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

问题描述

您如何建议避免重复事件订阅的最佳方法?如果这行代码在两个地方执行，则事件将运行两次.我试图避免订阅两次的第 3 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;

在我的委托设置器中，我可以有效地运行它...

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

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

但这是最好的方法吗?

推荐答案

我认为，最有效的方法是让你的事件成为一个属性并为其添加并发锁，就像在这个 示例:

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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