C# 删除事件处理程序
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Removing event handlers
提问by Carlo
Is this:
这是：
Button.Click -= new EventHandler(Button_Click);
the same as this:
与此相同：
Button.Click -= Button_Click;
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?
我问是因为对我来说，前者似乎正在删除对方法的新引用，而后者正在删除方法本身。但话说回来，也许新的 EventHandler 部分隐含在 += 或 -= 重载中，以防程序员没有像那样显式分配它？
In case it is different how about
万一不同呢
Button.Click -= new EventHandler(Button_Click);
VS
VS
Button.Click -= Button_Click;
Thanks.
谢谢。
采纳答案by Konrad Rudolph
It is the same. The second is merely syntactic sugar for the first, and equality comparison is overloaded appropriately for delegate types:
这是相同的。第二个只是第一个的语法糖，并且对于委托类型适当地重载了相等比较：
Two delegates of the same type with the same targets, methods, and invocation lists are considered equal.
具有相同目标、方法和调用列表的相同类型的两个委托被认为是相等的。
Source: MSDN, Delegate.Equality Operator
回答by Brian Gideon
The end result is the same. The compiler is inferring the type of delegate automatically and as a result the new operator is not required to create it.
最终结果是一样的。编译器会自动推断委托的类型，因此不需要 new 运算符来创建它。
