詳解C#獲取特定進程CPU和內存使用率

2020-01-24 00:56:30

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首先是獲取特定進程對象，可以使用Process.GetProcesses()方法來獲取系統中運行的所有進程，或者使用Process.GetCurrentProcess()方法來獲取當前程序所對應的進程對象。當有了進程對象后，可以通過進程對象名稱來創建PerformanceCounter類型對象，通過設定PerformanceCounter構造函數的參數實現獲取特定進程的CPU和內存使用情況。

具體實例代碼如下：

首先是獲取本機中所有進程對象，分別輸出某一時刻各個進程的內存使用情況：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Diagnostics;using System.Threading;namespace CSharpPerformance{//該程序可以實時監控所有進程或者指定進程的工作集、私有工作集  class Program  {    static void Main(string[] args)    {      //新建一個Stopwatch變量用來統計程序運行時間      Stopwatch watch = Stopwatch.StartNew();      //獲取本機運行的所有進程ID和進程名,并輸出哥進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(進程類)", 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是靜態的，pf2.NextValue()是動態變化的，工作集包含進程運行時其獨占的內存和與其他進程共享的內存的和，而私有工作集是只包含進程獨占的內存。

下面一組代碼可以動態顯示本程序所對應的進程的CPU和內存使用率的變化：

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;  //物理內存    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 構造函數    /// <summary>    /// 構造函數，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;      //獲得物理內存      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個數    /// <summary>    /// 獲取CPU個數    /// </summary>    public int ProcessorCount    {      get      {        return m_ProcessorCount;      }    }    #endregion    #region CPU占用率    /// <summary>    /// 獲取CPU占用率    /// </summary>    public float CpuLoad    {      get      {        return pcCpuLoad.NextValue();      }    }    #endregion    #region 可用內存    /// <summary>    /// 獲取可用內存    /// </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 物理內存    /// <summary>    /// 獲取物理內存    /// </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 查找所有應用程序標題    /// <summary>    /// 查找所有應用程序標題    /// </summary>    /// <returns>應用程序標題范型</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{//該程序可以實時監控程序本身對應進程的工作集、私有工作集和CPU使用率  class Program  {    static void Main(string[] args)    {      //獲取當前進程對象      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        //當前時間        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，后期不變        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, "私有工作集  ", curpcp.NextValue() / 1024,curtime.NextValue()/Environment.ProcessorCount);        //Thread.Sleep(interval);        //第一種方法獲取系統CPU使用情況        Console.Write("/r系統CPU使用率：{0}%", totalcpu.NextValue());        //Thread.Sleep(interval);        //第二章方法獲取系統CPU和內存使用情況        Console.Write("/r系統CPU使用率：{0}%，系統內存使用大?。簕1}MB({2}GB)", sys.CpuLoad, (sys.PhysicalMemory - sys.MemoryAvailable) / MB_DIV, (sys.PhysicalMemory - sys.MemoryAvailable) / (double)GB_DIV);        Thread.Sleep(interval);      }      Console.ReadLine();    }  }}

以上程序可以正常運行，沒隔1S刷新一次，實現動態顯示本程序對應進程的CPU和內存使用情況。

原文鏈接：http://www.cnblogs.com/maowang1991/p/3285983.html

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