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C# BinaryExpression.ToString方法代码示例

本文整理汇总了C#中System.Linq.Expressions.BinaryExpression.ToString方法的典型用法代码示例。如果您正苦于以下问题:C# BinaryExpression.ToString方法的具体用法?C# BinaryExpression.ToString怎么用?C# BinaryExpression.ToString使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在System.Linq.Expressions.BinaryExpression的用法示例。


在下文中一共展示了BinaryExpression.ToString方法的15个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C#代码示例。

示例1: VisitBinary

        protected override Expression VisitBinary(BinaryExpression node)
        {
            Visit(node.Left);
            var left = _expression;
            Visit(node.Right);
            var right = _expression;

            Operator @operator;
            switch (node.NodeType)
            {
                case ExpressionType.And:
                case ExpressionType.AndAlso:
                    @operator = Operator.And;
                    break;
                case ExpressionType.Or:
                case ExpressionType.OrElse:
                    @operator = Operator.Or;
                    break;
                case ExpressionType.ExclusiveOr:
                    @operator = Operator.OperatorXor;
                    break;
                default:
                    throw new NotSupportedException(node.ToString());
            }

            _expression = new OperatorExpression(@operator) { Branches = new[]{left,right}};

            return node;
        }
开发者ID:alex-fomin,项目名称:BLogic,代码行数:29,代码来源:ExpressionTranslator.cs

示例2: VisitBinary

        protected List<Microsoft.Z3.BoolExpr> VisitBinary(BinaryExpression b)
        {
            // Use recursion to generate Z3 constraints for each operand of the binary expression
            // left side -> create a Z3 expression representing the left side
            Expression left = Visit(b.Left);

            // right side -> creat a Z3 expression representing the right side
            Expression right = Visit(b.Right);

            // Put those into a Z3 format
            ExpressionType op = b.NodeType;

            using (Context ctx = new Context())
            {
                if (op == ExpressionType.LessThan)
                {
                    // ctx.MkLt(left, right);
                }

            }

            Console.WriteLine(b.ToString());

            // TODO - return a Z3 expression
            return null;
        }
开发者ID:izmaxx,项目名称:VBADataGenerator,代码行数:26,代码来源:Z3ExprVisitor.cs

示例3: CloseContext

        public void CloseContext(BinaryExpression node)
        {
            if(!_contexts.Any()) return;

            var last = _contexts.Last();
            if (last.ContextKey == node.ToString()) {
                _contexts.Remove(last);
            }
        }
开发者ID:kneeclass,项目名称:Seekit,代码行数:9,代码来源:SubQueryContextManager.cs

示例4: OpenContext

 public void OpenContext(ConvertedExpression expression, BinaryExpression node)
 {
     if (!SupportedMethods.Contains((expression.Equality ?? string.Empty).TrimStart(ExpressionType.Not.ToString().ToCharArray())))
         return;
     _contexts.Add(new SubQueryContext { Target = expression.Target,
                                         ContextKey = node.ToString(),
                                         // ReSharper disable PossibleNullReferenceException
                                         NegateContext = expression.Equality.StartsWith(ExpressionType.Not.ToString())
                                         // ReSharper restore PossibleNullReferenceException
     });
 }
开发者ID:kneeclass,项目名称:Seekit,代码行数:11,代码来源:SubQueryContextManager.cs

示例5: VisitBinary

        /// <summary>
        /// Process binary comparison operators.
        /// </summary>
        /// <param name="expression">
        /// The expression to visit.
        /// </param>
        /// <returns>
        /// The visited expression.
        /// </returns>
        private Expression VisitBinary(BinaryExpression expression)
        {
            if (expression != null)
            {
                // special case for enums, because we send them as strings
                UnaryExpression enumExpression = null;
                ConstantExpression constantExpression = null;
                if (this.CheckEnumExpression(expression, out enumExpression, out constantExpression))
                {
                    this.Visit(this.RewriteEnumExpression(enumExpression, (ConstantExpression)expression.Right, expression.NodeType));            
                }
                // special case concat as it's OData function isn't infix
                else if (expression.NodeType == ExpressionType.Add &&
                    expression.Left.Type == typeof(string) &&
                    expression.Right.Type == typeof(string))
                {
                    //rewrite addition into a call to concat, instead of duplicating generation code.
                    this.Visit(this.RewriteStringAddition(expression));
                }
                else
                {
                    this.filter.Append("(");
                    this.Visit(expression.Left);
                    switch (expression.NodeType)
                    {
                        case ExpressionType.AndAlso:
                            this.filter.Append(" and ");
                            break;
                        case ExpressionType.OrElse:
                            this.filter.Append(" or ");
                            break;
                        case ExpressionType.Equal:
                            this.filter.Append(" eq ");
                            break;
                        case ExpressionType.NotEqual:
                            this.filter.Append(" ne ");
                            break;
                        case ExpressionType.LessThan:
                            this.filter.Append(" lt ");
                            break;
                        case ExpressionType.LessThanOrEqual:
                            this.filter.Append(" le ");
                            break;
                        case ExpressionType.GreaterThan:
                            this.filter.Append(" gt ");
                            break;
                        case ExpressionType.GreaterThanOrEqual:
                            this.filter.Append(" ge ");
                            break;
                        case ExpressionType.Add:
                            this.filter.Append(" add ");
                            break;
                        case ExpressionType.Subtract:
                            this.filter.Append(" sub ");
                            break;
                        case ExpressionType.Multiply:
                            this.filter.Append(" mul ");
                            break;
                        case ExpressionType.Divide:
                            this.filter.Append(" div ");
                            break;
                        case ExpressionType.Modulo:
                            this.filter.Append(" mod ");
                            break;
                        default:
                            throw new NotSupportedException(
                                string.Format(
                                    CultureInfo.InvariantCulture,
                                    Resources.FilterBuildingExpressionVisitor_OperatorUnsupported,
                                    expression.NodeType,
                                    expression.ToString()));
                    }
                    this.Visit(expression.Right);
                    this.filter.Append(")");
                }
            }

            return expression;
        }
开发者ID:v-jiasi,项目名称:azure-mobile-services,代码行数:88,代码来源:FilterBuildingExpressionVisitor.cs

示例6: VisitBinary

 internal override Expression VisitBinary(BinaryExpression b)
 {
     if (ClientType.CheckElementTypeIsEntity(b.Left.Type) || ClientType.CheckElementTypeIsEntity(b.Right.Type)
         || IsCollectionProducingExpression(b.Left) || IsCollectionProducingExpression(b.Right))
     {
         throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjection(this.type, b.ToString()));
     }
     
     return base.VisitBinary(b);
 }
开发者ID:JianwenSun,项目名称:cc,代码行数:10,代码来源:ProjectionAnalyzer.cs

示例7: VisitBinary

        protected override Expression VisitBinary(BinaryExpression b)
        {
            if (b.NodeType == ExpressionType.Coalesce)
            {
                sb.Append("IsNull(");
                Visit(b.Left);
                sb.Append(",");
                Visit(b.Right);
                sb.Append(")");
            }
            else if (b.NodeType == ExpressionType.Equal || b.NodeType == ExpressionType.NotEqual)
            {
                if (b.Left is ConstantExpression)
                {
                    if (b.Right is ConstantExpression)
                        throw new NotSupportedException("NULL == NULL not supported");

                    Field field = GetField(b.Right);

                    sb.Append(Equals(field, ((ConstantExpression)b.Left).Value, b.NodeType == ExpressionType.Equal));
                }
                else if (b.Right is ConstantExpression)
                {
                    Field field = GetField(b.Left);

                    sb.Append(Equals(field, ((ConstantExpression)b.Right).Value, b.NodeType == ExpressionType.Equal));
                }
                else
                    throw new NotSupportedException("Impossible to translate {0}".FormatWith(b.ToString()));
            }
            else
            {
                sb.Append("(");
                this.Visit(b.Left);
                switch (b.NodeType)
                {
                    case ExpressionType.And:
                    case ExpressionType.AndAlso:
                        sb.Append(b.Type.UnNullify() == typeof(bool) ? " AND " : " & ");
                        break;
                    case ExpressionType.Or:
                    case ExpressionType.OrElse:
                        sb.Append(b.Type.UnNullify() == typeof(bool) ? " OR " : " | ");
                        break;
                    case ExpressionType.ExclusiveOr:
                        sb.Append(" ^ ");
                        break;
                    case ExpressionType.LessThan:
                        sb.Append(" < ");
                        break;
                    case ExpressionType.LessThanOrEqual:
                        sb.Append(" <= ");
                        break;
                    case ExpressionType.GreaterThan:
                        sb.Append(" > ");
                        break;
                    case ExpressionType.GreaterThanOrEqual:
                        sb.Append(" >= ");
                        break;

                    case ExpressionType.Add:
                    case ExpressionType.AddChecked:
                        sb.Append(" + ");
                        break;
                    case ExpressionType.Subtract:
                    case ExpressionType.SubtractChecked:
                        sb.Append(" - ");
                        break;
                    case ExpressionType.Multiply:
                    case ExpressionType.MultiplyChecked:
                        sb.Append(" * ");
                        break;
                    case ExpressionType.Divide:
                        sb.Append(" / ");
                        break;
                    case ExpressionType.Modulo:
                        sb.Append(" % ");
                        break;
                    default:
                        throw new NotSupportedException(string.Format("The binary operator {0} is not supported", b.NodeType));
                }
                this.Visit(b.Right);
                sb.Append(")");
            }
            return b;
        }
开发者ID:rondoo,项目名称:framework,代码行数:86,代码来源:UniqueIndex.cs

示例8: VisitBinary

            internal override Expression VisitBinary(BinaryExpression b)
            {
                if (CommonUtil.IsClientType(b.Left.Type) || CommonUtil.IsClientType(b.Right.Type))
                {
                    throw new NotSupportedException(string.Format(CultureInfo.CurrentCulture, SR.ALinqExpressionNotSupportedInProjection, this.type, b.ToString()));
                }

                return base.VisitBinary(b);
            }
开发者ID:huoxudong125,项目名称:azure-sdk-for-net,代码行数:9,代码来源:ProjectionAnalyzer.cs

示例9: ProcessBinaryExpression

        private static CriteriaOperator ProcessBinaryExpression(BinaryExpression expression, ParameterOption option)
        {
            switch (expression.NodeType)
            {
                case ExpressionType.AndAlso:
                    return ProcessAndExpression(expression, option);

                case ExpressionType.OrElse:
                    return ProcessOrExpression(expression, option);

                case ExpressionType.Equal:
                case ExpressionType.NotEqual:
                case ExpressionType.GreaterThan:
                case ExpressionType.GreaterThanOrEqual:
                case ExpressionType.LessThan:
                case ExpressionType.LessThanOrEqual:
                    if (IsMemberExpression(expression.Right))
                        return ProcessMemberExpression(expression, option);
                    else
                        return ProcessSimpleExpression(expression, option);

                default:
                    throw new Exception("Unhandled binary expression: " + expression.NodeType + ", " + expression.ToString());
            }
        }
开发者ID:eolandezhang,项目名称:Diagram,代码行数:25,代码来源:ExpressionProcessor.cs

示例10: VisitBinary

 internal override Expression VisitBinary(BinaryExpression b)
 {
     if ((ClientTypeUtil.TypeOrElementTypeIsEntity(b.Left.Type) || ClientTypeUtil.TypeOrElementTypeIsEntity(b.Right.Type)) || (ProjectionAnalyzer.IsCollectionProducingExpression(b.Left) || ProjectionAnalyzer.IsCollectionProducingExpression(b.Right)))
     {
         throw new NotSupportedException(System.Data.Services.Client.Strings.ALinq_ExpressionNotSupportedInProjection(this.type, b.ToString()));
     }
     return base.VisitBinary(b);
 }
开发者ID:nickchal,项目名称:pash,代码行数:8,代码来源:ProjectionAnalyzer.cs

示例11: VisitBinaryComparison

        // 
        // Listing 12-36
        // 
        /// <summary>
        /// Performs a sanity check of constant and memberAccess
        /// Then it performs a different translation according to 
        /// the type of the member to be compared with
        /// </summary>
        private Expression VisitBinaryComparison(BinaryExpression b)
        {
            // FIRST STEP
            // We support only a comparison between constant 
            // and a possible Images query parameter 
            ConstantExpression constant =
                (b.Left as ConstantExpression ?? b.Right as ConstantExpression);
            MemberExpression memberAccess =
                (b.Left as MemberExpression ?? b.Right as MemberExpression);

            // SECOND STEP
            // Sanity check of parameters
            if ((memberAccess == null) || (constant == null))
            {
                throw new NotSupportedException(
                    string.Format(
                        "The binary operator '{0}' must compare a valid Images attribute with a constant",
                        b.NodeType));
            }

            // We need to get the constant value
            if (constant.Value == null)
            {
                throw new NotSupportedException(
                    string.Format(
                        "NULL constant is not supported in binary operator {0}",
                        b.ToString()));
            }
            switch (Type.GetTypeCode(constant.Value.GetType()))
            {
                case TypeCode.String:
                case TypeCode.Int16:
                case TypeCode.Int32:
                case TypeCode.Double:
                    break;
                default:
                    throw new NotSupportedException(
                        string.Format(
                            "Constant {0} is of an unsupported type ({1})",
                            constant.ToString(),
                            constant.Value.GetType().Name));
            }

            // THIRD STEP
            // Look for member name through Reflection
            // We assume that string properties in Images have the same name 
            // in QueryParameters
            // We have a special check for Images members of complex types
            if (memberAccess.Member.ReflectedType == typeof(DateTime))
            {
                TranslateTimeSpanComparison(b.NodeType, constant, memberAccess);
                return b;
            }
            else if (memberAccess.Member.ReflectedType == typeof(CameraInformation))
            {
                TranslateCameraInformationComparison(constant, memberAccess);
                return b;
            }
            else if (memberAccess.Member.ReflectedType != typeof(ImageInformation))
            {
                throw new NotSupportedException(
                        string.Format(
                            "Member {0} is not of type Images",
                            memberAccess.ToString()));
            }
            TranslateStandardComparisons(b.NodeType, constant, memberAccess);
            return b;
        }
开发者ID:sandrapatfer,项目名称:PROMPT11-02-AdvancedProgramming.vilhena,代码行数:76,代码来源:ImageQueryTranslator.cs

示例12: VisitBinary

        /// <summary>
        /// Process binary comparison operators.
        /// </summary>
        /// <param name="expression">
        /// The expression to visit.
        /// </param>
        /// <returns>
        /// The visited expression.
        /// </returns>
        private Expression VisitBinary(BinaryExpression expression)
        {
            if (expression != null)
            {
                // special case for enums, because we send them as strings
                UnaryExpression enumExpression = null;
                ConstantExpression constantExpression = null;
                BinaryExpression stringCompareExpression = null;
                if (this.CheckEnumExpression(expression, out enumExpression, out constantExpression))
                {
                    this.Visit(this.RewriteEnumExpression(enumExpression, (ConstantExpression)expression.Right, expression.NodeType));            
                }
                // special case concat as it's OData function isn't infix
                else if (expression.NodeType == ExpressionType.Add &&
                    expression.Left.Type == typeof(string) &&
                    expression.Right.Type == typeof(string))
                {
                    //rewrite addition into a call to concat, instead of duplicating generation code.
                    this.Visit(this.RewriteStringAddition(expression));
                }
                // special case for string comparisons emitted by the VB compiler
                else if (this.CheckVBStringCompareExpression(expression, out stringCompareExpression))
                {
                    this.Visit(stringCompareExpression);
                }
                else
                {
                    BinaryOperatorKind operatorKind;
                    switch (expression.NodeType)
                    {
                        case ExpressionType.AndAlso:
                        case ExpressionType.And:
                            operatorKind = BinaryOperatorKind.And;
                            break;
                        case ExpressionType.Or:
                        case ExpressionType.OrElse:
                            operatorKind = BinaryOperatorKind.Or;
                            break;
                        case ExpressionType.Equal:
                            operatorKind = BinaryOperatorKind.Equal;
                            break;
                        case ExpressionType.NotEqual:
                            operatorKind = BinaryOperatorKind.NotEqual;
                            break;
                        case ExpressionType.LessThan:
                            operatorKind = BinaryOperatorKind.LessThan;
                            break;
                        case ExpressionType.LessThanOrEqual:
                            operatorKind = BinaryOperatorKind.LessThanOrEqual;
                            break;
                        case ExpressionType.GreaterThan:
                            operatorKind = BinaryOperatorKind.GreaterThan;
                            break;
                        case ExpressionType.GreaterThanOrEqual:
                            operatorKind = BinaryOperatorKind.GreaterThanOrEqual;
                            break;
                        case ExpressionType.Add:
                            operatorKind = BinaryOperatorKind.Add;
                            break;
                        case ExpressionType.Subtract:
                            operatorKind = BinaryOperatorKind.Subtract;
                            break;
                        case ExpressionType.Multiply:
                            operatorKind = BinaryOperatorKind.Multiply;
                            break;
                        case ExpressionType.Divide:
                            operatorKind = BinaryOperatorKind.Divide;
                            break;
                        case ExpressionType.Modulo:
                            operatorKind = BinaryOperatorKind.Modulo;
                            break;
                        default:
                            throw new NotSupportedException(
                                string.Format(
                                    CultureInfo.InvariantCulture,
                                    "The operator '{0}' is not supported in the 'Where' Mobile Services query expression '{1}'.",
                                    expression.NodeType,
                                    expression.ToString()));
                    }                    

                    var node = new BinaryOperatorNode(operatorKind, null, null);
                    this.filterExpression.Push(node);

                    this.Visit(expression.Left);
                    this.Visit(expression.Right);

                    this.SetChildren(node);
                }
            }

            return expression;
//.........这里部分代码省略.........
开发者ID:RecursosOnline,项目名称:azure-mobile-services,代码行数:101,代码来源:FilterBuildingExpressionVisitor.cs

示例13: VisitBinary

        /// <summary>
        /// Deal with a special case for an index redirection where we are looking for
        /// an integer or some simply type. There is only one very special case where this
        /// shows up. Unlikely to be used by physics, actually. :-) The second case we
        /// handle is dealing with != for two object compares.
        /// </summary>
        /// <param name="expression"></param>
        /// <returns></returns>
        protected override Expression VisitBinary(BinaryExpression expression)
        {
            //
            // If we are comparing a "new" against a null, then we don't support that.
            //

            if (expression.Left.IsNull() || expression.Right.IsNull())
            {
                Expression nonNull = expression.Left.IsNull() ? expression.Right : expression.Left;
                if (nonNull.NodeType == ExpressionType.New)
                {
                    throw new InvalidOperationException(string.Format("Doing a null comparison to a temporary object created in the query is very likely to generate incorrect code - not supported ({0})", expression.ToString()));
                }
            }

            // If this is an array index, then...
            if (expression.NodeType == ExpressionType.ArrayIndex && expression.IsLeafType())
            {
                var rootExpr = expression.Left as MemberExpression;
                if (rootExpr != null)
                {
                    return Expression.ArrayIndex(VisitExpressionImplemented(rootExpr), expression.Right);
                }
            }

            // If this is a comparison, and these are objects that have indicies (in whatever we are looping through)...
            if (expression.NodeType == ExpressionType.Equal || expression.NodeType == ExpressionType.NotEqual)
            {
                // Are we pointing to something we can deal with?
                var indexLeft = ExtractIndexReference(expression.Left);
                if (indexLeft != null)
                {
                    var indexRight = ExtractIndexReference(expression.Right);
                    if (indexRight != null)
                    {
                        if (expression.NodeType == ExpressionType.NotEqual)
                        {
                            return Expression.NotEqual(indexLeft, indexRight);
                        } else
                        {
                            return Expression.Equal(indexLeft, indexRight);
                        }
                    }
                }
            }

            return base.VisitBinary(expression);
        }
开发者ID:gordonwatts,项目名称:LINQtoROOT,代码行数:56,代码来源:TranslatingExpressionVisitor.cs

示例14: TranslateBinary

        private string TranslateBinary(BinaryExpression expression)
        {
            if (expression.Right.NodeType == ExpressionType.Constant && (((ConstantExpression)expression.Right).Value == null))
            {
                switch (expression.NodeType)
                {
                    case ExpressionType.Equal:
                        return "(" + Translate(expression.Left) + " IS NULL)";
                    case ExpressionType.NotEqual:
                        return "(" + Translate(expression.Left) + " IS NOT NULL)";
                    default:
                        throw new SqlExpressionTranslatorException(expression.ToString());
                }
            }

            string op;

            switch (expression.NodeType)
            {
                case ExpressionType.Add:
                case ExpressionType.AddChecked:
                    op = "+";
                    break;
                case ExpressionType.AndAlso:
                    op = "AND";
                    break;
                case ExpressionType.Coalesce:
                {
                    string sql = _sqlDialect.SqlFunction(SqlDialect.Function.Coalesce, Translate(expression.Left), Translate(expression.Right));

                    return expression.Type == typeof (bool) ? TranslateTrue(sql) : sql;
                }
                case ExpressionType.Divide:
                    op = "/";
                    break;
                case ExpressionType.Equal:
                    op = "=";
                    break;
                case ExpressionType.GreaterThan:
                    op = ">";
                    break;
                case ExpressionType.GreaterThanOrEqual:
                    op = ">=";
                    break;
                case ExpressionType.LessThan:
                    op = "<";
                    break;
                case ExpressionType.LessThanOrEqual:
                    op = "<=";
                    break;
                case ExpressionType.Multiply:
                case ExpressionType.MultiplyChecked:
                    op = "*";
                    break;
                case ExpressionType.NotEqual:
                    op = "<>";
                    break;
                case ExpressionType.OrElse:
                    op = "OR";
                    break;
                case ExpressionType.Subtract:
                case ExpressionType.SubtractChecked:
                    op = "-";
                    break;
                default:
                    throw new SqlExpressionTranslatorException(expression.ToString());
            }

            return $"({Translate(expression.Left)} {op} {Translate(expression.Right)})";
        }
开发者ID:carlosga,项目名称:DB,代码行数:70,代码来源:SqlExpressionTranslator.cs

示例15: VisitBinary

        /// <summary>
        /// Process binary comparison operators.
        /// </summary>
        /// <param name="expression">The expression to visit.</param>
        /// <returns>The visited expression.</returns>
        protected override Expression VisitBinary(BinaryExpression expression)
        {
            if (expression != null)
            {
                // Special case concat as it's OData function isn't infix
                if (expression.NodeType == ExpressionType.Add &&
                    expression.Left.Type == typeof(string) &&
                    expression.Right.Type == typeof(string))
                {
                    this.filter.Append("concat(");
                    this.Visit(expression.Left);
                    this.filter.Append(",");
                    this.Visit(expression.Right);
                    this.filter.Append(")");
                }
                else
                {
                    this.filter.Append("(");
                    this.Visit(expression.Left);
                    switch (expression.NodeType)
                    {
                        case ExpressionType.AndAlso:
                            this.filter.Append(" and ");
                            break;
                        case ExpressionType.OrElse:
                            this.filter.Append(" or ");
                            break;
                        case ExpressionType.Equal:
                            this.filter.Append(" eq ");
                            break;
                        case ExpressionType.NotEqual:
                            this.filter.Append(" ne ");
                            break;
                        case ExpressionType.LessThan:
                            this.filter.Append(" lt ");
                            break;
                        case ExpressionType.LessThanOrEqual:
                            this.filter.Append(" le ");
                            break;
                        case ExpressionType.GreaterThan:
                            this.filter.Append(" gt ");
                            break;
                        case ExpressionType.GreaterThanOrEqual:
                            this.filter.Append(" ge ");
                            break;
                        case ExpressionType.Add:
                            this.filter.Append(" add ");
                            break;
                        case ExpressionType.Subtract:
                            this.filter.Append(" sub ");
                            break;
                        case ExpressionType.Multiply:
                            this.filter.Append(" mul ");
                            break;
                        case ExpressionType.Divide:
                            this.filter.Append(" div ");
                            break;
                        case ExpressionType.Modulo:
                            this.filter.Append(" mod ");
                            break;
                        default:
                            throw new NotSupportedException(
                                string.Format(
                                    CultureInfo.InvariantCulture,
                                    Resources.FilterBuildingExpressionVisitor_VisitOperator_Unsupported,
                                    expression.NodeType,
                                    expression.ToString()));
                    }
                    this.Visit(expression.Right);
                    this.filter.Append(")");
                }

                this.MarkVisited();
            }

            return expression;
        }
开发者ID:xqiu,项目名称:azure-mobile-services,代码行数:82,代码来源:FilterBuildingExpressionVisitor.cs


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