分配 null 是否会从对象中删除所有事件处理程序?

Does assigning null remove all event handlers from an object?(分配 null 是否会从对象中删除所有事件处理程序?)

问题描述

我在班级中定义了新成员

I have defined new member in my class

protected COMObject.Call call_ = null;

这个类有以下我订阅的事件处理程序

This class has the following event handler that I subscribed to

call_.Destructed += new COMObject.DestructedEventHandler(CallDestructedEvent);

将我的成员设置为 null 如下删除事件处理程序?

Will setting my member to null as following remove the event handler?

call_ = null;

或者我必须使用 -= 取消订阅?

or I have to unsubscribed with -=?

推荐答案

是的，你应该使用重载的 -= 来取消订阅一个事件.

yes, you should use overloaded -= to unsubscribe an event.

简单地分配对 null 的引用不会自动执行此操作.该对象仍将监听该事件.

simply assigning a reference to null will not do that automatically. The object will still be listening to that event.

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