服务用尽TCP连接 [英] Service running out of TCP connections

问题描述

我有一个Windows服务，它是使用c#.net 4.0创建的，它是一些事情的监视器-它上面有一个计时器，并且它有一个计时器，每5分钟运行一次.因此它具有计时器控件，并且计时器中有一个Elapsed事件:

I have a windows service, created using c# .net 4.0, which is a monitor for a few things - it has a timer on it, and it has a timer to run it every 5 mins. So it has a timer control, and in the timer there is a Elapsed event:

private void Timer_Elapsed(object sender, System.Events.ElapsedEventArgs e)
{
    FileMonitor fileMon = new FileMonitor(url);  

}

发生的事情是，在FileMonitor中，它使用TfsTeamProjectCollection类与TFS服务器项目建立了连接，

Whats happening is that in FileMonitor, its making a connection to a TFS server project, using the TfsTeamProjectCollection class as such:

TfsTeamProjectCollection tpc = new TfsTeamProjectCollection(url, new NetworkCredential( username, password, domain);

正在发生的事情是，我认为这会在方法Timer_Elapsed结束后立即自动关闭连接，但似乎没有，并且服务器用尽了TCP连接，其他服务无法再连接

What's happening is that I thought that this would automatically close the connection as soon as the method Timer_Elapsed ended, but it doesn't seem to, and the server is running out of TCP connections, and other services can't connect anymore.

所以我的问题有两个:

1. 在Windows服务中，如果我实例化一个新类，则该方法一结束就被销毁，对吗?
2. 在这种情况下，我读到TfsTeamProjectCollection并不会真正关闭连接:

1. In a windows service, if I instantiate a new class, it gets destroyed as soon as the method ends, right?
2. In this case, I've read that TfsTeamProjectCollection doesn't close the connection really: http://social.msdn.microsoft.com/Forums/vstudio/en-US/a0878218-d8dd-4c2a-916f-00bc5b3be2da/tfsteamprojectcollectiondisconnect-missing- - and if thats the case, what is a better way to handle this than what is suggested in that post?

总体而言，使用FileMonitor时我应该对服务本身做些什么-应该手动销毁它，还是让垃圾回收销毁它?

Overall, what should I do for the service itself when using FileMonitor - should I be destroying it manually, or let garbage collection destroy it?

推荐答案

1. 不，不是
2. 可以调用 Disconnect ，或者最好还是使用 using 关键字.

1. No it doesn't
2. Either call Disconnect, or better still use the using keyword.

由于该类实现了 IDispose ，因此您可以像这样使用 using 关键字:

Because the class implements IDispose, you can use the using keyword like this:

using ( TfsTeamProjectCollection x = New TfsTeamProjectCollection(...) ) {
    ... usage
}

这将关闭连接.回到第一点，c#不会像确定性析构函数C ++.相反，该对象是收集的垃圾，在将来的某个时刻，您可以受到限制/无法控制.

This will close the connection. To go back to the first point, c# does not implement deterministic destructors like C++. Instead the object is garbage collected at some point in the future, which you have limited/no control of.

因为该对象具有 finalizer 该连接它保持打开状态，当垃圾收集器运行时将被调用.但是，在连接用尽之前，GC尚未运行.

Because the object has a finalizer the connection it is holding open, will be called when the garbage collector runs. However, the GC is not running before you're running out of connections.

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