如何控制其中的事件处理程序的顺序？ [英] How can I control the order in which event handlers are fired?

问题描述

是事件处理解雇的顺序，它们连接到事件？如果没有，我可以实施某种次序到的事件处理程序，使得它们被称为在一个特定的顺序

Are event handlers fired in the order that they attached to the event? If not, can I enforce some kind of order onto the event handlers such that they are called in a specific order?

推荐答案

假设一个简单实现的情况下（使用+ =和 - =的委托场，这反过来会使用 Delegate.Combine /删除）然后是，事件处理程序将调用在他们已订阅的顺序。该担保在 Delegate.Combine <有效送达/ A>文件：

Assuming a simple implementation of the event (using += and -= on a delegate field, which in turn will use Delegate.Combine/Remove) then yes, the event handlers will be called in the order in which they're subscribed. The guarantee is effectively given in the Delegate.Combine documentation:

返回值

一个新的组播（可组合）委托   与调用列表   并置的调用列表的在的   和 B 的的顺序。

A new multicast (combinable) delegate with an invocation list that concatenates the invocation lists of a and b in that order.

请参阅我的文章关于事件的一些例子，其中 Delegate.Combine /删除做的（以及什么事件都喜欢在幕后）。

See my article about events for some examples of which Delegate.Combine/Remove do (and what events are like under the covers).

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