我需要调用Close（）在ManualResetEvent的？ [英] Do I need to call Close() on a ManualResetEvent?

问题描述

我一直对.NET线程读取并正在制定一个使用的 ManualResetEvent的。我发现很多在互联网上的代码示例。然而，阅读的WaitHandle 的文档时，我看到了以下内容：

I've been reading up on .NET Threading and was working on some code that uses a ManualResetEvent. I have found lots of code samples on the internet. However, when reading the documentation for WaitHandle, I saw the following:

的WaitHandle实现的Dispose
模式。见实施完成并
处置以清理非托管
资源。

WaitHandle implements the Dispose pattern. See Implementing Finalize and Dispose to Clean Up Unmanaged Resources.

似乎都不来电。关闭（）对他们创造的ManualResetEvent的对象的即使是好的递归和并发从pfxteam博客文章的（的修改 - 这已经using块我已经错过的）。这只是例子疏忽，还是不需要？我很好奇，因为一个WaitHandle的封装操作系统特定的对象，所以很容易被一个资源泄漏。

None of the samples seem to call .Close() on the ManualResetEvent objects they create, even the nice Recursion and Concurrency article from the pfxteam blog (Edit - this has a using block I has missed). Is this just example oversight, or not needed? I am curious because a WaitHandle "encapsulates operating system–specific objects," so there could easily be a resource leak.

推荐答案

在一般来说，如果一个对象实现的IDisposable 它这样做是有原因的，你应该叫的Dispose （或关闭，视情况而定）。在这个例子中，你的网站，ManualResetEvent的被包裹在使用语句，这将自动句柄上调用的Dispose 里面。在这种情况下，关闭与的Dispose （这是大多数的IDisposable ，提供了一个关闭方法实现）

In general, if an object implements IDisposable it is doing so for a reason and you should call Dispose (or Close, as the case may be). In the example you site, the ManualResetEvent is wrapped inside a using statement, which will "automatically" handle calling Dispose. In this case, Close is synonymous with Dispose (which is true in most IDisposable implementations that provide a Close method).

从示例代码：

using (var mre = new ManualResetEvent(false))
{
   ...
}

扩展到

var mre = new ManualResetEvent(false);
try
{
   ...
}
finally
{
   ((IDispoable)mre).Dispose();
}

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