注销、关闭和重启计算机

源码如下：

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace 关机重启
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        [DllImport("user32.dll", EntryPoint = "ExitWindowsEx", CharSet = CharSet.Ansi)]
        private static extern int ExitWindowsEx(int uFlags,int dwReserved);
        /// <summary>
        /// 注销计算机
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            ExitWindowsEx(0, 0);
        }
        /// <summary>
        /// 关闭计算机
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            System.Diagnostics.Process myProcess = new System.Diagnostics.Process();
            myProcess.StartInfo.FileName = "cmd.exe";
            myProcess.StartInfo.UseShellExecute = false;
            myProcess.StartInfo.RedirectStandardInput = true;
            myProcess.StartInfo.RedirectStandardOutput = true;
            myProcess.StartInfo.RedirectStandardError = true;
            myProcess.Start();
            myProcess.StandardInput.WriteLine("shutdown -s -t 0");
        }
        /// <summary>
        /// 重启计算机
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, EventArgs e)
        {
            System.Diagnostics.Process myProcess = new System.Diagnostics.Process();
            myProcess.StartInfo.FileName = "cmd.exe";
            myProcess.StartInfo.UseShellExecute = false;
            myProcess.StartInfo.RedirectStandardInput = true;
            myProcess.StartInfo.RedirectStandardOutput = true;
            myProcess.StartInfo.RedirectStandardError = true;
            myProcess.StartInfo.CreateNoWindow = true;
            myProcess.Start();
            myProcess.StandardInput.WriteLine("shutdown -r -t 0");
        }
    }
}
以上是打开cmd.exe，然后写命令来实现关机等功能