例外：实例“实例的名称'不指定类别存在 [英] Exception: Instance 'Name of instance' does not exist in the specified Category

问题描述

当我创建和使用性能计数器是这样的：

When I create and use performance counters like this:

private readonly PerformanceCounter _cpuPerformanceCounter;
public ProcessViewModel(Process process)
        {

             _cpuPerformanceCounter = new PerformanceCounter("Process", "% Processor Time", process.ProcessName, true);
        }

public void Update()
        {
            CPU = (int)_cpuPerformanceCounter.NextValue() / Environment.ProcessorCount; // Exception
        }

...我得到一个异常的实例名称实例的'不指定类别存在，不明白为什么。

PS代码

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.net>
    <settings>
      <performanceCounters enabled="true"/>
    </settings>
  </system.net>
</configuration>

包含在App.config中

...

... included in App.config.

推荐答案

添加到前面的文章中，我已经看到了正在格式化像<过程; ProcessName> _<&的ProcessID GT; - 这取决于你在（Win XP的，赢Vista中，运7，运2003或2008服务器）上运行您的应用程序的操作系统。为了有一个可靠的方法来确定你的进程名获得其他性能计数器的道路，功能看起来是这样的：

Adding on to previous posts, I have seen processes being formatted like <ProcessName>_<ProcessId> - depending on the OS you are running your app on (Win XP, Win Vista, Win 7, Win 2003 or 2008 Server). In order to have a reliable way to identify your process name for obtaining other performance counters down the road, a function could look like this:

    private string ObtainProcessName()
    {
        string baseProcessName;
        string processName = null;
        int processId;
        bool notFound = true;
        int processOptionsChecked = 0;
        int maxNrOfParallelProcesses = 3 + 1;

        try
        {
            baseProcessName = Process.GetCurrentProcess().ProcessName;
        }
        catch (Exception exception)
        {
            return null;
        }

        try
        {
            processId = Process.GetCurrentProcess().Id;
        }
        catch (Exception exception)
        {
            return null;
        }

        while (notFound)
        {
            processName = baseProcessName;
            if (processOptionsChecked > maxNrOfParallelProcesses)
            {
                break;
            }

            if (1 == processOptionsChecked)
            {
                processName = string.Format("{0}_{1}", baseProcessName, processId);
            }
            else if (processOptionsChecked > 1)
            {
                processName = string.Format("{0}#{1}", baseProcessName, processOptionsChecked - 1);
            }

            try
            {
                PerformanceCounter counter = new PerformanceCounter("Process", "ID Process", processName);
                if (processId == (int)counter.NextValue())
                {
                    notFound = !true;
                }
            }
            catch (Exception)
            {
            }
            processOptionsChecked++;
        }
        return processName;
    }

这篇关于例外：实例“实例的名称'不指定类别存在的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！