C#获取CPU占用率、内存占用、磁盘占用、进程信息

代码：

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 Lemony.SystemInfo
{
    ///
    /// 系统信息类 - 获取CPU、内存、磁盘、进程信息
    ///
    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
        ///
        /// 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 = ;
                //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
        ///
        /// 获取物理内存
        ///
        public long PhysicalMemory
        {
            get
            {
                return m_PhysicalMemory;
            }
        }
        #endregion 

        #region 获得分区信息
        ///
        /// 获取分区信息
        ///
        public List GetLogicalDrives()
        {
            List drives = new List();
            ManagementClass diskClass = new ManagementClass("Win32_LogicalDisk");
            ManagementObjectCollection disks = diskClass.GetInstances();
            foreach (ManagementObject disk in disks)
            {
                // DriveType.Fixed 为固定磁盘(硬盘)
                if (int.Parse(disk["DriveType"].ToString()) == (int)DriveType.Fixed)
                {
                    drives.Add(new DiskInfo(disk["Name"].ToString(), long.Parse(disk["Size"].ToString()), long.Parse(disk["FreeSpace"].ToString())));
                }
            }
            return drives;
        }
        ///
        /// 获取特定分区信息
        ///
        /// 盘符
        public List GetLogicalDrives(char DriverID)
        {
            List drives = new List();
            WqlObjectQuery wmiquery = new WqlObjectQuery("SELECT * FROM Win32_LogicalDisk WHERE DeviceID = ’" + DriverID + ":’");
            ManagementObjectSearcher wmifind = new ManagementObjectSearcher(wmiquery);
            foreach (ManagementObject disk in wmifind.Get())
            {
                if (int.Parse(disk["DriveType"].ToString()) == (int)DriveType.Fixed)
                {
                    drives.Add(new DiskInfo(disk["Name"].ToString(), long.Parse(disk["Size"].ToString()), long.Parse(disk["FreeSpace"].ToString())));
                }
            }
            return drives;
        }
        #endregion 

        #region 获得进程列表
        ///
        /// 获得进程列表
        ///
        public List GetProcessInfo()
        {
            List pInfo = new List();
            Process[] processes = Process.GetProcesses();
            foreach (Process instance in processes)
            {
                try
                {
                    pInfo.Add(new ProcessInfo(instance.Id,
                        instance.ProcessName,
                        instance.TotalProcessorTime.TotalMilliseconds,
                        instance.WorkingSet64,
                        instance.MainModule.FileName));
                }
                catch { }
            }
            return pInfo;
        }
        ///
        /// 获得特定进程信息
        ///
        /// 进程名称
        public List GetProcessInfo(string ProcessName)
        {
            List pInfo = new List();
            Process[] processes = Process.GetProcessesByName(ProcessName);
            foreach (Process instance in processes)
            {
                try
                {
                    pInfo.Add(new ProcessInfo(instance.Id,
                        instance.ProcessName,
                        instance.TotalProcessorTime.TotalMilliseconds,
                        instance.WorkingSet64,
                        instance.MainModule.FileName));
                }
                catch { }
            }
            return pInfo;
        }
        #endregion 

        #region 结束指定进程
        ///
        /// 结束指定进程
        ///
        /// 进程的 Process ID
        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
        ///
        /// 查找所有应用程序标题
        ///
        /// 应用程序标题范型
        public static List FindAllApps(int Handle)
        {
            List Apps = new List(); 

            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
    }
}