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;
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("
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("
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。