C# InvocationExpression类代码示例

            public override void VisitInvocationExpression(InvocationExpression anyInvoke)
            {
                base.VisitInvocationExpression (anyInvoke);

                var match = pattern.Match (anyInvoke);
                if (!match.Success)
                    return;

                var anyResolve = ctx.Resolve (anyInvoke) as InvocationResolveResult;
                if (anyResolve == null || anyResolve.Member.FullName != "System.Linq.Enumerable.Any")
                    return;
                var whereInvoke = match.Get<InvocationExpression> ("whereInvoke").Single ();
                var whereResolve = ctx.Resolve (whereInvoke) as InvocationResolveResult;
                if (whereResolve == null || whereResolve.Member.FullName != "System.Linq.Enumerable.Where")
                    return;
                if (whereResolve.Member.Parameters.Count != 2)
                    return;
                var predResolve = whereResolve.Member.Parameters [1];
                if (predResolve.Type.TypeParameterCount != 2)
                    return;

                AddIssue (anyInvoke, "Redundant Where() call with predicate followed by Any()", script => {
                    var arg = whereInvoke.Arguments.Single ().Clone ();
                    var target = match.Get<Expression> ("target").Single ().Clone ();
                    script.Replace (anyInvoke, new InvocationExpression (new MemberReferenceExpression (target, "Any"), arg));
                });
            }

		static IEnumerable<IType> GetAllValidTypesFromInvocation(CSharpAstResolver resolver, InvocationExpression invoke, AstNode parameter)
		{
			int index = GetArgumentIndex(invoke.Arguments, parameter);
			if (index < 0)
				yield break;

			var targetResult = resolver.Resolve(invoke.Target) as MethodGroupResolveResult;
			if (targetResult != null) {
				foreach (var method in targetResult.Methods) {
					if (index < method.Parameters.Count) {
						if (method.Parameters [index].IsParams) {
							var arrayType = method.Parameters [index].Type as ArrayType;
							if (arrayType != null)
								yield return arrayType.ElementType;
						}

						yield return method.Parameters [index].Type;
					}
				}
				foreach (var extMethods in targetResult.GetExtensionMethods ()) {
					foreach (var extMethod in extMethods) {
						if (index + 1 < extMethod.Parameters.Count) {
							if (extMethod.Parameters [index + 1].IsParams) {
								var arrayType = extMethod.Parameters [index + 1].Type as ArrayType;
								if (arrayType != null)
									yield return arrayType.ElementType;
							}

							yield return extMethod.Parameters [index + 1].Type;
						}
					}
				}
			}
		}

        public static bool IsConditionallyRemoved(InvocationExpression invocationExpression, IEntity entity)
 		{
            if (entity == null)
            {
                return false;
            }
 			var result = new List<string>();
 			foreach (var a in entity.Attributes)
 			{
 				var type = a.AttributeType.GetDefinition();
 				if (type != null && type.FullName.Equals("System.Diagnostics.ConditionalAttribute", StringComparison.Ordinal))
                {
 					if (a.PositionalArguments.Count > 0)
                    {
 						var symbol = a.PositionalArguments[0].ConstantValue as string;
                        if (symbol != null)
                        {
                            result.Add(symbol);
                        }
 					}
 				}
 			}

            if (result.Count > 0)
            {
                var syntaxTree = invocationExpression.GetParent<SyntaxTree>();
                if (syntaxTree != null)
                {
                    return !result.Intersect(syntaxTree.ConditionalSymbols).Any();    
                }
            }

 			return false;
 		}

            public override void VisitInvocationExpression(InvocationExpression invocationExpression)
            {
                base.VisitInvocationExpression(invocationExpression);

                // Speed up the inspector by discarding some invocations early
                var hasEligibleArgument = invocationExpression.Arguments.Any(argument => {
                    var primitiveArg = argument as PrimitiveExpression;
                    return primitiveArg != null && primitiveArg.Value is string;
                });
                if (!hasEligibleArgument)
                    return;

                var invocationResolveResult = context.Resolve(invocationExpression) as CSharpInvocationResolveResult;
                if (invocationResolveResult == null)
                    return;
                Expression formatArgument;
                IList<Expression> formatArguments;
                TextLocation formatStart;
                if (!FormatStringHelper.TryGetFormattingParameters(invocationResolveResult, invocationExpression,
                                                                   out formatArgument, out formatStart, out formatArguments, null)) {
                    return;
                }
                var primitiveArgument = formatArgument as PrimitiveExpression;
                if (primitiveArgument == null || !(primitiveArgument.Value is string))
                    return;
                var format = (string)primitiveArgument.Value;
                var parsingResult = context.ParseFormatString(format);
                CheckSegments(parsingResult.Segments, formatStart, formatArguments, invocationExpression);
            }

        public IEnumerable<CodeAction> GetActions(RefactoringContext context)
        {
            if (!context.IsSomethingSelected) {
                yield break;
            }
            var pexpr = context.GetNode<PrimitiveExpression>();
            if (pexpr == null || !(pexpr.Value is string)) {
                yield break;
            }
            if (pexpr.LiteralValue.StartsWith("@", StringComparison.Ordinal)) {
                if (!(pexpr.StartLocation < new TextLocation(context.Location.Line, context.Location.Column - 1) && new TextLocation(context.Location.Line, context.Location.Column + 1) < pexpr.EndLocation)) {
                    yield break;
                }
            } else {
                if (!(pexpr.StartLocation < context.Location && context.Location < pexpr.EndLocation)) {
                    yield break;
                }
            }

            yield return new CodeAction (context.TranslateString("Introduce format item"), script => {
                var invocation = context.GetNode<InvocationExpression>();
                if (invocation != null && invocation.Target.IsMatch(PrototypeFormatReference)) {
                    AddFormatCallToInvocation(context, script, pexpr, invocation);
                    return;
                }

                var arg = CreateFormatArgument(context);
                var newInvocation = new InvocationExpression (PrototypeFormatReference.Clone()) {
                    Arguments = { CreateFormatString(context, pexpr, 0), arg }
                };

                script.Replace(pexpr, newInvocation);
                script.Select(arg);
            });
        }

			public override void VisitInvocationExpression (InvocationExpression anyInvoke)
			{
				base.VisitInvocationExpression (anyInvoke);
				
				var match = pattern.Match (anyInvoke);
				if (!match.Success)
					return;
				
				var anyResolve = ctx.Resolve (anyInvoke) as InvocationResolveResult;
				if (anyResolve == null || !HasPredicateVersion(anyResolve.Member))
					return;
				var whereInvoke = match.Get<InvocationExpression> ("whereInvoke").Single ();
				var whereResolve = ctx.Resolve (whereInvoke) as InvocationResolveResult;
				if (whereResolve == null || whereResolve.Member.Name != "Where" || !IsQueryExtensionClass(whereResolve.Member.DeclaringTypeDefinition))
					return;
				if (whereResolve.Member.Parameters.Count != 2)
					return;
				var predResolve = whereResolve.Member.Parameters [1];
				if (predResolve.Type.TypeParameterCount != 2)
					return;
				
				AddIssue (
					anyInvoke, string.Format("Redundant Where() call with predicate followed by {0}()", anyResolve.Member.Name),
				    script => {
						var arg = whereInvoke.Arguments.Single ().Clone ();
						var target = match.Get<Expression> ("target").Single ().Clone ();
						script.Replace (anyInvoke, new InvocationExpression (new MemberReferenceExpression (target, anyResolve.Member.Name), arg));
					});
			}

        private static void AssertInvokeIsOptimized(InvocationExpression expr, Expression expression, IReadOnlyList<Expression> args)
        {
            var n = args.Count;

            var updated = Update(expr);
            var visited = Visit(expr);

            foreach (var node in new[] { expr, updated, visited })
            {
                Assert.Same(expression, node.Expression);

                AssertInvocation(n, node);

                var argProvider = node as IArgumentProvider;
                Assert.NotNull(argProvider);

                Assert.Equal(n, argProvider.ArgumentCount);

                if (node != visited) // our visitor clones argument nodes
                {
                    for (var i = 0; i < n; i++)
                    {
                        Assert.Same(args[i], argProvider.GetArgument(i));
                        Assert.Same(args[i], node.Arguments[i]);
                    }
                }
            }
        }

		public static bool TryGetFormattingParameters(CSharpInvocationResolveResult invocationResolveResult, InvocationExpression invocationExpression,
		                                     		  out Expression formatArgument, out TextLocation formatStart, out IList<Expression> arguments,
		                                              Func<IParameter, Expression, bool> argumentFilter)
		{
			if (argumentFilter == null)
				argumentFilter = (p, e) => true;

			formatArgument = null;
			formatStart = default(TextLocation);
			arguments = new List<Expression>();
			var argumentToParameterMap = invocationResolveResult.GetArgumentToParameterMap();
			var resolvedParameters = invocationResolveResult.Member.Parameters;
			var allArguments = invocationExpression.Arguments.ToArray();
			for (int i = 0; i < allArguments.Length; i++) {
				var parameterIndex = argumentToParameterMap[i];
				if (parameterIndex < 0 || parameterIndex >= resolvedParameters.Count) {
					// No valid mapping for this parameter, skip it
					continue;
				}
				var parameter = resolvedParameters[parameterIndex];
				var argument = allArguments[i];
				if (parameter.Type.IsKnownType(KnownTypeCode.String) && parameterNames.Contains(parameter.Name)) {
					formatArgument = argument;
					formatStart = argument.StartLocation;
				} else if ((formatArgument != null || parameter.IsParams) && argumentFilter(parameter, argument)) {
					arguments.Add(argument);
				}
			}
			return formatArgument != null;
		}

 private void GetResolved(InvocationExpression invocationExpression, Action<CSharpInvocationResolveResult> resolved)
 {
     if (_Resolver.resolveResults.ContainsKey(invocationExpression))
     {
         var result = _Resolver.resolveResults[invocationExpression] as CSharpInvocationResolveResult;
         if (result != null) resolved(result);
     }
 }

 public ExpressionListBlock(IEmitter emitter, IEnumerable<Expression> expressions, Expression paramArg, InvocationExpression invocation = null)
     : base(emitter, null)
 {
     this.Emitter = emitter;
     this.Expressions = expressions;
     this.ParamExpression = paramArg;
     this.InvocationExpression = invocation;
 }

		public static bool CouldBeExpressionTree(InvocationExpression expr)
		{
			if (expr != null && expr.Arguments.Count == 2) {
				IMethod mr = expr.Annotation<IMethod>();
				return mr != null && mr.Name == "Lambda" && mr.DeclaringType.FullName == "System.Linq.Expressions.Expression";
			}
			return false;
		}

 protected InvocationExpression UpdateInvocation(InvocationExpression iv, Expression expression, IEnumerable<Expression> args)
 {
     if (args != iv.Arguments || expression != iv.Expression)
     {
         return Expression.Invoke(expression, args);
     }
     return iv;
 }

        AstNode ToStaticMethodInvocation(InvocationExpression invocation, MemberReferenceExpression memberReference,
		                                 CSharpInvocationResolveResult invocationRR)
        {
            var newArgumentList = invocation.Arguments.Select(arg => arg.Clone()).ToList();
            newArgumentList.Insert(0, memberReference.Target.Clone());
            var newTarget = memberReference.Clone() as MemberReferenceExpression;
            newTarget.Target = new IdentifierExpression(invocationRR.Member.DeclaringType.Name);
            return new InvocationExpression(newTarget, newArgumentList);
        }

		void AddFormatCallToInvocation (RefactoringContext context, Script script, PrimitiveExpression pExpr, InvocationExpression invocation)
		{
			var newInvocation = (InvocationExpression)invocation.Clone ();
			
			newInvocation.Arguments.First ().ReplaceWith (CreateFormatString (context, pExpr, newInvocation.Arguments.Count () - 1));
			newInvocation.Arguments.Add (CreateFormatArgument (context));
			
			script.Replace (invocation, newInvocation);
		}

        protected override bool VerifyArgumentUsage(InvocationExpression invocationExpression)
        {
            var firstParam = invocationExpression.Arguments.First() as PrimitiveExpression;
            if(firstParam != null)
            {
                return firstParam.Value.ToString().ToLower() == "hello world";
            }

            return false;
        }