详解C#获取特定进程CPU和内存使用率

首先是获取特定进程对象，可以使用Process.GetProcesses()方法来获取系统中运行的所有进程，或者使用Process.GetCurrentProcess()方法来获取当前程序所对应的进程对象。当有了进程对象后，可以通过进程对象名称来创建PerformanceCounter类型对象，通过设定PerformanceCounter构造函数的参数实现获取特定进程的CPU和内存使用情况。

具体实例代码如下：

首先是获取本机中所有进程对象，分别输出某一时刻各个进程的内存使用情况：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Threading;

namespace CSharpPerformance
{//该程序可以实时监控所有进程或者指定进程的工作集、私有工作集
  class Program
  {
    static void Main(string[] args)
    {
      //新建一个Stopwatch变量用来统计程序运行时间
      Stopwatch watch = Stopwatch.StartNew();
      //获取本机运行的所有进程ID和进程名,并输出哥进程所使用的工作集和私有工作集
      foreach (Process ps in Process.GetProcesses())
      {
        PerformanceCounter pf1 = new PerformanceCounter("Process", "Working Set - Private", ps.ProcessName);
        PerformanceCounter pf2 = new PerformanceCounter("Process", "Working Set", ps.ProcessName);
        Console.WriteLine("{0}:{1} {2:N}KB", ps.ProcessName, "工作集(进程类)", ps.WorkingSet64 / 1024);
        Console.WriteLine("{0}:{1} {2:N}KB", ps.ProcessName, "工作集    ", pf2.NextValue() / 1024);
        //私有工作集
        Console.WriteLine("{0}:{1} {2:N}KB", ps.ProcessName, "私有工作集  ", pf1.NextValue() / 1024);

      }

      watch.Stop();
      Console.WriteLine(watch.Elapsed);
      Console.ReadLine();
    }
  }
}

其中，工作集ps.WorkingSet64是静态的，pf2.NextValue()是动态变化的，工作集包含进程运行时其独占的内存和与其他进程共享的内存的和，而私有工作集是只包含进程独占的内存。

下面一组代码可以动态显示本程序所对应的进程的CPU和内存使用率的变化：

首先是SystemInfo.cs类：

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;
using System.IO;
using System.Text;
using System.Management;
using System.Runtime.InteropServices;

namespace CSharpPerformance
{
  public class SystemInfo
  {
    private int m_ProcessorCount = 0;  //CPU个数
    private PerformanceCounter pcCpuLoad;  //CPU计数器
    private long m_PhysicalMemory = 0;  //物理内存

    private const int GW_HWNDFIRST = 0;
    private const int GW_HWNDNEXT = 2;
    private const int GWL_STYLE = (-16);
    private const int WS_VISIBLE = 268435456;
    private const int WS_BORDER = 8388608;

    #region AIP声明
    [DllImport("IpHlpApi.dll")]
    extern static public uint GetIfTable(byte[] pIfTable, ref uint pdwSize, bool bOrder);

    [DllImport("User32")]
    private extern static int GetWindow(int hWnd, int wCmd);

    [DllImport("User32")]
    private extern static int GetWindowLongA(int hWnd, int wIndx);

    [DllImport("user32.dll")]
    private static extern bool GetWindowText(int hWnd, StringBuilder title, int maxBufSize);

    [DllImport("user32", CharSet = CharSet.Auto)]
    private extern static int GetWindowTextLength(IntPtr hWnd);
    #endregion

    #region 构造函数
    /// <summary>
    /// 构造函数，初始化计数器等
    /// </summary>
    public SystemInfo()
    {
      //初始化CPU计数器
      pcCpuLoad = new PerformanceCounter("Processor", "% Processor Time", "_Total");
      pcCpuLoad.MachineName = ".";
      pcCpuLoad.NextValue();

      //CPU个数
      m_ProcessorCount = Environment.ProcessorCount;

      //获得物理内存
      ManagementClass mc = new ManagementClass("Win32_ComputerSystem");
      ManagementObjectCollection moc = mc.GetInstances();
      foreach (ManagementObject mo in moc)
      {
        if (mo["TotalPhysicalMemory"] != null)
        {
          m_PhysicalMemory = long.Parse(mo["TotalPhysicalMemory"].ToString());
        }
      }
    }
    #endregion

    #region CPU个数
    /// <summary>
    /// 获取CPU个数
    /// </summary>
    public int ProcessorCount
    {
      get
      {
        return m_ProcessorCount;
      }
    }
    #endregion

    #region CPU占用率
    /// <summary>
    /// 获取CPU占用率
    /// </summary>
    public float CpuLoad
    {
      get
      {
        return pcCpuLoad.NextValue();
      }
    }
    #endregion

    #region 可用内存
    /// <summary>
    /// 获取可用内存
    /// </summary>
    public long MemoryAvailable
    {
      get
      {
        long availablebytes = 0;
        //ManagementObjectSearcher mos = new ManagementObjectSearcher("SELECT * FROM Win32_PerfRawData_PerfOS_Memory");
        //foreach (ManagementObject mo in mos.Get())
        //{
        //  availablebytes = long.Parse(mo["Availablebytes"].ToString());
        //}
        ManagementClass mos = new ManagementClass("Win32_OperatingSystem");
        foreach (ManagementObject mo in mos.GetInstances())
        {
          if (mo["FreePhysicalMemory"] != null)
          {
            availablebytes = 1024 * long.Parse(mo["FreePhysicalMemory"].ToString());
          }
        }
        return availablebytes;
      }
    }
    #endregion

    #region 物理内存
    /// <summary>
    /// 获取物理内存
    /// </summary>
    public long PhysicalMemory
    {
      get
      {
        return m_PhysicalMemory;
      }
    }
    #endregion

    #region 结束指定进程
    /// <summary>
    /// 结束指定进程
    /// </summary>
    /// <param name="pid">进程的 Process ID</param>
    public static void EndProcess(int pid)
    {
      try
      {
        Process process = Process.GetProcessById(pid);
        process.Kill();
      }
      catch { }
    }
    #endregion


    #region 查找所有应用程序标题
    /// <summary>
    /// 查找所有应用程序标题
    /// </summary>
    /// <returns>应用程序标题范型</returns>
    public static List<string> FindAllApps(int Handle)
    {
      List<string> Apps = new List<string>();

      int hwCurr;
      hwCurr = GetWindow(Handle, GW_HWNDFIRST);

      while (hwCurr > 0)
      {
        int IsTask = (WS_VISIBLE | WS_BORDER);
        int lngStyle = GetWindowLongA(hwCurr, GWL_STYLE);
        bool TaskWindow = ((lngStyle & IsTask) == IsTask);
        if (TaskWindow)
        {
          int length = GetWindowTextLength(new IntPtr(hwCurr));
          StringBuilder sb = new StringBuilder(2 * length + 1);
          GetWindowText(hwCurr, sb, sb.Capacity);
          string strTitle = sb.ToString();
          if (!string.IsNullOrEmpty(strTitle))
          {
            Apps.Add(strTitle);
          }
        }
        hwCurr = GetWindow(hwCurr, GW_HWNDNEXT);
      }

      return Apps;
    }
    #endregion   
  }
}

然后是执行代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Threading;

namespace CSharpPerformance
{//该程序可以实时监控程序本身对应进程的工作集、私有工作集和CPU使用率
  class Program
  {
    static void Main(string[] args)
    {
      //获取当前进程对象
      Process cur = Process.GetCurrentProcess();

      PerformanceCounter curpcp = new PerformanceCounter("Process", "Working Set - Private", cur.ProcessName);
      PerformanceCounter curpc = new PerformanceCounter("Process", "Working Set", cur.ProcessName);
      PerformanceCounter curtime = new PerformanceCounter("Process", "% Processor Time", cur.ProcessName);

      //上次记录CPU的时间
      TimeSpan prevCpuTime = TimeSpan.Zero;
      //Sleep的时间间隔
      int interval = 1000;

      PerformanceCounter totalcpu = new PerformanceCounter("Processor", "% Processor Time", "_Total");

      SystemInfo sys = new SystemInfo();
      const int KB_DIV = 1024;
      const int MB_DIV = 1024 * 1024;
      const int GB_DIV = 1024 * 1024 * 1024;
      while (true)
      {
        //第一种方法计算CPU使用率
        //当前时间
        TimeSpan curCpuTime = cur.TotalProcessorTime;
        //计算
        double value = (curCpuTime - prevCpuTime).TotalMilliseconds / interval / Environment.ProcessorCount * 100;
        prevCpuTime = curCpuTime;

        Console.WriteLine("{0}:{1} {2:N}KB CPU使用率：{3}", cur.ProcessName, "工作集(进程类)", cur.WorkingSet64 / 1024,value);//这个工作集只是在一开始初始化，后期不变
        Console.WriteLine("{0}:{1} {2:N}KB CPU使用率：{3}", cur.ProcessName, "工作集    ", curpc.NextValue() / 1024,value);//这个工作集是动态更新的
        //第二种计算CPU使用率的方法
        Console.WriteLine("{0}:{1} {2:N}KB CPU使用率：{3}%", cur.ProcessName, "私有工作集  ", curpcp.NextValue() / 1024,curtime.NextValue()/Environment.ProcessorCount);
        //Thread.Sleep(interval);

        //第一种方法获取系统CPU使用情况
        Console.Write("\r系统CPU使用率：{0}%", totalcpu.NextValue());
        //Thread.Sleep(interval);

        //第二章方法获取系统CPU和内存使用情况
        Console.Write("\r系统CPU使用率：{0}%，系统内存使用大小：{1}MB({2}GB)", sys.CpuLoad, (sys.PhysicalMemory - sys.MemoryAvailable) / MB_DIV, (sys.PhysicalMemory - sys.MemoryAvailable) / (double)GB_DIV);
        Thread.Sleep(interval);
      }

      Console.ReadLine();
    }
  }
}

以上程序可以正常运行，没隔1S刷新一次，实现动态显示本程序对应进程的CPU和内存使用情况。

原文链接：http://www.cnblogs.com/maowang1991/p/3285983.html

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