using System.Diagnostics;

　int time = 3600;　　　　//單位為：秒
　Process.Start("c:/windows/system32/shutdown.exe", "-s -t "+time);

shutdown -s -f -t 0

shutdown -r -f -t 0

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            //重啟電腦
            //  APIHelper.ExitWindows(UFlag.EWX_REBOOT);//該方法無效
          string ss=  APIHelper.DOSCommand("shutdown -r -t 2");
            MessageBox.Show(ss);
        }
 
        private void button2_Click(object sender, EventArgs e)
        {
            //注銷電腦
            APIHelper.ExitWindows(UFlag.EWX_LOGOFF);
        }
 
        private void button3_Click(object sender, EventArgs e)
        {
            //關(guān)閉電腦
            // APIHelper.ExitWindows(UFlag.EWX_SHUTDOWN);//無效
           string ss= APIHelper.DOSCommand("shutdown -s -t 2");
            MessageBox.Show(ss);
        }
 
        private void button4_Click(object sender, EventArgs e)
        {
            string ss = APIHelper.DOSCommand("shutdown -a");
            MessageBox.Show(ss);
        }
    }
    /// <summary>
    /// PC操作功能代碼
    /// </summary>
    enum UFlag
    {
        /// <summary>
        /// 強(qiáng)迫終止沒有響應(yīng)的進(jìn)程
        /// </summary>
        EWX_FORCE=4,
        /// <summary>
        /// 注銷
        /// </summary>
        EWX_LOGOFF=0,
        /// <summary>
        /// 重啟
        /// </summary>
        EWX_REBOOT=2,
        /// <summary>
        /// 關(guān)閉系統(tǒng)
        /// </summary>
        EWX_SHUTDOWN=1
    }
    class APIHelper
    {
        /// <summary>
        /// 使用dos命令進(jìn)行操作
        /// </summary>
        /// <param name="cmdStr"></param>
        /// <returns></returns>
        public static string DOSCommand(string cmdStr)
        {
            System.Diagnostics.ProcessStartInfo info = new System.Diagnostics.ProcessStartInfo();
            info.CreateNoWindow =true;//不顯示黑窗口
            info.FileName = "cmd.exe";
            info.RedirectStandardError = true;
            info.RedirectStandardInput = true;
            info.RedirectStandardOutput = true;
            info.UseShellExecute = false;
            var p = System.Diagnostics.Process.Start(info);
            //處理辦法1:
            //using (System.IO.TextWriter tw= p.StandardInput)
            //{
            //    tw.WriteLine(cmdStr);
            //}
            
            //處理辦法2:在指令后添加:&exit。
            p.StandardInput.WriteLine(cmdStr + "&exit");
          
            p.WaitForExit();
            string str = "";
            using (System.IO.TextReader tr = p.StandardOutput)
            {
                str = tr.ReadToEnd();
            }
 
            p.Close();
            return str;
        }
        public static int ExitWindows(UFlag flag)
        {
            return ExitWindowsEx((int)flag, 0);
        }
        /// <summary>
        /// 注銷,關(guān)閉,重啟電腦
        /// </summary>
        /// <param name="uFlag">要執(zhí)行的操作</param>
        /// <param name="dwReserved">保留值，一般設(shè)置為0</param>
        /// <returns></returns>
        [DllImport("user32.dll")]
         extern static int ExitWindowsEx(int uFlag, int dwReserved);
        
    }

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace TestShutdown
{
    class SystemUtil
    {
        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        internal struct TokPriv1Luid
        {
            public int Count;
            public long Luid;
            public int Attr;
        }

        [DllImport("kernel32.dll", ExactSpelling = true)]
        internal static extern IntPtr GetCurrentProcess();

        [DllImport("advapi32.dll", ExactSpelling = true, SetLastError = true)]
        internal static extern bool OpenProcessToken(IntPtr h, int acc, ref   IntPtr phtok);

        [DllImport("advapi32.dll", SetLastError = true)]
        internal static extern bool LookupPrivilegeValue(string host, string name, ref   long pluid);

        [DllImport("advapi32.dll", ExactSpelling = true, SetLastError = true)]
        internal static extern bool AdjustTokenPrivileges(IntPtr htok, bool disall, ref TokPriv1Luid newst, int len, IntPtr prev, IntPtr relen);

        [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
        internal static extern bool ExitWindowsEx(int flg, int rea);

        internal const int SE_PRIVILEGE_ENABLED = 0x00000002;
        internal const int TOKEN_QUERY = 0x00000008;
        internal const int TOKEN_ADJUST_PRIVILEGES = 0x00000020;
        internal const string SE_SHUTDOWN_NAME = "SeShutdownPrivilege";
        internal const int EWX_LOGOFF = 0x00000000;
        internal const int EWX_SHUTDOWN = 0x00000001;
        internal const int EWX_REBOOT = 0x00000002;
        internal const int EWX_FORCE = 0x00000004;
        internal const int EWX_POWEROFF = 0x00000008;
        internal const int EWX_FORCEIFHUNG = 0x00000010;

        private static void DoExitWin(int flg)
        {
            bool ok;
            TokPriv1Luid tp;
            IntPtr hproc = GetCurrentProcess();
            IntPtr htok = IntPtr.Zero;
            ok = OpenProcessToken(hproc, TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, ref   htok);
            tp.Count = 1;
            tp.Luid = 0;
            tp.Attr = SE_PRIVILEGE_ENABLED;
            ok = LookupPrivilegeValue(null, SE_SHUTDOWN_NAME, ref   tp.Luid);
            ok = AdjustTokenPrivileges(htok, false, ref   tp, 0, IntPtr.Zero, IntPtr.Zero);
            ok = ExitWindowsEx(flg, 0);
        }

        public static void Reboot()
        {
            DoExitWin(EWX_FORCE | EWX_REBOOT); //重啟
        }

        public static void PowerOff()
        {
            DoExitWin(EWX_FORCE | EWX_POWEROFF);    //關(guān)機(jī)
        }

        public static void LogoOff()
        {
            DoExitWin(EWX_FORCE | EWX_LOGOFF);      //注銷
        }

    }

}