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 ///

　　/// 构造函数，初始化计数器等 ///

　　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 ///

　　/// 获取CPU个数 ///

　　public int ProcessorCount { get { return m_ProcessorCount; } } #endregion #region CPU占用率 ///

　　/// 获取CPU占用率 ///

　　public float CpuLoad { get { return pcCpuLoad.NextValue(); } } #endregion #region 可用内存 ///

　　/// 获取可用内存 ///

　　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 ///