避免在C＃中的重复事件订阅 [英] Avoid duplicate event subscriptions in C#

问题描述

你会如何建议避免重复事件订阅的最好方法？如果此行代码在两个地方执行，该事件将获得两次跑。 。我试图避免订阅两次第三方事件

How would you suggest the best way of avoiding duplicate event subscriptions? if this line of code executes in two places, the event will get ran twice. I'm trying to avoid 3rd party events from subscribing twice.

theOBject.TheEvent += RunMyCode;

在我的委托制定者，我可以有效地运行这个...

In my delegate setter, I can effectively run this ...

theOBject.TheEvent -= RunMyCode;
theOBject.TheEvent += RunMyCode;

但是，最好的方法是什么？

but is that the best way?

推荐答案

我认为，最有效的方法，就是让你的事件属性，并添加并发锁它在本的例

I think, the most efficient way, is to make your event a property and add concurrency locks to it as in this Example:

private EventHandler _theEvent;
private object _eventLock = new object();
public event EventHandler TheEvent
{
    add
    {
        lock (_eventLock) 
        { 
            _theEvent -= value; 
            _theEvent += value; 
        }
    }
    remove
    {
        lock (_eventLock) 
        { 
           _theEvent -= value; 
        }
    }
}

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