C＃明确删除事件处理程序 [英] C# Explicitly Removing Event Handlers

问题描述

我在想，如果一个对象设置为null将清理附着在物体事件的任何事件处理器...

I was wondering if setting an object to null will clean up any eventhandlers that are attached to the objects events...

例如

Button button = new Button();
button.Click += new EventHandler(Button_Click);
button = null;

button = new Button();
button.Click += new EventHandler(Button_Click);
button = null;

等等...

etc...

请问这个造成内存泄露？

Will this cause a memory leak?

推荐答案

如果有到按钮在任何地方，那么就没有必要在这里删除事件处理程序，以避免内存泄漏。事件处理程序是单向的引用，所以拆卸时，事件的对象是长寿命的他们只需要，并且要避免生活比他们更长的处理的（即处理方法的对象）应该。在你的榜样，这是情况并非如此。

If there are no other references to button anywhere, then there is no need to remove the event handler here to avoid a memory leak. Event handlers are one-way references, so removing them is only needed when the object with events is long-lived, and you want to avoid the handlers (i.e. objects with handler methods) from living longer than they should. In your example, this isn't the case.

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