Question

这是创建性能计数器的代码:

var ftpPerfCounter = new PerformanceCounter("FTP Service", "Current Connections", "_Total");

这就是例外发生的地方:

int cnt = (int)Math.Round(ftpPerfCounter.NextValue());

s 这里的 Expeption 消息 :

"Error Message: The Counter layout for the Category specified is invalid, a counter of the type: AverageCount64, AverageTimer32, CounterMultiTimer, CounterMultiTimerInverse, CounterMultiTimer100Ns, CounterMultiTimer100NsInverse, RawFraction, or SampleFraction has to be immediately followed by any of the base counter types: AverageBase, CounterMultiBase, RawBase or SampleBase."

错误信息是相当隐秘的。我不知道今后能做些什么来避免例外。

详细

This happens on Windows Server 2008 R2 64-bit OS. The FTP Server is IIS.

Answer 1

至少在我的Windows Server 2008 R2 和 IS 7.5 上, 性能对应类别被称为“微软FTP Service ”, 而不是“FTP Service ” 。也许不同的OS/IIS版本不同, 但它很容易检查。

在目标服务器/机器上:

Run "Performance Monitor"
Click "Performance Monitor in the left navigation pane
Click the plus icon to Add a performance counter
Scroll down the list of available counters. Look for FTP or Microsoft FTP to see if it exists... note if you don t have Microsoft FTP services installed you won t see the performance counter.
Once found, select it, and you ll see a list of specific counter instances you can query. One of those instances is the _Total you were interested in.

当然,这也证明,反演反演与你的代码无关。这是一件好事,你应该知道!

关于如何在C#/.NET中与 < a href=" >绩效对计系统合作的具体最佳做法,请见这个堆积流站。

Answer 2

我没有在我的个人电脑上安装IIS, 但如果我安装了,这就是我想尝试的:

Try to use Visual Studio s code generator for WMI by drag-and-drop from Server Explorer. Inspect the generated code and see if there are any differences from your code.
Use reflector to see where the exception is thrown, set a custom breakpoint inside BCL, and reproduce. Then analyze the call stack contents and look for suspicious code paths or unexpected state.

Answer 3

他们似乎已经解决了一个类似的问题这里。也许你必须设置一个基础柜台?

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