垃圾收集器和事件处理程序 [英] Garbage collector and event handlers

问题描述

一个快速的问题。说我有一个类，如下面的例子所示。

  class Subscriber 
 {
 private Publisher publisher =新发布者; 
 
 
 public Subscriber（）
 {
 publisher.SomeEvent + = new EventHandler（OnEventFired）; 
} 
 
 private void OnEventFired（object sender，EventArgs e）
 {
} 
 
} 
  

在程序的某个地方，我有一个如下所示的方法：

  public void DoSomething（）
 {
订阅者订阅者=新订阅者（）; 
} 
  

我希望这会导致内存泄漏，因为订阅者从未取消订阅从出版商的事件，从而导致他们彼此保持强烈的参考？

解决方案

这不会导致一个泄漏 - GC可以处理没有问题的循环引用。

但是，这意味着发布者将有效地引用订阅者，因此订阅者无法被垃圾收集，直到发布商有资格使用GC，或者取消订阅该事件。

A quick question. Say that I have a class implemented as in below example.

class Subscriber
{
    private Publisher publisher = new Publisher;


    public Subscriber()
    {
       publisher.SomeEvent += new EventHandler(OnEventFired);
    }

    private void OnEventFired(object sender, EventArgs e)
    {
    }

}

And somewhere in the program I have a method that looks like this:

public void DoSomething()
{
    Subscriber subscriber = new Subscriber();
}

Am I right to expect that this would cause a memory leak since subscriber never unsubscribes from publishers event, thus resulting in them both maintaining strong reference to each other?

解决方案

It wouldn't cause a leak - the GC can handle circular references with no problems.

However, it would mean that the publisher would effectively have a reference to the subscriber, so the subscriber couldn't be garbage collected until either the publisher is eligible for GC, or it unsubscribes from the event.

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