.net - "Custom Event"在 VB.Net 中如何工作？

Question

在 C# 中，如果我想创建一个“自定义事件”，您可以执行以下操作:

private EventHandler _MyEvent;
Public Event EventHandler MyEvent 
{
   add{ _MyEvent += value; }
   remove{ _MyEvent -= Value; }
}
protected void RaiseMyEvent()
{
   if(_MyEvent != nul)
      _MyEvent(this, EventArgs.Empty);
}

在 VB 中，这不是那么简单，我也无法在网络上的任何地方找到任何帮助。
这不起作用:

private _MyEvent as EventHandler
Public Custom Event MyEvent as EventHandler
   AddHandler(ByVal value as EventHandler)
      _MyEvent += value 'does not work
      addhandler _MyEvent, value 'does not work
      [Delegate].Combine(_MyEvent, value) '_MyEvent still nothing
   End AddHandler
   RemoveHandler(ByVal value as EventHandler)
      'Same kind of stuff here
   End RemoveHandler
   RaiseEvent(sender as Object, e as EventArgs)
      if(_MyEvent IsNot Nothing) Then '_MyEvent is always nothing
         _MyEvent.Invoke(sender, e)
      End If
   End RaiseEvent
End Event

请帮忙。

Answer 1

VB 为您完成了大量工作。

简单地声明一个事件:

Public Event DidSomething(sender as object, e as EventArgs)

然后在代码的任何地方，调用下降的 Raise 事件

RaiseEvent DidSomething(me, EventArgs.Empty)