C# ArgumentSyntax.WithExpression方法代码示例

        public override SyntaxNode VisitArgument(ArgumentSyntax node)
        {
            var invocationSyntax = node.Parent.Parent as InvocationExpressionSyntax;
            if(invocationSyntax == null)
                return base.VisitArgument(node);
            var memberAccessExpressionSyntax = invocationSyntax.Expression as MemberAccessExpressionSyntax;
            if(memberAccessExpressionSyntax == null)
                return base.VisitArgument(node);
            var methodNameSyntax = memberAccessExpressionSyntax.Name as SimpleNameSyntax;

            var method = model.GetSymbolInfo(methodNameSyntax).Symbol as IMethodSymbol;
            if(method == null)
                return base.VisitArgument(node);
            var argList = (ArgumentListSyntax)node.Parent;
            //TODO check that parameter name preserved if specified, otherwise order can be broken
            var argIndex = argList.Arguments.IndexOf(node);
            var parameterSymbol = method.Parameters[argIndex]; //TODO when there is params argument in method index may be well out of range

            var lambda = node.Expression as LambdaExpressionSyntax;
            if(parameterSymbol.HasAttribute<MetaRewriteLambdaParamAttribute>(model.Compilation) && lambda != null) {
                //TODO error if value is not lambda
                return node.WithExpression(VisitLambdaExpression(lambda));
            }
            if(parameterSymbol.HasAttribute<MetaRewriteParamAttribute>(model.Compilation))
                return node.WithExpression(SyntaxFactory.LiteralExpression(SyntaxKind.StringLiteralExpression, SyntaxFactory.Literal(node.Expression.ToFullString())));
            return base.VisitArgument(node);
        }

		/// <summary>
		///     Lifts the expression represented by <paramref name="argument" />, if necessary.
		/// </summary>
		public override SyntaxNode VisitArgument(ArgumentSyntax argument)
		{
			if (argument.Parent.Parent is ElementAccessExpressionSyntax)
				return base.VisitArgument(argument);

			var requiresLifting = argument.HasAttribute<LiftExpressionAttribute>(SemanticModel);
			argument = (ArgumentSyntax)base.VisitArgument(argument);

			if (!requiresLifting)
				return argument;

			var expression = SyntaxBuilder.Lambda(Enumerable.Empty<ParameterSyntax>(), argument.Expression).WithTrivia(argument);
			return argument.WithExpression(expression);
		}

		/// <summary>
		///     Normalizes the <paramref name="argument" />.
		/// </summary>
		public override SyntaxNode VisitArgument(ArgumentSyntax argument)
		{
			// Special case for array accesses, as Roslyn doesn't return a symbol for the argument
			if (argument.Parent.Parent is ElementAccessExpressionSyntax)
			{
				var arrayExpression = ((ElementAccessExpressionSyntax)argument.Parent.Parent).Expression;
				if (SemanticModel.GetTypeInfo(arrayExpression).Type.TypeKind == TypeKind.Array)
					return base.VisitArgument(argument);
			}

			var parameterSymbol = argument.GetParameterSymbol(SemanticModel);
			if (parameterSymbol.RefKind != RefKind.None)
				return base.VisitArgument(argument);

			var parameterType = DetermineType(parameterSymbol.Type);
			if (parameterType == ExpressionType.Other)
				return base.VisitArgument(argument);

			return argument.WithExpression(ReplaceImplicitConversion(parameterType, argument.Expression));
		}

		/// <summary>
		///   Normalizes the <paramref name="argument" />.
		/// </summary>
		public override SyntaxNode VisitArgument(ArgumentSyntax argument)
		{
			// Special case for array accesses, as Roslyn doesn't return a symbol for the argument
			if (argument.Parent.Parent is ElementAccessExpressionSyntax)
			{
				var arrayExpression = ((ElementAccessExpressionSyntax)argument.Parent.Parent).Expression;
				var kind = SemanticModel.GetTypeInfo(arrayExpression).Type.TypeKind;
				if (kind == TypeKind.Array || kind == TypeKind.Pointer)
					return base.VisitArgument(argument);
			}

			var parameterSymbol = argument.GetParameterSymbol(SemanticModel);
			if (parameterSymbol.RefKind != RefKind.None)
				return base.VisitArgument(argument);

			var arraySymbol = parameterSymbol.Type as IArrayTypeSymbol;
			var isParamsFormula = arraySymbol != null && parameterSymbol.IsParams && IsFormulaType(arraySymbol.ElementType);

			if (!isParamsFormula && !IsFormulaType(parameterSymbol.Type))
				return base.VisitArgument(argument);

			return argument.WithExpression(ReplaceImplicitConversion(argument.Expression));
		}