从表达式树中提取方法名称？

我正在尝试实现以下模式函数：

MethodInfo GetMethod( Expression<Func<TTarget, EventHandler>> method) 

如果需要，我可以提供TTarget的实例

所需的用法是：

 public static void Main(string[] args) { var methodInfo = GetMethod(t => t.Method); Console.WriteLine("Hello, world!"); } private void Method(object sender, EventArgs e) { } 

这是我到目前为止所尝试的内容：

 private static MethodInfo GetMethod(TTarget target, Expression<Func<TTarget, EventHandler>> method) { var lambda = method as LambdaExpression; var body = lambda.Body as UnaryExpression; var call = body.Operand as MethodCallExpression; var mInfo = call.Method as MethodInfo; Console.WriteLine(mInfo); throw new NotImplementedException(); } 

打印出来：

System.Delegate CreateDelegate(System.Type, System.Object, System.Reflection.Met hodInfo)

Answer 1

你在那里的一半。 看下面的代码

 public static void Main(string[] args) { var program = new Program(); var methodInfo = GetMethod(()=> program.Method); Console.WriteLine(methodInfo.Name); } 

并使用以下代码获取方法名称。

 static MethodInfo GetMethod(Expression>> method) where TEventArgs:EventArgs { var convert = method.Body as UnaryExpression; var methodCall = (convert.Operand as MethodCallExpression); if (methodCall != null && methodCall.Arguments.Count>2 && methodCall.Arguments[2] is ConstantExpression) { var methodInfo = (methodCall.Arguments[2]as ConstantExpression).Value as MethodInfo; return methodInfo; } return null; } 

我希望这回答了你的问题。