删除事件处理程序 [英] Removing event handlers

问题描述

是这样的：

Button.Click -= new EventHandler(Button_Click);

此相同

Button.Click -= Button_Click;

我问，因为对我来说，似乎前者是删除新的引用的方法，而后者是删除方法本身。不过话又说回来，也许新的事件处理程序的部分是隐含在+ =或 - =过载的情况下，程序员没有明确分配给它像

I ask because to me it seems that the former is removing a new reference to a method, and the latter one is removing a method itself. But then again, maybe the new EventHandler part is implicit in the += or -= overload in case the programmer doesn't explicitly assign it like that?

在情况下，它是关于

Button.Click -= new EventHandler(Button_Click);

VS

Button.Click -= Button_Click;

感谢。

推荐答案

这是一样的。第二个是第一个只是语法糖，和平等比较适当重载委托类型：

It is the same. The second is merely syntactic sugar for the first, and equality comparison is overloaded appropriately for delegate types:

相同类型，具有相同的目标，方法和调用列表的两名代表被认为是相等的。

Two delegates of the same type with the same targets, methods, and invocation lists are considered equal.

来源： MSDN，Delegate.Equality操作

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