返回用于从事件源中移除事件处理程序委托的方法。
Returns the method used to remove an event handler delegate from the event source.
例如，处理在某一类上定义的事件的事件处理程序委托不应嵌套在该类中。
For example, an event-handler delegate that handles an event defined on a class should not be nested in the class.
通过在应用程序委托类处理这些事件，你就能够响应它们。
By handling these events in your application delegate class, you have an opportunity to respond to them.
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