存储一个EventHandler列表以取消订阅 [英] Store a list of EventHandlers to unsubscribe from

问题描述

我有一个类有一个方法，注册，它使用标准的 aClass.SomeEvent来预订其包含的类上的一些事件+ = the_handler 。该类还有一个取消注册方法，使用 - = 取消订阅这些事件。这很好，但是我们发现如果我们添加一个新的事件来订阅，那么很容易忘记在取消注册中包含取消订阅。维护事件订阅的这种手动方法证明是脆弱的。

有没有办法维护可以迭代和取消订阅动态的订阅列表？ （在取消注册之后调用注册可能会迭代并重新订阅。

一些细节：该类有3个其他类（目前但并非最终限于3），这些类的各种事件都是类型为$ code> EventHandler 或 EventHandler< T> 。

解决方案

彻底的看看，我发现这个答案：

C＃动态事件订阅

这样做（几乎）。我不喜欢使用字符串命名事件，所以我不会再追求这个设计了。即使这不是我想要的设计，答案显示了一个非常有用的方法来实现所需的行为，因此我将其标记为接受。

I have a class with a method, Register that subscribes to a number of events on classes that it contains, using the standard aClass.SomeEvent += the_handler. This class also has an Unregister method that unsubscribes from these events using -=. This works just fine but we're finding that if we add a new event to subscribe to that it's very easy to forget to include the unsubscription in Unregister. This manual method of maintaining event subscriptions is proving to be fragile.

Is there a way to maintain a list of subscriptions that can be iterated over and unsubscribed from dynamically? (And potentially iterate over and re-subscribe when calling Register after Unregister).

Some details: The class has a reference to 3 other classes (currently, but not definitively limited to 3), the various events on these classes are all of type EventHandler or EventHandler<T>.

解决方案

After a thorough look through SO I found this answer:

C# Dynamic Event Subscription

That does what I want (almost). I don't like having to name events using strings as and such I won't be pursuing this design any further. Even though it's not the design I want, the answer shows a very useful method to achieve the desired behaviour and as such I'm marking this as accepted.

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