首先通过为事件参数创建类开始。

First start off by creating a class for your event arguments.

// this can house any kind of information you want to send back with the trigger
public class MyNewEventArgs : EventArgs { ... }

接下来，创建该控件的类的事件。这是在使用委托做的，而事件本身。

Next, create the event on the control's class. this is done using a delegate, and the event itself.

// event delegate handler
public delegate void MyNewEventHandler(object s, MyNewEventArgs e);

// your control class
public class MyControl : Control
{
  // expose an event to attach to.
  public event MyNewEventHandler MyNewEvent;

接下来，你需要从你的code触发事件。我们通过抓住事件，检查用户，然后触发做到这一点。

Next you need to fire the event from your code. We do this by grabbing the event, checking for subscribers, then triggering.

// grab a copy of the subscriber list (to keep it thread safe)
var  myEvent = this.MyNewEvent;

// check there are subscribers, and trigger if necessary
if (myEvent != null)
  myEvent(this, new MyNewEventArgs());

更多信息可以在MSDN上找到在如何创建活动的。