcType = typeof(Func<,>).MakeGenericType(typeof(object), typeof(bool));
												var expParam = Expression.Parameter(typeof(object), "a");
												var midParam = Expression.Parameter(midType, "mdtp");

												var anyMethod = midISelect.GetMethod("Any");
												var selectExp = qv.Select(c => Expression.Convert(Expression.Constant(FreeSql.Internal.Utils.GetDataReaderValue(getlistF.Item1.MiddleColumns[1].CsType, c)), getlistF.Item1.MiddleColumns[1].CsType)).ToArray();
												var expLambad = Expression.Lambda<Func<object, bool>>(
													Expression.Call(
														Expression.Call(
															Expression.Call(
																Expression.Constant(fsql),
																typeof(IFreeSql).GetMethod("Select", new Type[0]).MakeGenericMethod(midType)
															),
															midISelect.GetMethod("Where", new[] { typeof(Expression<>).MakeGenericType(typeof(Func<,>).MakeGenericType(midType, typeof(bool))) }),
															Expression.Lambda(
																typeof(Func<,>).MakeGenericType(midType, typeof(bool)),
																Expression.AndAlso(
																	Expression.Equal(
																		Expression.MakeMemberAccess(Expression.TypeAs(expParam, enreplacedyType), tb.Properties[getlistF.Item1.Columns[0].CsName]),
																		Expression.MakeMemberAccess(midParam, midTb.Properties[getlistF.Item1.MiddleColumns[0].CsName])
																	),
																	Expression.Call(
																		Utils.GetLinqContains(getlistF.Item1.MiddleColumns[1].CsType),
																		Expression.NewArrayInit(
																			getlistF.Item1.MiddleColumns[1].CsType,
																			selectExp
																		),
																		Expression.MakeMemberAccess(midParam, midTb.Properties[getlistF.Item1.MiddleColumns[1].CsName])
																	)
																),
																midParam
															)
														),
														anyMethod,
														Expression.Default(anyMethod.GetParameters().FirstOrDefault().ParameterType)
													),
													expParam);

												getselect.Where(expLambad);
											}
											continue;
									}
								}
							}

							var getlistTotal = await getselect.CountAsync();
							var getlist = await getselect.Page(getpage, getlimit).ToListAsync();
							var gethashlists = new Dictionary<string, object>[getlist.Count];
							var gethashlistsIndex = 0;
							foreach (var getlisreplacedem in getlist) {
								var gethashlist = new Dictionary<string, object>();
								foreach (var getcol in tb.ColumnsByCs) {
									gethashlist.Add(getcol.Key, tb.Properties[getcol.Key].GetValue(getlisreplacedem));
								}
								gethashlists[gethashlistsIndex++] = gethashlist;
							}

							var options = new Dictionary<string, object>();
							options["tb"] = tb;
							options["getlist"] = gethashlists;
							options["getlistTotal"] = getlistTotal;
							options["getlistFilter"] = getlistFilter;
							var str = _tpl.Value.RenderFile($"{enreplacedyName}-list.html", options);
							await res.WriteAsync(str);
						}
						return true;
					case "add":
					case "edit":
						//编辑页
						object gereplacedem = null;
						Dictionary<string, object> gethash = null;
						if (req.Query.Any()) {
							gereplacedem = Activator.CreateInstance(enreplacedyType);
							foreach (var getpk in tb.Primarys) {
								var reqv = req.Query[getpk.CsName].ToArray();
								if (reqv.Any())
									fsql.SetEnreplacedyValueWithPropertyName(enreplacedyType, gereplacedem, getpk.CsName, reqv.Length == 1 ? (object)reqv.FirstOrDefault() : reqv);
							}
							gereplacedem = await fsql.Select<object>().AsType(enreplacedyType).WhereDynamic(gereplacedem).FirstAsync();
							if (gereplacedem != null) {
								gethash = new Dictionary<string, object>();
								foreach (var getcol in tb.ColumnsByCs) {
									gethash.Add(getcol.Key, tb.Properties[getcol.Key].GetValue(gereplacedem));
								}
							}
						}

						if (req.Method.ToLower() == "get") {
							MakeTemplateFile($"{enreplacedyName}-edit.html", Views.Edit);

							//ManyToOne/OneToOne
							var getlistFilter = new Dictionary<string, (TableRef, string, string, Dictionary<string, object>, List<Dictionary<string, object>>)>();
							var getlistManyed = new Dictionary<string, IEnumerable<string>>();
							foreach (var prop in tb.Properties) {
								if (tb.ColumnsByCs.ContainsKey(prop.Key)) continue;
								var tbref = tb.GetTableRef(prop.Key, false);
								if (tbref == null) continue;
								switch (tbref.RefType) {
									case TableRefType.OneToMany: continue;
									case TableRefType.ManyToOne:
										getlistFilter.Add(prop.Key, await Utils.GetTableRefData(fsql, tbref));
										continue;
									case TableRefType.OneToOne:
										continue;
									case TableRefType.ManyToMany:
										getlistFilter.Add(prop.Key, await Utils.GetTableRefData(fsql, tbref));

										if (gereplacedem != null) {
											var midType = tbref.RefMiddleEnreplacedyType;
											var midTb = fsql.CodeFirst.GetTableByEnreplacedy(midType);
											var manyed = await fsql.Select<object>().AsType(midType)
												.Where(Utils.GetObjectWhereExpression(midTb, midType, tbref.MiddleColumns[0].CsName, fsql.GetEnreplacedyKeyValues(enreplacedyType, gereplacedem)[0]))
												.ToListAsync();
											getlistManyed.Add(prop.Key, manyed.Select(a => fsql.GetEnreplacedyValueWithPropertyName(midType, a, tbref.MiddleColumns[1].CsName).ToString()));
										}
										continue;
								}
							}

							var options = new Dictionary<string, object>();
							options["tb"] = tb;
							options["gethash"] = gethash;
							options["getlistFilter"] = getlistFilter;
							options["getlistManyed"] = getlistManyed;
							options["postaction"] = $"{requestPathBase}restful-api/{enreplacedyName}";
							var str = _tpl.Value.RenderFile($"{enreplacedyName}-edit.html", options);
							await res.WriteAsync(str);

						} else {
							if (gereplacedem == null) {
								gereplacedem = Activator.CreateInstance(enreplacedyType);
								foreach(var getcol in tb.Columns.Values) {
									if (new[] { typeof(DateTime), typeof(DateTime?) }.Contains(getcol.CsType) && new[] { "create_time", "createtime" }.Contains(getcol.CsName.ToLower()))
										fsql.SetEnreplacedyValueWithPropertyName(enreplacedyType, gereplacedem, getcol.CsName, DateTime.Now);
								}
							}
							var manySave = new List<(TableRef, object[], List<object>)>();
							if (req.Form.Any()) {
								foreach(var getcol in tb.Columns.Values) {
									if (new[] { typeof(DateTime), typeof(DateTime?) }.Contains(getcol.CsType) && new[] { "update_time", "updatetime" }.Contains(getcol.CsName.ToLower()))
										fsql.SetEnreplacedyValueWithPropertyName(enreplacedyType, gereplacedem, getcol.CsName, DateTime.Now);

									var reqv = req.Form[getcol.CsName].ToArray();
									if (reqv.Any())
										fsql.SetEnreplacedyValueWithPropertyName(enreplacedyType, gereplacedem, getcol.CsName, reqv.Length == 1 ? (object)reqv.FirstOrDefault() : reqv);
								}
								//ManyToMany
								foreach (var prop in tb.Properties) {
									if (tb.ColumnsByCs.ContainsKey(prop.Key)) continue;
									var tbref = tb.GetTableRef(prop.Key, false);
									if (tbref == null) continue;
									switch (tbref.RefType) {
										case TableRefType.OneToMany: continue;
										case TableRefType.ManyToOne:
											continue;
										case TableRefType.OneToOne:
											continue;
										case TableRefType.ManyToMany:
											var midType = tbref.RefMiddleEnreplacedyType;
											var mtb = fsql.CodeFirst.GetTableByEnreplacedy(midType);

											var reqv = req.Form[$"mn_{prop.Key}"].ToArray();
											var reqvIndex = 0;
											var manyVals = new object[reqv.Length];
											foreach (var rv in reqv) {
												var miditem = Activator.CreateInstance(midType);
												foreach (var getcol in tb.Columns.Values) {
													if (new[] { typeof(DateTime), typeof(DateTime?) }.Contains(getcol.CsType) && new[] { "create_time", "createtime" }.Contains(getcol.CsName.ToLower()))
														fsql.SetEnreplacedyValueWithPropertyName(midType, miditem, getcol.CsName, DateTime.Now);

													if (new[] { typeof(DateTime), typeof(DateTime?) }.Contains(getcol.CsType) && new[] { "update_time", "updatetime" }.Contains(getcol.CsName.ToLower()))
														fsql.SetEnreplacedyValueWithPropertyName(midType, miditem, getcol.CsName, DateTime.Now);
												}
												//fsql.SetEnreplacedyValueWithPropertyName(midType, miditem, tbref.MiddleColumns[0].CsName, fsql.GetEnreplacedyKeyValues(enreplacedyType, gereplacedem)[0]);
												fsql.SetEnreplacedyValueWithPropertyName(midType, miditem, tbref.MiddleColumns[1].CsName, rv);
												manyVals[reqvIndex++] = miditem;
											}
											var molds = await fsql.Select<object>().AsType(midType).Where(Utils.GetObjectWhereExpression(mtb, midType, tbref.MiddleColumns[0].CsName, fsql.GetEnreplacedyKeyValues(enreplacedyType, gereplacedem)[0])).ToListAsync();
											manySave.Add((tbref, manyVals, molds));
											continue;
									}
								}
							}


							using (var db = fsql.CreateDbContext()) {

								var dbset = db.Set<object>();
								dbset.AsType(enreplacedyType);

								await dbset.AddOrUpdateAsync(gereplacedem);

								foreach (var ms in manySave) {
									var midType = ms.Item1.RefMiddleEnreplacedyType;
									var moldsDic = ms.Item3.ToDictionary(a => fsql.GetEnreplacedyKeyString(midType, a, true));

									var manyset = db.Set<object>();
									manyset.AsType(midType);
									
									foreach (var msVal in ms.Item2) {
										fsql.SetEnreplacedyValueWithPropertyName(midType, msVal, ms.Item1.MiddleColumns[0].CsName, fsql.GetEnreplacedyKeyValues(enreplacedyType, gereplacedem)[0]);
										await manyset.AddOrUpdateAsync(msVal);
										moldsDic.Remove(fsql.GetEnreplacedyKeyString(midType, msVal, true));
									}
									manyset.RemoveRange(moldsDic.Values);
								}

								await db.SaveChangesAsync();
							}
							gethash = new Dictionary<string, object>();
							foreach (var getcol in tb.ColumnsByCs) {
								gethash.Add(getcol.Key, tb.Properties[getcol.Key].GetValue(gereplacedem));
							}

							await Utils.Jsonp(context, new { code = 0, success = true, message = "Success", data = gethash });
						}
						return true;
					case "del":
						if (req.Method.ToLower() == "post") {

							var delitems = new List<object>();
							var reqv = new List<string[]>();
							foreach(var delpk in tb.Primarys) {
								var reqvs = req.Form[delpk.CsName].ToArray();
								if (reqv.Count > 0 && reqvs.Length != reqv[0].Length) throw new Exception("删除失败，联合主键参数传递不对等");
								reqv.Add(reqvs);
							}
							if (reqv[0].Length == 0) return true;

							using (var ctx = fsql.CreateDbContext()) {
								var dbset = ctx.Set<object>();
								dbset.AsType(enreplacedyType);

								for (var a = 0; a < reqv[0].Length; a++) {
									object delitem = Activator.CreateInstance(enreplacedyType);
									var delpkindex = 0;
									foreach (var delpk in tb.Primarys)
										fsql.SetEnreplacedyValueWithPropertyName(enreplacedyType, delitem, delpk.CsName, reqv[delpkindex++][a]);
									dbset.Remove(delitem);
								}
								await ctx.SaveChangesAsync();
							}

							await Utils.Jsonp(context, new { code = 0, success = true, message = "Success" });
							return true;
						}
						break;
				}
			}
			return false;
		}

private static Expression<Func<TParameter, bool>> ContainsPropertyValueEqual<TParameter>(string crmPropertyName, IEnumerable<object> values)
		{
			var parameterType = typeof(TParameter);

			var parameter = Expression.Parameter(parameterType, parameterType.Name.ToLowerInvariant());

			var expression = ContainsPropertyValueEqual(crmPropertyName, values, parameter);

			return Expression.Lambda<Func<TParameter, bool>>(expression, parameter);
		}