using System;using System.Diagnostics;using System.Text;using System.Runtime.InteropServices; namespace ConsoleApplication1{    class Program    {        public static PerformanceCounter cpu;        //public static ComputerInfo cif;        static void Main(string[] args)        {            cpu = new PerformanceCounter("Processor", "% Processor Time", "_Total");           // cif = new ComputerInfo();            MEMORY_INFO MemInfo;            MemInfo = new MEMORY_INFO();            while(true)            {                GlobalMemoryStatus(ref  MemInfo);                Console.WriteLine(MemInfo.dwMemoryLoad.ToString() + "%的内存正在使用");                var percentage = cpu.NextValue();                Console.WriteLine(percentage + "%的CPU正在使用\n");                System.Threading.Thread.Sleep(2000);            }        }        [DllImport("kernel32")]        public static extern void GetSystemDirectory(StringBuilder SysDir, int count);        [DllImport("kernel32")]        public static extern void GetSystemInfo(ref  CPU_INFO cpuinfo);        [DllImport("kernel32")]        public static extern void GlobalMemoryStatus(ref  MEMORY_INFO meminfo);        [DllImport("kernel32")]        public static extern void GetSystemTime(ref  SYSTEMTIME_INFO stinfo);      }    //定义CPU的信息结构      [StructLayout(LayoutKind.Sequential)]    public struct CPU_INFO    {        public uint dwOemId;        public uint dwPageSize;        public uint lpMinimumApplicationAddress;        public uint lpMaximumApplicationAddress;        public uint dwActiveProcessorMask;        public uint dwNumberOfProcessors;        public uint dwProcessorType;        public uint dwAllocationGranularity;        public uint dwProcessorLevel;        public uint dwProcessorRevision;    }    //定义内存的信息结构      [StructLayout(LayoutKind.Sequential)]    public struct MEMORY_INFO    {        public uint dwLength;        public uint dwMemoryLoad;        public uint dwTotalPhys;        public uint dwAvailPhys;        public uint dwTotalPageFile;        public uint dwAvailPageFile;        public uint dwTotalVirtual;        public uint dwAvailVirtual;    }    //定义系统时间的信息结构      [StructLayout(LayoutKind.Sequential)]    public struct SYSTEMTIME_INFO    {        public ushort wYear;        public ushort wMonth;        public ushort wDayOfWeek;        public ushort wDay;        public ushort wHour;        public ushort wMinute;        public ushort wSecond;        public ushort wMilliseconds;    } }

可以循环判断cpu和内存使用率，来做相应的功能，比如迅雷的空闲下载就和这个差不多的，就是电脑cpu和内存都很闲的时候，做一些要做的工作，以免人在使用的时候同时运行造成电脑卡机。