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：
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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();
}
}
}
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