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
///
/// 应用程序的主入口点。
///
[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();
}
}
}