我需要 Dispose() 或 Close() 一个 EventWaitHandle 吗?-C#/.NET问题

Do I need to Dispose() or Close() an EventWaitHandle?(我需要 Dispose() 或 Close() 一个 EventWaitHandle 吗?)

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问题描述

如果我使用 EventWaitHandle(或 AutoResetEvent、ManualResetEvent)在线程之间进行同步，那么我是否需要调用 Close() 或 Dispose() 方法，当我完成它时?

If I am using EventWaitHandle (or AutoResetEvent, ManualResetEvent) to synchronise between threads then do I need to call the Close() or Dispose() methods on that event handle when I am done with it?

EventWaitHandle 继承自 WaitHandle，后者实现了 IDisposable.如果我没有在任何包含 EventWaitHandle 的类上实现 IDisposable，FxCop 会抱怨.所以这表明我确实需要调用它.

EventWaitHandle inherits from WaitHandle, which implements IDisposable. And FxCop complains if I don't implement IDisposable on any class that contains an EventWaitHandle. So this suggests that I do need to call it.

但是，这些 MSDN 使用示例都没有调用 Dispose() 或 Close():

However none of these MSDN usage examples call Dispose() or Close():

http://msdn.microsoft.com/en-us/library/system.threading.eventwaithandle(VS.80).aspxhttp://msdn.microsoft.com/en-us/library/system.threading.manualresetevent(VS.80).aspxhttp://msdn.microsoft.com/en-us/library/system.threading.autoresetevent(VS.80).aspx

这只是微软无视自己建议的一个例子吗?

Is this just an example of Microsoft ignoring their own advice?

推荐答案

EventWaitHandle的一次性资源实际上是一个SafeHandle(包装在一个SafeWaitHandle).SafeHandle 实现了一个终结器，它最终确保释放必要的资源，因此让垃圾收集器/终结器线程处理它应该是安全的在这种情况下.


The disposable resource of an EventWaitHandle is actually a SafeHandle (wrapped in a SafeWaitHandle). SafeHandle implements a finalizer, which eventually makes sure the necessary resource is release, so it should be safe to let the garbage collector / finalizer thread handle it in this case. 
但是，当不再需要资源时，显式调用 Dispose() 总是一个好主意.
However, it is always a good idea to explicitly call Dispose() when the resource is no longer needed. 
C# 3.0 in a Nutshell 中的线程章节陈述
这种做法(可以说)是可以接受的带有等待句柄，因为它们有一个轻操作系统负担(异步代表完全依赖这种机制释放他们的 IAsyncResult 的等待句柄).

  This practice is (arguably) acceptable
  with wait handles because they have a
  light OS burden (asynchronous
  delegates rely on exactly this mechanism
  to release their IAsyncResult's wait
  handle).

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