下面是在C#中實現關機、注銷和鎖定電腦的源代碼。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Microsoft.Win32;
using System.Runtime.InteropServices;
using System.IO;
using System.Threading;
using System.Diagnostics;
//using System.Configuration;
//using System.Xml ;

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// 鎖定計算機.
[DllImport("user32.dll")]
private static extern void LockWorkStation();//須寫extern
private void button1_Click(object sender, EventArgs e)
{
LockWorkStation();
}
//注銷計算機
[DllImport("user32.dll", EntryPoint = "ExitWindowsEx", CharSet = CharSet.Ansi)]
private static extern int ExitWindowsEx(int a,int b);
private void button1_Click(object sender, EventArgs e)
{
ExitWindowsEx(0, 0);
}
//關閉計算機.
private void button3_Click(object sender, EventArgs e)
{
System.Diagnostics.Process mp = new System.Diagnostics.Process();
mp.StartInfo.FileName = "cmd.exe";
mp.StartInfo.RedirectStandardInput = true;
mp.StartInfo.RedirectStandardOutput = true;
mp.StartInfo.RedirectStandardError = true;
mp.StartInfo.UseShellExecute = false;
mp.StartInfo.CreateNoWindow = true;
mp.Start();//啟動進程
mp.StandardInput.WriteLine("shutdown -s -t 0");//關機
}
//重啟計算機
private void button3_Click(object sender, EventArgs e)
{
System.Diagnostics.Process mp = new System.Diagnostics.Process();
mp.StartInfo.FileName = "cmd.exe";
mp.StartInfo.RedirectStandardInput = true;
mp.StartInfo.RedirectStandardOutput = true;
mp.StartInfo.RedirectStandardError = true;
mp.StartInfo.UseShellExecute = false;
mp.StartInfo.CreateNoWindow = true;
mp.Start();//啟動進程
mp.StandardInput.WriteLine("shutdown -r -t 0");//重啟
}