C# MethodDeclaration类代码示例

        private void ValidateMethod(MethodDeclaration method, List<string> list, CompilationResult result)
        {
            var name = method.Name;

            if (String.IsNullOrWhiteSpace(name))
            {
                result.AddError(new CompilationMessage
                {
                    FilePath = method.OriginatingTree != null ? method.OriginatingTree.FilePath : null,
                    Location = DocumentLocation.FromTreeNode(method.OriginatingTree, method.OriginatingNode),
                    Message = "All generated method calls must have a valid name."
                });

                return;
            }

            if (list.Contains(name))
            {
                result.AddError(new CompilationMessage
                {
                    FilePath = method.OriginatingTree != null ? method.OriginatingTree.FilePath : null,
                    Location = DocumentLocation.FromTreeNode(method.OriginatingTree, method.OriginatingNode),
                    Message = "Method overloading is not supported. Consider using optional parameters, " +
                        "or providing an alternate name using the ScriptName attribute."
                });

                return;
            }

            list.Add(name);
        }

		CodeAction CreateFromExpression(RefactoringContext context, Expression expression)
		{
			var resolveResult = context.Resolve(expression);
			if (resolveResult.IsError)
				return null;
			
			return new CodeAction(context.TranslateString("Extract method"), script => {
				string methodName = "NewMethod";
				var method = new MethodDeclaration() {
					ReturnType = context.CreateShortType(resolveResult.Type),
					Name = methodName,
					Body = new BlockStatement() {
						new ReturnStatement(expression.Clone())
					}
				};
				if (!StaticVisitor.UsesNotStaticMember(context, expression))
					method.Modifiers |= Modifiers.Static;
				var task = script.InsertWithCursor(context.TranslateString("Extract method"), Script.InsertPosition.Before, method);

				Action<Task> replaceStatements = delegate {
					var target = new IdentifierExpression(methodName);
					script.Replace(expression, new InvocationExpression(target));
					script.Link(target, method.NameToken);
				};

				if (task.IsCompleted) {
					replaceStatements (null);
				} else {
					task.ContinueWith (replaceStatements, TaskScheduler.FromCurrentSynchronizationContext ());
				}
			});
		}

		static string GeneratePartialClassContextStub(ICodeContext context)
		{
			var member = context.CurrentMember;
			if (member == null)
				return "";
			var builder = new TypeSystemAstBuilder();
			MethodDeclaration decl;
			if (member is IMethod) {
				// If it's a method, convert it directly (including parameters + type parameters)
				decl = (MethodDeclaration)builder.ConvertEntity(member);
			} else {
				// Otherwise, create a method anyways, and copy the parameters
				decl = new MethodDeclaration();
				if (member is IParameterizedMember) {
					foreach (var p in ((IParameterizedMember)member).Parameters) {
						decl.Parameters.Add(builder.ConvertParameter(p));
					}
				}
			}
			decl.Name = "__DebuggerStub__";
			decl.ReturnType = builder.ConvertType(member.ReturnType);
			decl.Modifiers = member.IsStatic ? Modifiers.Static : Modifiers.None;
			// Make the method look like an explicit interface implementation so that it doesn't appear in CC
			decl.PrivateImplementationType = new SimpleType("__DummyType__");
			decl.Body = GenerateBodyFromContext(builder, context.LocalVariables.ToArray());
			return WrapInType(context.CurrentTypeDefinition, decl).ToString();
		}

		public override void Complete(CompletionContext context)
		{
			var invokeSignature = delegateType.GetMethods(m => m.Name == "Invoke").Single();
			var refactoringContext = SDRefactoringContext.Create(context.Editor, CancellationToken.None);
			var builder = refactoringContext.CreateTypeSystemAstBuilder();
			var handlerName = eventDefinition.Name;
			
			var throwStatement = new ThrowStatement();
			var decl = new MethodDeclaration {
				ReturnType = refactoringContext.CreateShortType(invokeSignature.ReturnType),
				Name = handlerName,
				Body = new BlockStatement {
					throwStatement
				}
			};
			
			decl.Parameters.AddRange(invokeSignature.Parameters.Select(builder.ConvertParameter));
			
			if (eventDefinition.IsStatic)
				decl.Modifiers |= Modifiers.Static;
			
			throwStatement.Expression = new ObjectCreateExpression(refactoringContext.CreateShortType("System", "NotImplementedException"));
			
			// begin insertion
			using (context.Editor.Document.OpenUndoGroup()) {
				context.Editor.Document.Replace(context.StartOffset, context.Length, handlerName);
				context.EndOffset = context.StartOffset + handlerName.Length;
				
				using (var script = refactoringContext.StartScript()) {
					script.InsertWithCursor(this.DisplayText, Script.InsertPosition.Before, decl)
						// TODO : replace with Link, once that is implemented
						.ContinueScript(() => script.Select(throwStatement));
				}
			}
		}

 public static void AddPrivateImplementation(Ast.AstType type, MethodDeclaration method)
 {
     if (privateImplementations.ContainsKey(type))
         privateImplementations[type].Add(method);
     else
         privateImplementations.Add(type, new List<MethodDeclaration>() { method });
 }

            public override void VisitMethodDeclaration(MethodDeclaration methodDeclaration)
            {
                // Only some methods are candidates for the warning

                if (methodDeclaration.Body.IsNull)
                    return;
                var methodResolveResult = ctx.Resolve(methodDeclaration) as MemberResolveResult;
                if (methodResolveResult == null)
                    return;
                var member = methodResolveResult.Member;
                if (member.IsOverride)
                    return;
                if (member.ImplementedInterfaceMembers.Any ())
                    return;
                if (usedDelegates.UsedMethods.Any (m => m.MemberDefinition == member))
                    return;
                if (currentTypeIsPartial && methodDeclaration.Parameters.Count == 2) {
                    if (methodDeclaration.Parameters.First().Name == "sender") {
                        // Looks like an event handler; the registration might be in the designer part
                        return;
                    }
                }
                foreach (var parameter in methodDeclaration.Parameters)
                    parameter.AcceptVisitor (this);
            }

            public override object VisitMethodDeclaration(MethodDeclaration methodDeclaration, object data)
            {
                if (methodDeclaration.Modifiers.HasFlag(Modifiers.Abstract))
                    UnlockWith(methodDeclaration);

                return base.VisitMethodDeclaration(methodDeclaration, data);
            }

        public override void VisitMethodDeclaration(MethodDeclaration methodDeclaration)
        {
            Guard.AgainstNullArgument("methodDeclaration", methodDeclaration);

            IEnumerable<ParameterDeclaration> parameters = methodDeclaration
                .GetChildrenByRole(Roles.Parameter)
                .Select(x => (ParameterDeclaration)x.Clone());

            var isVoid = false;
            var isAsync = methodDeclaration.Modifiers.HasFlag(Modifiers.Async);
            AstType returnType = methodDeclaration.GetChildByRole(Roles.Type).Clone();
            var type = returnType as PrimitiveType;
            if (type != null)
            {
                isVoid = string.Compare(
                    type.Keyword, "void", StringComparison.OrdinalIgnoreCase) == 0;
            }

            var methodType = new SimpleType(Identifier.Create(isVoid ? "Action" : "Func"));

            IEnumerable<AstType> types = parameters.Select(
                x => x.GetChildByRole(Roles.Type).Clone());

            methodType
                .TypeArguments
                .AddRange(types);

            if (!isVoid)
            {
                methodType.TypeArguments.Add(returnType);
            }
            var methodName = GetIdentifierName(methodDeclaration);

            var methodBody = methodDeclaration
                .GetChildrenByRole(Roles.Body)
                .FirstOrDefault();
            if (methodBody == null)
            {
                throw new NullReferenceException(string.Format("Method '{0}' has no method body", methodName));
            }
            methodBody = (BlockStatement)methodBody.Clone();

            var prototype = new VariableDeclarationStatement { Type = methodType };
            prototype.Variables.Add(new VariableInitializer(methodName));

            var anonymousMethod = new AnonymousMethodExpression(methodBody, parameters) { IsAsync = isAsync };
            var expression = new ExpressionStatement
            {
                Expression = new AssignmentExpression(
                    new IdentifierExpression(methodName), 
                    anonymousMethod)
            };

            _methods.Add(new MethodVisitorResult
            {
                MethodDefinition = methodDeclaration,
                MethodPrototype = prototype,
                MethodExpression = expression
            });
        }

		static string GeneratePartialClassContextStub(DebuggerCompletionContext context)
		{
			var compilation = SD.ParserService.GetCompilationForFile(context.FileName);
			var file = SD.ParserService.GetExistingUnresolvedFile(context.FileName);
			if (compilation == null || file == null)
				return "";
			var unresolvedMember = file.GetMember(context.Location);
			if (unresolvedMember == null)
				return "";
			var member = unresolvedMember.Resolve(new SimpleTypeResolveContext(compilation.MainAssembly));
			if (member == null)
				return "";
			var builder = new TypeSystemAstBuilder();
			MethodDeclaration decl;
			if (unresolvedMember is IMethod) {
				// If it's a method, convert it directly (including parameters + type parameters)
				decl = (MethodDeclaration)builder.ConvertEntity(member);
			} else {
				// Otherwise, create a method anyways, and copy the parameters
				decl = new MethodDeclaration();
				if (member is IParameterizedMember) {
					foreach (var p in ((IParameterizedMember)member).Parameters) {
						decl.Parameters.Add(builder.ConvertParameter(p));
					}
				}
			}
			decl.Name = "__DebuggerStub__";
			decl.ReturnType = builder.ConvertType(member.ReturnType);
			decl.Modifiers = unresolvedMember.IsStatic ? Modifiers.Static : Modifiers.None;
			// Make the method look like an explicit interface implementation so that it doesn't appear in CC
			decl.PrivateImplementationType = new SimpleType("__DummyType__");
			decl.Body = GenerateBodyFromContext(builder, context);
			return WrapInType(unresolvedMember.DeclaringTypeDefinition, decl).ToString();
		}

		void ConvertInterfaceImplementation(MethodDeclaration member)
		{
			// members without modifiers are already C# explicit interface implementations, do not convert them
			if (member.Modifier == Modifiers.None)
				return;
			while (member.InterfaceImplementations.Count > 0) {
				InterfaceImplementation impl = member.InterfaceImplementations[0];
				member.InterfaceImplementations.RemoveAt(0);
				if (member.Name != impl.MemberName) {
					MethodDeclaration newMember = new MethodDeclaration {
						Name = impl.MemberName,
						TypeReference = member.TypeReference,
						Parameters = member.Parameters,
						Body = new BlockStatement()
					};
					InvocationExpression callExpression = new InvocationExpression(new IdentifierExpression(member.Name));
					foreach (ParameterDeclarationExpression decl in member.Parameters) {
						callExpression.Arguments.Add(new IdentifierExpression(decl.ParameterName));
					}
					if (member.TypeReference.Type == "System.Void") {
						newMember.Body.AddChild(new ExpressionStatement(callExpression));
					} else {
						newMember.Body.AddChild(new ReturnStatement(callExpression));
					}
					newMember.InterfaceImplementations.Add(impl);
					InsertAfterSibling(member, newMember);
				}
			}
		}

			public override void VisitMethodDeclaration (MethodDeclaration methodDeclaration)
			{
				base.VisitMethodDeclaration (methodDeclaration);

				// partial method
				if (methodDeclaration.Body.IsNull)
					return;

				var cfg = cfgBuilder.BuildControlFlowGraph (methodDeclaration.Body, ctx.Resolver,
					ctx.CancellationToken);
				var stack = new Stack<ControlFlowNode> ();
				var visitedNodes = new HashSet<ControlFlowNode> ();
				stack.Push (cfg [0]);
				while (stack.Count > 0) {
					var node = stack.Pop ();

					// reach method's end
					if (node.PreviousStatement == methodDeclaration.Body)
						return;
					// reach a return statement
					if (node.NextStatement is ReturnStatement ||
						node.NextStatement is ThrowStatement)
						return;

					foreach (var edge in node.Outgoing) {
						if (visitedNodes.Add(edge.To))
							stack.Push(edge.To);
					}
				}

				AddIssue (methodDeclaration.NameToken, 
					ctx.TranslateString ("Method never reaches its end or a 'return' statement."));
			}

		public override object VisitMethodDeclaration(MethodDeclaration methodDeclaration, object data)
		{
			Push();
			object result = base.VisitMethodDeclaration(methodDeclaration, data);
			Pop();
			return result;
		}

            public override void VisitMethodDeclaration(MethodDeclaration methodDeclaration)
            {
                base.VisitMethodDeclaration (methodDeclaration);

                var resolveResult = ctx.Resolve (methodDeclaration) as MemberResolveResult;
                if (resolveResult == null)
                    return;
                var method = resolveResult.Member as IMethod;
                if (method == null)
                    return;

                if (method.Parameters.Count == 0 || !method.Parameters.Last ().IsOptional)
                    return;

                var overloads = method.DeclaringType.GetMethods(m => m.Name == method.Name && m.TypeParameters.Count == method.TypeParameters.Count)
                    .ToArray ();

                var parameterNodes = methodDeclaration.Parameters.ToArray();
                var parameters = new List<IParameter> ();
                for (int i = 0; i < method.Parameters.Count; i++) {
                    if (method.Parameters [i].IsOptional &&
                        overloads.Any (m => ParameterListComparer.Instance.Equals (parameters, m.Parameters))) {
                        AddIssue (parameterNodes [i].StartLocation, parameterNodes.Last ().EndLocation,
                            ctx.TranslateString ("Method with optional parameter is hidden by overload"));
                        break;
                    }
                    parameters.Add (method.Parameters [i]);
                }
            }

            public override object VisitMethodDeclaration(MethodDeclaration methodDeclaration, object data)
            {
                if (methodDeclaration.IsExtensionMethod)
                    UnlockWith(methodDeclaration);

                return base.VisitMethodDeclaration(methodDeclaration, data);
            }

            public override object VisitMethodDeclaration(MethodDeclaration methodDeclaration, object data)
            {
                if (methodDeclaration.Name.ToLower().Equals("main"))
                {
                    if (methodDeclaration.IsExtensionMethod == false &&
                        methodDeclaration.Modifiers.HasFlag(Modifiers.Static) &&
                        methodDeclaration.ReturnType.ToString() == "void")
                    {
                        var firstParam = methodDeclaration.Parameters.FirstOrDefault();

                        if (firstParam != null && firstParam.Type.ToString().ToLower() == "string[]")
                        {
                            // The following is a lesson in awesomeness:
                            //     Get all decendants of the method declaration that are IndexerExpressions,
                            //     which points to an identifier with the name [of our args variable]
                            var indexerIdentifierExpressions = methodDeclaration.Descendants
                                .OfType<IndexerExpression>()
                                .Select(a => a.Target)
                                .OfType<IdentifierExpression>();

                            if (indexerIdentifierExpressions.Any(a => a.Identifier == firstParam.Name))
                            {
                                UnlockWith(firstParam);
                            }
                        }
                    }
                }

                return base.VisitMethodDeclaration(methodDeclaration, data);
            }