詳解C#擷取特定進程CPU和記憶體使用量率_C#教程

首先是擷取特定進程對象，可以使用Process.GetProcesses()方法來擷取系統中啟動並執行所有進程，或者使用Process.GetCurrentProcess()方法來擷取當前程式所對應的進程對象。當有了進程對象後，可以通過進程對象名稱來建立PerformanceCounter類型對象，通過設定PerformanceCounter建構函式的參數實現擷取特定進程的CPU和記憶體使用量情況。

具體執行個體代碼如下：

首先是擷取本機中所有進程對象，分別輸出某一時刻各個進程的記憶體使用量情況：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Diagnostics;using System.Threading;namespace CSharpPerformance{//該程式可以即時監控所有進程或者指定進程的工作集、私人工作集  class Program  {    static void Main(string[] args)    {      //建立一個Stopwatch變數用來統計程式已耗用時間      Stopwatch watch = Stopwatch.StartNew();      //擷取本機啟動並執行所有進程ID和進程名,並輸出哥進程所使用的工作集和私人工作集      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(進程類)", ps.WorkingSet64 / 1024);        Console.WriteLine("{0}:{1} {2:N}KB", ps.ProcessName, "工作集    ", pf2.NextValue() / 1024);        //私人工作集        Console.WriteLine("{0}:{1} {2:N}KB", ps.ProcessName, "私人工作集  ", pf1.NextValue() / 1024);      }      watch.Stop();      Console.WriteLine(watch.Elapsed);      Console.ReadLine();    }  }}

其中，工作集ps.WorkingSet64是靜態，pf2.NextValue()是動態變化的，工作集包含進程運行時其獨佔的記憶體和與其他進程共用的記憶體的和，而私人工作集是只包含進程獨佔的記憶體。

下面一組代碼可以動態顯示本程式所對應的進程的CPU和記憶體使用量率的變化：

首先是SystemInfo.cs類：

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個數    private PerformanceCounter pcCpuLoad;  //CPU計數器    private long m_PhysicalMemory = 0;  //實體記憶體    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聲明    [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 建構函式    /// <summary>    /// 建構函式，初始化計數器等    /// </summary>    public SystemInfo()    {      //初始化CPU計數器      pcCpuLoad = new PerformanceCounter("Processor", "% Processor Time", "_Total");      pcCpuLoad.MachineName = ".";      pcCpuLoad.NextValue();      //CPU個數      m_ProcessorCount = Environment.ProcessorCount;      //獲得實體記憶體      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個數    /// <summary>    /// 擷取CPU個數    /// </summary>    public int ProcessorCount    {      get      {        return m_ProcessorCount;      }    }    #endregion    #region CPU佔用率    /// <summary>    /// 擷取CPU佔用率    /// </summary>    public float CpuLoad    {      get      {        return pcCpuLoad.NextValue();      }    }    #endregion    #region 可用記憶體    /// <summary>    /// 擷取可用記憶體    /// </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 實體記憶體    /// <summary>    /// 擷取實體記憶體    /// </summary>    public long PhysicalMemory    {      get      {        return m_PhysicalMemory;      }    }    #endregion    #region 結束指定進程    /// <summary>    /// 結束指定進程    /// </summary>    /// <param name="pid">進程的 Process ID</param>    public static void EndProcess(int pid)    {      try      {        Process process = Process.GetProcessById(pid);        process.Kill();      }      catch { }    }    #endregion    #region 尋找所有應用程式標題    /// <summary>    /// 尋找所有應用程式標題    /// </summary>    /// <returns>應用程式標題範型</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     }}

然後是執行代碼：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Diagnostics;using System.Threading;namespace CSharpPerformance{//該程式可以即時監控程式本身對應進程的工作集、私人工作集和CPU使用率  class Program  {    static void Main(string[] args)    {      //擷取當前進程對象      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);      //上次記錄CPU的時間      TimeSpan prevCpuTime = TimeSpan.Zero;      //Sleep的時間間隔      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)      {        //第一種方法計算CPU使用率        //目前時間        TimeSpan curCpuTime = cur.TotalProcessorTime;        //計算        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(進程類)", cur.WorkingSet64 / 1024,value);//這個工作集只是在一開始初始化，後期不變        Console.WriteLine("{0}:{1} {2:N}KB CPU使用率：{3}", cur.ProcessName, "工作集    ", curpc.NextValue() / 1024,value);//這個工作集是動態更新的        //第二種計算CPU使用率的方法        Console.WriteLine("{0}:{1} {2:N}KB CPU使用率：{3}%", cur.ProcessName, "私人工作集  ", curpcp.NextValue() / 1024,curtime.NextValue()/Environment.ProcessorCount);        //Thread.Sleep(interval);        //第一種方法擷取系統CPU使用方式        Console.Write("\r系統CPU使用率：{0}%", totalcpu.NextValue());        //Thread.Sleep(interval);        //第二章方法擷取系統CPU和記憶體使用量情況        Console.Write("\r系統CPU使用率：{0}%，系統記憶體使用量大小：{1}MB({2}GB)", sys.CpuLoad, (sys.PhysicalMemory - sys.MemoryAvailable) / MB_DIV, (sys.PhysicalMemory - sys.MemoryAvailable) / (double)GB_DIV);        Thread.Sleep(interval);      }      Console.ReadLine();    }  }}

以上程式可以正常運行，沒隔1S重新整理一次，實現動態顯示本程式對應進程的CPU和記憶體使用量情況。

原文連結：http://www.cnblogs.com/maowang1991/p/3285983.html

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