C# ObjectCreationExpressionSyntax类代码示例

        private static async Task<Document> ChangeToImmutableArrayCreateRange(
            ObjectCreationExpressionSyntax objectCreation,
            InitializerExpressionSyntax initializer,
            INamedTypeSymbol immutableArrayType,
            ITypeSymbol elementType,
            Document document,
            CancellationToken cancellationToken)
        {
            var generator = SyntaxGenerator.GetGenerator(document);

            var arrayElementType = (TypeSyntax)generator.TypeExpression(elementType);
            var arrayType = SyntaxFactory.ArrayType(arrayElementType, 
                SyntaxFactory.SingletonList(
                    SyntaxFactory.ArrayRankSpecifier(
                        SyntaxFactory.SingletonSeparatedList(
                            (ExpressionSyntax)SyntaxFactory.OmittedArraySizeExpression()))));

            var arrayCreationExpression = SyntaxFactory.ArrayCreationExpression(
                type: arrayType,
                initializer: SyntaxFactory.InitializerExpression(
                    kind: SyntaxKind.ArrayInitializerExpression,
                    expressions: initializer.Expressions))
                .WithAdditionalAnnotations(Formatter.Annotation);
            
            var type = generator.TypeExpression(immutableArrayType);
            var memberAccess = generator.MemberAccessExpression(type, "CreateRange");
            var invocation = generator.InvocationExpression(memberAccess, arrayCreationExpression);

            var oldRoot = await document.GetSyntaxRootAsync(cancellationToken);
            var newRoot = oldRoot.ReplaceNode(objectCreation, invocation);

            return document.WithSyntaxRoot(newRoot);
        }

 internal static bool CheckExceptionType(SemanticModel model, ObjectCreationExpressionSyntax objectCreateExpression, out ExpressionSyntax paramNode)
 {
     paramNode = null;
     var type = model.GetTypeInfo(objectCreateExpression).Type;
     if (type == null)
         return false;
     if (type.Name == typeof(ArgumentException).Name)
     {
         if (objectCreateExpression.ArgumentList.Arguments.Count >= 2)
         {
             paramNode = objectCreateExpression.ArgumentList.Arguments[1].Expression;
         }
         return paramNode != null;
     }
     if (type.Name == typeof(ArgumentNullException).Name ||
         type.Name == typeof(ArgumentOutOfRangeException).Name ||
         type.Name == "DuplicateWaitObjectException")
     {
         if (objectCreateExpression.ArgumentList.Arguments.Count >= 1)
         {
             paramNode = objectCreateExpression.ArgumentList.Arguments[0].Expression;
         }
         return paramNode != null;
     }
     return false;
 }

        public static string ObjectCreationExpression(ObjectCreationExpressionSyntax expression)
        {
            //Name all the arguments, since Swift usually requires named arguments when you create new objects.
            //Thanks! http://stackoverflow.com/questions/24174602/get-constructor-declaration-from-objectcreationexpressionsyntax-with-roslyn/24191494#24191494
            var symbol = Model.GetSymbolInfo(expression).Symbol as IMethodSymbol;

            var namedArgumentsList = new SeparatedSyntaxList<ArgumentSyntax>();

            for (var i = 0; i < expression.ArgumentList.Arguments.Count; i++)
            {
                var oldArgumentSyntax = expression.ArgumentList.Arguments[i];
                var parameterName = symbol.Parameters[i].Name;

                var nameColonSyntax = SyntaxFactory
                    .NameColon(SyntaxFactory.IdentifierName(parameterName))
                    .WithTrailingTrivia(SyntaxFactory.Whitespace(" "));

                var namedArgumentSyntax = SyntaxFactory.Argument(nameColonSyntax, oldArgumentSyntax.RefOrOutKeyword, oldArgumentSyntax.Expression);

                namedArgumentsList = namedArgumentsList.Add(namedArgumentSyntax);
            }

            //NOTE: this takes out expression.parent and everything, and probably screws with SyntaxModel stuff to
            return SyntaxNode(expression.Type) + SyntaxNode(SyntaxFactory.ArgumentList(namedArgumentsList));
        }

 public static SyntaxNode CreateUsing(SyntaxNode root, ObjectCreationExpressionSyntax objectCreation, SemanticModel semanticModel)
 {
     SyntaxNode newRoot;
     if (objectCreation.Parent.IsKind(SyntaxKind.SimpleAssignmentExpression))
     {
         var assignmentExpression = (AssignmentExpressionSyntax)objectCreation.Parent;
         var statement = assignmentExpression.Parent as ExpressionStatementSyntax;
         var identitySymbol = (ILocalSymbol)semanticModel.GetSymbolInfo(assignmentExpression.Left).Symbol;
         newRoot = UsedOutsideParentBlock(semanticModel, statement, identitySymbol)
             ? CreateRootAddingDisposeToEndOfMethod(root, statement, identitySymbol)
             : CreateRootWithUsing(root, statement, u => u.WithExpression(assignmentExpression));
     }
     else if (objectCreation.Parent.IsKind(SyntaxKind.EqualsValueClause) && objectCreation.Parent.Parent.IsKind(SyntaxKind.VariableDeclarator))
     {
         var variableDeclarator = (VariableDeclaratorSyntax)objectCreation.Parent.Parent;
         var variableDeclaration = (VariableDeclarationSyntax)variableDeclarator.Parent;
         var statement = (LocalDeclarationStatementSyntax)variableDeclaration.Parent;
         newRoot = CreateRootWithUsing(root, statement, u => u.WithDeclaration(variableDeclaration));
     }
     else
     {
         newRoot = CreateRootWithUsing(root, (ExpressionStatementSyntax)objectCreation.Parent, u => u.WithExpression(objectCreation));
     }
     return newRoot;
 }

        private IEnumerable<SignatureHelpItem> GetDelegateTypeConstructors(
            ObjectCreationExpressionSyntax objectCreationExpression,
            SemanticModel semanticModel,
            ISymbolDisplayService symbolDisplayService,
            IAnonymousTypeDisplayService anonymousTypeDisplayService,
            INamedTypeSymbol delegateType,
            INamedTypeSymbol containingType,
            CancellationToken cancellationToken)
        {
            var invokeMethod = delegateType.DelegateInvokeMethod;
            if (invokeMethod == null)
            {
                return null;
            }

            var position = objectCreationExpression.SpanStart;
            var item = CreateItem(
                invokeMethod, semanticModel, position,
                symbolDisplayService, anonymousTypeDisplayService,
                isVariadic: false,
                documentationFactory: null,
                prefixParts: GetDelegateTypePreambleParts(invokeMethod, semanticModel, position),
                separatorParts: GetSeparatorParts(),
                suffixParts: GetDelegateTypePostambleParts(invokeMethod),
                parameters: GetDelegateTypeParameters(invokeMethod, semanticModel, position, cancellationToken));

            return SpecializedCollections.SingletonEnumerable(item);
        }

        private bool TryGetObjectCreationExpression(SyntaxNode root, int position, ISyntaxFactsService syntaxFacts, SignatureHelpTriggerReason triggerReason, CancellationToken cancellationToken, out ObjectCreationExpressionSyntax expression)
        {
            if (!CommonSignatureHelpUtilities.TryGetSyntax(root, position, syntaxFacts, triggerReason, IsTriggerToken, IsArgumentListToken, cancellationToken, out expression))
            {
                return false;
            }

            return expression.ArgumentList != null;
        }

        public static bool GetClassificationForCommandCreation(ISemanticModel model, ObjectCreationExpressionSyntax syntax, CancellationToken cancellationToken = new CancellationToken())
        {
            if (syntax == null) return false;

            var cmdType = model.GetSemanticInfo(syntax, cancellationToken);
            //var cmdType = model.GetSemanticInfo(syntax, cancellationToken);

            return cmdType.Type.AllInterfaces.AsList().Select(x => x.Name).Any(x => x == "ICommand");
        }

        public static SyntaxNode CreateUsing(SyntaxNode root, ObjectCreationExpressionSyntax objectCreation, SemanticModel semanticModel)
        {
            SyntaxNode newRoot;
            if (objectCreation.Parent.IsKind(SyntaxKind.SimpleAssignmentExpression))
            {
                var assignmentExpression = (AssignmentExpressionSyntax)objectCreation.Parent;
                var statement = assignmentExpression.Parent as ExpressionStatementSyntax;
                var identitySymbol = (ILocalSymbol)semanticModel.GetSymbolInfo(assignmentExpression.Left).Symbol;
                newRoot = UsedOutsideParentBlock(semanticModel, statement, identitySymbol)
                    ? CreateRootAddingDisposeToEndOfMethod(root, statement, identitySymbol)
                    : CreateRootWithUsing(root, statement, u => u.WithExpression(assignmentExpression));
            }
            else if (objectCreation.Parent.IsKind(SyntaxKind.EqualsValueClause) && objectCreation.Parent.Parent.IsKind(SyntaxKind.VariableDeclarator))
            {
                var variableDeclarator = (VariableDeclaratorSyntax)objectCreation.Parent.Parent;
                var variableDeclaration = (VariableDeclarationSyntax)variableDeclarator.Parent;
                var statement = (LocalDeclarationStatementSyntax)variableDeclaration.Parent;
                newRoot = CreateRootWithUsing(root, statement, u => u.WithDeclaration(variableDeclaration.WithoutLeadingTrivia()));
            }
            else if (objectCreation.Parent.IsKind(SyntaxKind.Argument))
            {
                var identifierName = GetIdentifierName(objectCreation, semanticModel);

                var variableDeclaration = SyntaxFactory.VariableDeclaration(SyntaxFactory.IdentifierName(@"var"))
                    .WithVariables(SyntaxFactory.SingletonSeparatedList(SyntaxFactory.VariableDeclarator(SyntaxFactory.Identifier(identifierName))
                    .WithInitializer(SyntaxFactory.EqualsValueClause(SyntaxFactory.Token(SyntaxKind.EqualsToken), objectCreation))));

                var arg = objectCreation.Parent as ArgumentSyntax;
                var args = objectCreation.Parent.Parent as ArgumentListSyntax;
                var newArgs = args.ReplaceNode(arg, arg.WithExpression(SyntaxFactory.IdentifierName(identifierName)));

                StatementSyntax statement = objectCreation.FirstAncestorOfType<ExpressionStatementSyntax>();
                if (statement != null)
                {
                    var exprStatement = statement.ReplaceNode(args, newArgs);
                    var newUsingStatment = CreateUsingStatement(exprStatement, SyntaxFactory.Block(exprStatement))
                        .WithDeclaration(variableDeclaration);
                    return root.ReplaceNode(statement, newUsingStatment);
                }

                statement = (StatementSyntax)objectCreation.Ancestors().First(node => node is StatementSyntax);
                var newStatement = statement.ReplaceNode(args, newArgs);
                var statementsForUsing = new[] { newStatement }.Concat(GetChildStatementsAfter(statement));
                var usingBlock = SyntaxFactory.Block(statementsForUsing);
                var usingStatement = CreateUsingStatement(newStatement, usingBlock)
                    .WithDeclaration(variableDeclaration);
                var statementsToReplace = new List<StatementSyntax> { statement };
                statementsToReplace.AddRange(statementsForUsing.Skip(1));
                newRoot = root.ReplaceNodes(statementsToReplace, (node, _) => node.Equals(statement) ? usingStatement : null);
            }
            else
            {
                newRoot = CreateRootWithUsing(root, (ExpressionStatementSyntax)objectCreation.Parent, u => u.WithExpression(objectCreation));
            }
            return newRoot;
        }

 public BoundObjectCreationExpression(
     IType type,
     IConstructor boundConstructor,
     List<BoundExpression> boundParameter,
     ObjectCreationExpressionSyntax expressionSyntax)
     : base(expressionSyntax, type)
 {
     BoundConstructor = boundConstructor;
     BoundParameter = boundParameter;
 }

        private static async Task<Document> ChangeToImmutableArrayEmpty(ObjectCreationExpressionSyntax objectCreation, Document document, CancellationToken cancellationToken)
        {
            var generator = SyntaxGenerator.GetGenerator(document);
            var memberAccess = generator.MemberAccessExpression(objectCreation.Type, "Empty");

            var oldRoot = await document.GetSyntaxRootAsync(cancellationToken);
            var newRoot = oldRoot.ReplaceNode(objectCreation, memberAccess);

            return document.WithSyntaxRoot(newRoot);
        }

        public override void VisitObjectCreationExpression(ObjectCreationExpressionSyntax node)
        {
            var symbol = (IMethodSymbol)SemanticModel.GetSymbolInfo(node).Symbol;

            if (symbol != null)
            {
                IsAsyncLibraryConstruct(symbol.OriginalDefinition);
            }

            base.VisitObjectCreationExpression(node);
        }

 private static BlockSyntax CreateNewBlockParent(StatementSyntax statement, SemanticModel semanticModel, ObjectCreationExpressionSyntax objectCreationExpression, ISymbol variableSymbol)
 {
     var blockParent = statement.FirstAncestorOrSelf<BlockSyntax>();
     var assignmentExpressions = ObjectInitializerAnalyzer.FindAssignmentExpressions(semanticModel, statement, variableSymbol);
     var newBlockParent = SyntaxFactory.Block()
         .WithLeadingTrivia(blockParent.GetLeadingTrivia())
         .WithTrailingTrivia(blockParent.GetTrailingTrivia())
         .WithAdditionalAnnotations(Formatter.Annotation);
     var newAssignmentExpressions = new List<ExpressionStatementSyntax>();
     for (int i = 0; i < blockParent.Statements.Count; i++)
     {
         var blockStatement = blockParent.Statements[i];
         if (blockStatement.Equals(statement))
         {
             var initializationExpressions = new List<AssignmentExpressionSyntax>();
             foreach (var expressionStatement in assignmentExpressions)
             {
                 var assignmentExpression = expressionStatement.Expression as AssignmentExpressionSyntax;
                 var memberAccess = assignmentExpression.Left as MemberAccessExpressionSyntax;
                 var propertyIdentifier = memberAccess.Name as IdentifierNameSyntax;
                 initializationExpressions.Add(SyntaxFactory.AssignmentExpression(SyntaxKind.SimpleAssignmentExpression, propertyIdentifier, assignmentExpression.Right));
             }
             var initializers = SyntaxFactory.SeparatedList<ExpressionSyntax>(initializationExpressions);
             var newObjectCreationExpression = objectCreationExpression.WithInitializer(
                 SyntaxFactory.InitializerExpression(
                     SyntaxKind.ObjectInitializerExpression,
                     SyntaxFactory.Token(SyntaxFactory.ParseLeadingTrivia(" "), SyntaxKind.OpenBraceToken, SyntaxFactory.ParseTrailingTrivia("\n")),
                     initializers,
                     SyntaxFactory.Token(SyntaxFactory.ParseLeadingTrivia(" "), SyntaxKind.CloseBraceToken, SyntaxFactory.ParseTrailingTrivia(""))
                 ))
                 .WithLeadingTrivia(objectCreationExpression.GetLeadingTrivia())
                 .WithTrailingTrivia(objectCreationExpression.GetTrailingTrivia())
                 .WithAdditionalAnnotations(Formatter.Annotation);
             if (newObjectCreationExpression.ArgumentList?.Arguments.Count == 0)
             {
                 newObjectCreationExpression = newObjectCreationExpression.WithArgumentList(null);
             }
             var newLocalDeclarationStatement = statement.ReplaceNode(objectCreationExpression, newObjectCreationExpression)
                 .WithLeadingTrivia(statement.GetLeadingTrivia())
                 .WithTrailingTrivia(statement.GetTrailingTrivia())
                 .WithAdditionalAnnotations(Formatter.Annotation);
             newBlockParent = newBlockParent.AddStatements(newLocalDeclarationStatement);
             i += initializationExpressions.Count;
         }
         else
         {
             newBlockParent = newBlockParent.AddStatements(blockStatement
                 .WithLeadingTrivia(blockStatement.GetLeadingTrivia())
                 .WithTrailingTrivia(blockStatement.GetTrailingTrivia())
                 .WithAdditionalAnnotations(Formatter.Annotation));
         }
     }
     return newBlockParent;
 }

        public override void VisitObjectCreationExpression(ObjectCreationExpressionSyntax node)
        {
            var symbol = SemanticModel.GetSymbolInfo(node).Symbol;
            if (symbol != null)
            {
                Enums.ThreadingNamespaceDetected type = CheckThreadingUsage(symbol);
                Result.StoreDetectedThreadingNamespaceUsage(type);
                Result.WriteDetectedThreadingNamespaceUsage(type, Document.FilePath, symbol, node);
            }

            base.VisitObjectCreationExpression(node);
        }

        private bool IsDefaultCtorOnStruct(ObjectCreationExpressionSyntax objectCreation, ITypeSymbol symbol, SemanticModel semanticModel)
        {
            if (symbol.IsValueType)
            {
                var ctor = semanticModel.GetSymbolInfo(objectCreation).Symbol as IMethodSymbol;
                if (ctor != null)
                {
                    return ctor.Parameters.Length == 0;
                }
            }

            return false;
        }

        internal static List<string> GetValidParameterNames(ObjectCreationExpressionSyntax objectCreateExpression)
        {
            var names = new List<string>();
            var node = objectCreateExpression.Parent;
            while (node != null && !(node is TypeBlockSyntax) && !(node is AnonymousObjectCreationExpressionSyntax))
            {
                var lambda = node as LambdaExpressionSyntax;
                if (lambda != null)
                {
                    names.AddRange(lambda.SubOrFunctionHeader.ParameterList.Parameters.Select(p => p.Identifier.ToString()));
                    break;
                }

                var indexer = node as PropertyBlockSyntax;
                if ((indexer != null) && (indexer.PropertyStatement.ParameterList != null))
                {
                    names.AddRange(indexer.PropertyStatement.ParameterList.Parameters.Select(p => p.Identifier.ToString()));
                    break;
                }

                var methodDeclaration = node as MethodBlockSyntax;
                if (methodDeclaration != null)
                {
                    names.AddRange(methodDeclaration.SubOrFunctionStatement.ParameterList.Parameters.Select(p => p.Identifier.ToString()));
                    break;
                }

                var constructorDeclaration = node as ConstructorBlockSyntax;
                if (constructorDeclaration != null)
                {
                    names.AddRange(constructorDeclaration.SubNewStatement.ParameterList.Parameters.Select(p => p.Identifier.ToString()));
                    break;
                }
                var accessor = node as AccessorBlockSyntax;
                if (accessor != null)
                {
                    if (accessor.IsKind(SyntaxKind.SetAccessorBlock) ||
                        accessor.IsKind(SyntaxKind.AddHandlerAccessorBlock) ||
                        accessor.IsKind(SyntaxKind.RemoveHandlerAccessorBlock))
                    {
                        names.Add("value");
                    }

                    var propertyParent = node.Parent as PropertyBlockSyntax;
                    if ((propertyParent == null) || (propertyParent.PropertyStatement.ParameterList == null))
                        break;
                }
                node = node.Parent;
            }
            return names;
        }