如何获得事件的订阅者? [英] How do I get the subscribers of an event?

问题描述

我需要将一个事件的订阅者复制到另一个事件.我可以获取事件的订阅者吗(比如返回委托的 MyEvent[0])?

I need to copy the subscribers of one event to another event. Can I get the subscribers of an event (like MyEvent[0] returning a delegate)?

如果这是不可能的，我将使用 add 访问器将委托添加到列表中.这会是最好的解决方案吗?

If this is not possible I would use the add accessor to add the delegates to a list. Would that be the best solution?

推荐答案

C# 事件/委托是多播的，因此委托是本身一个列表.从班级内部，要获得个别来电者，您可以使用:

C# events/delegates are multicast, so the delegate is itself a list. From within the class, to get individual callers, you can use:

if (field != null) 
{ 
    // or the event-name for field-like events
    // or your own event-type in place of EventHandler
    foreach(EventHandler subscriber in field.GetInvocationList())
    {
        // etc
    }
}

但是，要一次性全部赋值，只需使用 += 或直接赋值:

However, to assign all at once, just use += or direct assignment:

SomeType other = ...
other.SomeEvent += localEvent;

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