c# 检测cpu使用率

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

//引用2命名空间
using System.Diagnostics;
using System.Threading;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Process[] p = Process.GetProcessesByName("devenv");//获取指定进程信息
            // Process[] p = Process.GetProcesses();//获取所有进程信息
            string cpu = string.Empty;
            string info = string.Empty;

            PerformanceCounter pp = new PerformanceCounter();//性能计数器
            pp.CategoryName = "Process";//指定获取计算机进程信息  如果传Processor参数代表查询计算机CPU
            pp.CounterName = "% Processor Time";//占有率
            //如果pp.CategoryName="Processor",那么你这里赋值这个参数 pp.InstanceName = "_Total"代表查询本计算机的总CPU。
            pp.InstanceName = "devenv";//指定进程
            pp.MachineName = ".";
            if (p.Length > 0)
            {
                foreach (Process pr in p)
                {
                    while (true)//1秒钟读取一次CPU占有率。
                    {
                        info = pr.ProcessName + "内存：" +
                                                (Convert.ToInt64(pr.WorkingSet64.ToString()) / 1024).ToString();//得到进程内存
                        Console.WriteLine(info + "    CPU使用情况：" + Math.Round(pp.NextValue(), 2).ToString() + "%");
                        Thread.Sleep(1000);
                    }
                }
            }
        }
    }
}