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 / );
                 Console.WriteLine("{0}:{1}  {2:N}KB", ps.ProcessName, "工作集        ", pf2.NextValue() / );
                 //私有工作集
                 Console.WriteLine("{0}:{1}  {2:N}KB", ps.ProcessName, "私有工作集    ", pf1.NextValue() / );

             }

             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 = ;   //CPU个数
         private PerformanceCounter pcCpuLoad;   //CPU计数器
         private long m_PhysicalMemory = ;   //物理内存

         private const int GW_HWNDFIRST = ;
         private const int GW_HWNDNEXT = ;
         private const int GWL_STYLE = (-);
         private const int WS_VISIBLE = ;
         private const int WS_BORDER = ;

         #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 = ;
                 //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 =  * 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 > )
             {
                 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( * length + );
                     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 = ;

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

             SystemInfo sys = new SystemInfo();
             const int KB_DIV = ;
             const int MB_DIV =  * ;
             const int GB_DIV =  *  * ;
             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;
39                 prevCpuTime = curCpuTime;
40
41                 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。