示例#1
0
        public static Expression Fold(Expression inputExpression)
        {
            if (inputExpression == null)
            {
                return(inputExpression);
            }

            switch (inputExpression.NodeType)
            {
            case ExpressionType.Negate:
            case ExpressionType.NegateChecked:
            case ExpressionType.Not:
            case ExpressionType.Convert:
            case ExpressionType.ConvertChecked:
            case ExpressionType.ArrayLength:
            case ExpressionType.Quote:
            case ExpressionType.TypeAs:
            case ExpressionType.UnaryPlus:
            case ExpressionType.OnesComplement:
            case ExpressionType.Increment:
            case ExpressionType.Decrement:
                return(ConstantFolding.FoldUnary((UnaryExpression)inputExpression));

            case ExpressionType.Add:
            case ExpressionType.AddChecked:
            case ExpressionType.Subtract:
            case ExpressionType.SubtractChecked:
            case ExpressionType.Multiply:
            case ExpressionType.MultiplyChecked:
            case ExpressionType.Divide:
            case ExpressionType.Modulo:
            case ExpressionType.And:
            case ExpressionType.AndAlso:
            case ExpressionType.Or:
            case ExpressionType.OrElse:
            case ExpressionType.LessThan:
            case ExpressionType.LessThanOrEqual:
            case ExpressionType.GreaterThan:
            case ExpressionType.GreaterThanOrEqual:
            case ExpressionType.Equal:
            case ExpressionType.NotEqual:
            case ExpressionType.Coalesce:
            case ExpressionType.ArrayIndex:
            case ExpressionType.RightShift:
            case ExpressionType.LeftShift:
            case ExpressionType.ExclusiveOr:
                return(ConstantFolding.FoldBinary((BinaryExpression)inputExpression));

            case ExpressionType.TypeIs:
                return(ConstantFolding.FoldTypeIs((TypeBinaryExpression)inputExpression));

            case ExpressionType.Conditional:
                return(ConstantFolding.FoldConditional((ConditionalExpression)inputExpression));

            case ExpressionType.Constant:
                return(inputExpression);

            case ExpressionType.Parameter:
                return(ConstantFolding.FoldParameter((ParameterExpression)inputExpression));

            case ExpressionType.MemberAccess:
                return(ConstantFolding.FoldMemberAccess((MemberExpression)inputExpression));

            case ExpressionType.Call:
                return(ConstantFolding.FoldMethodCall((MethodCallExpression)inputExpression));

            case ExpressionType.Lambda:
                return(ConstantFolding.FoldLambda((LambdaExpression)inputExpression));

            case ExpressionType.New:
                return(ConstantFolding.FoldNew((NewExpression)inputExpression));

            case ExpressionType.NewArrayInit:
            case ExpressionType.NewArrayBounds:
                return(ConstantFolding.FoldNewArray((NewArrayExpression)inputExpression));

            case ExpressionType.Invoke:
                return(ConstantFolding.FoldInvocation((InvocationExpression)inputExpression));

            case ExpressionType.MemberInit:
                return(ConstantFolding.FoldMemberInit((MemberInitExpression)inputExpression));

            case ExpressionType.ListInit:
                return(ConstantFolding.FoldListInit((ListInitExpression)inputExpression));

            default:
                throw new DocumentQueryException(string.Format(CultureInfo.CurrentUICulture,
                                                               "Unhandled expression type: '{0}'", inputExpression.NodeType));
            }
        }