我正在尝试实现以下模式函数：
- MethodInfo GetMethod(
- Expression<Func<TTarget,EventHandler<TEventArgs>>> 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<Program,EventArgs>(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<TEventArgs>>> 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)
解决方法
你在那里的一半.
看下面的代码
看下面的代码
- public static void Main(string[] args)
- {
- var program = new Program();
- var methodInfo = GetMethod<Program,EventArgs>(()=> program.Method);
- Console.WriteLine(methodInfo.Name);
- }
- static MethodInfo GetMethod<TTarget,TEventArgs>(Expression<Func<EventHandler<TEventArgs>>> 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.
