C# 如何撤销事件绑定的匿名委托？

Question

我首先在某个操作中注册了事件：ProjectService.OnLoaded += (object, events) => {......};

在第二个操作中我需要取消这个事件，那我该如何实现？

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hello world

Answer 1

Type t = button1.GetType(); 
PropertyInfo pi = t.GetProperty("Events", BindingFlags.Instance | BindingFlags.NonPublic); 
EventHandlerList ehl = (EventHandlerList)pi.GetValue(button1, null); 
FieldInfo fieldInfo = (typeof(Control)).GetField("EventClick", BindingFlags.Static | BindingFlags.NonPublic); 
Delegate d = ehl[fieldInfo.GetValue(null)]; 
if (d != null) 
{
   foreach (Delegate temp in d.GetInvocationList()) 
  { 
    ehl.RemoveHandler(fieldInfo.GetValue(null), temp);
  }
}

Answer 2

define (object, events) => {......} ;有名字的方法 为delegatename，而非匿名的。 ProjectService.OnLoaded -=  delegatename;

Answer 3

我首先在某个操作中注册了事件：ProjectService.OnLoaded += (object, events) => {......};

在第二个操作中我需要取消这个事件，那我该如何实现？

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hello world

 

dear

取消注册用: -=

ProjectService.OnLoaded -= (object, events) => {......};

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秘訣無它，唯勤而已