代表事件 [英] Delegate events

问题描述

这是一个C＃问题。我有一个用户控件A. A包含另一个用户控件B.B有一个名为BEvent的事件。我想在A中公开这个事件，所以使用控件A的任何人都可以订阅BEvent。如何编写代码来实现这个设计？谢谢。

解决方案

您的用户控件内可以显示这样的控件B的事件...

  public event EventHandler EventA 
 {
 add {_control.EventB + = value; } 
删除{_control.EventB  -  = value; } 
} 
  

您应该查看代理哪个事件B正在使用，并确保活动A比赛。在这个例子中，我刚刚选择了EventHandler，因为在开发User Controls时很常见。

  public delegate void EventHandler（object sender，EventArgs e ）; 
  

This is a C# question. I have a user control A. A contains another user control B. B has an event called BEvent. I want to expose this event in A so anyone who uses control A can subscribe BEvent. How can I write code to implement this design? Thanks.

解决方案

Inside your user control A you could expose the event of control B like this...

public event EventHandler EventA
{
    add { _control.EventB += value; }
    remove { _control.EventB -= value; }
}

You should look at the delegate which event B is using, and ensure that event A matches. In this example i just selected EventHandler because that is quite common when developing User Controls

public delegate void EventHandler(object sender, EventArgs e);

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