c# - c#/perfmon 中的自定义性能计数器

Question

您好，我正在尝试创建一个用于 perfmon 的自定义性能计数器。下面的代码工作得很好，但是我有一个问题..

有了这个解决方案，我有一个计时器更新性能计数器的值，但是我不想运行这个可执行文件来获取我需要的数据。也就是说，我希望能够一次性安装计数器，然后使用 perfmon 查询数据(就像它对所有预安装的计数器所做的那样)。

我怎样才能做到这一点？

using System;
using System.Diagnostics;
using System.Net.NetworkInformation;

namespace PerfCounter
{
class PerfCounter
{
    private const String categoryName = "Custom category";
    private const String counterName = "Total bytes received";
    private const String categoryHelp = "A category for custom performance counters";
    private const String counterHelp = "Total bytes received on network interface";
    private const String lanName = "Local Area Connection"; // change this to match your network connection
    private const int sampleRateInMillis = 1000;
    private const int numberofSamples = 100;

    private static NetworkInterface lan = null;
    private static PerformanceCounter perfCounter;

    static void Main(string[] args)
    {
        setupLAN();
        setupCategory();
        createCounters();
        updatePerfCounters();
    }

    private static void setupCategory()
    {
        if (!PerformanceCounterCategory.Exists(categoryName))
        {
            CounterCreationDataCollection counterCreationDataCollection = new CounterCreationDataCollection();
            CounterCreationData totalBytesReceived = new CounterCreationData();
            totalBytesReceived.CounterType = PerformanceCounterType.NumberOfItems64;
            totalBytesReceived.CounterName = counterName;
            counterCreationDataCollection.Add(totalBytesReceived);
            PerformanceCounterCategory.Create(categoryName, categoryHelp, PerformanceCounterCategoryType.MultiInstance, counterCreationDataCollection);
        }
        else
            Console.WriteLine("Category {0} exists", categoryName);
    }

    private static void createCounters() {
        perfCounter = new PerformanceCounter(categoryName, counterName, false);
        perfCounter.RawValue = getTotalBytesReceived();
    }

    private static long getTotalBytesReceived()
    {
        return lan.GetIPv4Statistics().BytesReceived;
    }

    private static void setupLAN()
    {
        NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces();
        foreach (NetworkInterface networkInterface in interfaces)
        {
            if (networkInterface.Name.Equals(lanName))
                lan = networkInterface;
        }
    }
    private static void updatePerfCounters()
    {
        for (int i = 0; i < numberofSamples; i++)
        {
            perfCounter.RawValue = getTotalBytesReceived();
            Console.WriteLine("perfCounter.RawValue = {0}", perfCounter.RawValue);
            System.Threading.Thread.Sleep(sampleRateInMillis);
        }
    }
}

Answer 1

在 Win32 中，性能计数器通过让 PerfMon 加载提供计数器值的 DLL 来工作。

在 .NET 中，此 DLL 是一个 stub ，它使用共享内存与正在运行的 .NET 进程进行通信。该进程定期将新值推送到共享内存块，DLL 使它们可用作性能计数器。

因此，基本上，您可能必须在 native 代码中实现性能计数器 DLL，因为 .NET 性能计数器假定有一个进程正在运行。