C#实现关机重启及注销实例代码

本文所述的c#实例代码是一个基于visual c#2010编写的关机、重启、注销程序，类似的c#程序网上还有不少，每个人的写法都各有不同，这段程序供新手参考下。本代码中还用到了一个计时器，用来显示系统运行的时间，以下为完整实例代码：

using system;
using system.drawing;
using system.collections;
using system.componentmodel;
using system.windows.forms;
using system.data;
using system.runtime.interopservices;
using system.threading;
namespace shutdowncodes
{
 public class form1 : system.windows.forms.form
 {
 private system.windows.forms.groupbox groupbox1;
 private system.windows.forms.textbox textbox1;
 private system.windows.forms.button button1;
 private system.windows.forms.button button2;
 private system.windows.forms.button button3;
 private system.componentmodel.icontainer components;
 [structlayout(layoutkind.sequential, pack=1)]
 public struct tokpriv1luid
 {
  public int count;
  public long luid;
  public int attr;
 }
 [dllimport("kernel32.dll", exactspelling=true)]
  // getcurrentprocess函数返回当前进程的一个句柄
 public static extern intptr getcurrentprocess();
 [dllimport("advapi32.dll", exactspelling=true, setlasterror=true)]
  // openprocesstoken函数打开一个进程的访问代号
 public static extern bool openprocesstoken(intptr processhandles, int desiredaccess, ref intptr tokenhandle);
 [dllimport("advapi32.dll", setlasterror=true)]
  // lookupprivilegevalue函数获得本地唯一的标示符(luid)，用于在特定的系统中
  // 表示特定的优先权。
 public static extern bool lookupprivilegevalue(string lpsystemname, string lpname, ref long lpluid);
 // adjusttokenprivileges函数允许或者禁用指定访问记号的优先权。
 // 允许或者禁用优先权需要token_adjust_privileges访问权限。
 [dllimport("advapi32.dll", exactspelling=true, setlasterror=true)]
 public static extern bool adjusttokenprivileges(intptr tokenhandle, bool disableallprivileges, ref tokpriv1luid newstate, int bufferlength, intptr previousstate,intptr returnlength);
 // exitwindowsex函数可以注销，关机或者重新启动系统
 [dllimport("user32.dll", exactspelling=true, setlasterror=true)]
 public static extern bool exitwindowsex(int flg, int rea);
 private system.threading.timer timer;
 private const int se_privilege_enabled = 0x00000002;
 private const int token_query = 0x00000008;
 private const int token_adjust_privileges = 0x00000020;
 private const string se_shutdown_name = "seshutdownprivilege";
 private const int ewx_logoff = 0x00000000;   // 注销
 private const int ewx_shutdown = 0x00000001;  // 关机
 private const int ewx_reboot = 0x00000002;   // 重启
 private const int ewx_force = 0x00000004;
 private static void rebootcommand(int flg)
 {
  bool ok;
  tokpriv1luid tp;
  intptr hproc = getcurrentprocess(); // 得到当前的进程
  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 form1()
 {
  initializecomponent();
 }
 protected override void dispose( bool disposing )
 {
  if( disposing )
  {
  if (components != null)
  {
   components.dispose();
  }
  }
  base.dispose( disposing );
 }
 #region windows 窗体设计器生成的代码
 private void initializecomponent()
 {
  this.groupbox1 = new system.windows.forms.groupbox();
  this.textbox1 = new system.windows.forms.textbox();
  this.button1 = new system.windows.forms.button();
  this.button2 = new system.windows.forms.button();
  this.button3 = new system.windows.forms.button();
  this.groupbox1.suspendlayout();
  this.suspendlayout();
  //
  // groupbox1
  //
  this.groupbox1.controls.add(this.textbox1);
  this.groupbox1.location = new system.drawing.point(48, 24);
  this.groupbox1.name = "groupbox1";
  this.groupbox1.size = new system.drawing.size(192, 56);
  this.groupbox1.tabindex = 0;
  this.groupbox1.tabstop = false;
  this.groupbox1.text = "系统已运行时间";
  //
  // textbox1
  //
  this.textbox1.location = new system.drawing.point(24, 24);
  this.textbox1.name = "textbox1";
  this.textbox1.readonly = true;
  this.textbox1.size = new system.drawing.size(152, 21);
  this.textbox1.tabindex = 1;
  this.textbox1.text = "";
  //
  // button1
  //
  this.button1.location = new system.drawing.point(16, 112);
  this.button1.name = "button1";
  this.button1.size = new system.drawing.size(64, 32);
  this.button1.tabindex = 1;
  this.button1.text = "关闭系统";
  this.button1.click += new system.eventhandler(this.button1_click);
  //
  // button2
  //
  this.button2.location = new system.drawing.point(112, 112);
  this.button2.name = "button2";
  this.button2.size = new system.drawing.size(64, 32);
  this.button2.tabindex = 2;
  this.button2.text = "注销系统";
  this.button2.click += new system.eventhandler(this.button2_click);
  //
  // button3
  //
  this.button3.location = new system.drawing.point(208, 112);
  this.button3.name = "button3";
  this.button3.size = new system.drawing.size(64, 32);
  this.button3.tabindex = 3;
  this.button3.text = "重启系统";
  this.button3.click += new system.eventhandler(this.button3_click);
  //
  // form1
  //
  this.autoscalebasesize = new system.drawing.size(6, 14);
  this.clientsize = new system.drawing.size(296, 173);
  this.controls.add(this.button3);
  this.controls.add(this.button2);
  this.controls.add(this.button1);
  this.controls.add(this.groupbox1);
  this.name = "form1";
  this.text = "简单的关机程序";
  this.load += new system.eventhandler(this.form1_load);
  this.groupbox1.resumelayout(false);
  this.resumelayout(false);
 }
 #endregion
 /// <summary>
 /// 应用程序的主入口点。
 /// </summary>
 [stathread]
 static void main()
 {
  application.run(new form1());
 }
 private void button1_click(object sender, system.eventargs e)
 {
  rebootcommand(ewx_shutdown + ewx_force);
 }
 private void button2_click(object sender, system.eventargs e)
 {
  rebootcommand(ewx_logoff + ewx_force);
 }
 private void button3_click(object sender, system.eventargs e)
 {
  rebootcommand(ewx_reboot + ewx_force);
 }
 private void form1_load(object sender, system.eventargs e)
 {
  textbox1.text = (environment.tickcount / (1000 * 60)).tostring() + "分钟";
  // 每1秒钟更新一次textbox上显示的系统运行时间
  timer = new system.threading.timer(new timercallback(ontimer), null, 0, 1000);
 }
 // 获得系统已运行的时间
 private void ontimer(object state)
 {
  textbox1.text = (environment.tickcount / (1000 * 60)).tostring() + "分钟";
  textbox1.refresh();
 }
 }
}