Question

C#中如何用代码实现计算机的重启？

比如我在Form里拉个button，在button里写什么代码可以使计算机重启和关闭！请那位高手指点一下！

Answer 1

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Forms;

namespace TimerComputerShutdown
{
/// <summary>
/// Summary description for TimerComputerShutdown.
/// </summary>
public class TimerComputerShutdown : System.Windows.Forms.Form
{
private System.Windows.Forms.Label labelWhatDoYouWantTheComputerToDo;
private System.Windows.Forms.ComboBox comboBox;
private System.Windows.Forms.Label labelSelectDateTimeToShutdownComputer;
private System.Windows.Forms.DateTimePicker dateTimePicker;
private System.Windows.Forms.Label labelDateTimeNow;
private System.Windows.Forms.Label labelDateTimeShutdown;
private System.Windows.Forms.Label labelNow;
private System.Windows.Forms.Label labelShutdown;
private System.Windows.Forms.Panel panelParent;
private System.Windows.Forms.Panel panelChild;
private System.Windows.Forms.CheckBox checkBox;
private System.Windows.Forms.Button buttonCancel;
private System.Windows.Forms.Button buttonInvoke;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;

private System.Threading.ThreadStart threadStart;
private System.Threading.Thread thread;

/// <summary>
/// 将窗口设为系统的前台窗口。这个函数可用于改变用户目前正在操作的应用程序
/// </summary>
/// <param name="hWnd"></param>
/// <returns></returns>
[DllImport("user32.dll")] private static extern
bool SetForegroundWindow(IntPtr hWnd);//将窗口设为系统的前台窗口。这个函数可用于改变用户目前正在操作的应用程序
/// <summary>
/// 更改某窗体状态，如最大化或还原
/// </summary>
/// <param name="hWnd"></param>
/// <param name="nCmdShow"></param>
/// <returns></returns>
[DllImport("user32.dll")] private static extern
bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);//更改某窗体状态，如最大化或还原
/// <summary>
/// 判断窗口是否已经最小化
/// </summary>
/// <param name="hWnd"></param>
/// <returns></returns>
[DllImport("user32.dll")] private static extern
bool IsIconic(IntPtr hWnd);//判断窗口是否已经最小化

private const int SW_HIDE = 0;
private const int SW_SHOWNORMAL = 1;
private const int SW_SHOWMINIMIZED = 2;
private const int SW_SHOWMAXIMIZED = 3;
private const int SW_SHOWNOACTIVATE = 4;
private const int SW_RESTORE = 9;
private const int SW_SHOWDEFAULT = 10;

public TimerComputerShutdown()
{

InitializeComponent();

}

/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(TimerComputerShutdown));
this.labelWhatDoYouWantTheComputerToDo = new System.Windows.Forms.Label();
this.comboBox = new System.Windows.Forms.ComboBox();
this.labelSelectDateTimeToShutdownComputer = new System.Windows.Forms.Label();
this.dateTimePicker = new System.Windows.Forms.DateTimePicker();
this.labelDateTimeNow = new System.Windows.Forms.Label();
this.labelDateTimeShutdown = new System.Windows.Forms.Label();
this.labelNow = new System.Windows.Forms.Label();
this.labelShutdown = new System.Windows.Forms.Label();
this.panelParent = new System.Windows.Forms.Panel();
this.panelChild = new System.Windows.Forms.Panel();
this.buttonCancel = new System.Windows.Forms.Button();
this.buttonInvoke = new System.Windows.Forms.Button();
this.checkBox = new System.Windows.Forms.CheckBox();
this.panelParent.SuspendLayout();
this.panelChild.SuspendLayout();
this.SuspendLayout();
//
// labelWhatDoYouWantTheComputerToDo
//
this.labelWhatDoYouWantTheComputerToDo.Location = new System.Drawing.Point(8, 8);
this.labelWhatDoYouWantTheComputerToDo.Name = "labelWhatDoYouWantTheComputerToDo";
this.labelWhatDoYouWantTheComputerToDo.Size = new System.Drawing.Size(216, 16);
this.labelWhatDoYouWantTheComputerToDo.TabIndex = 9;
this.labelWhatDoYouWantTheComputerToDo.Text = "选择任务:";
this.labelWhatDoYouWantTheComputerToDo.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
//
// comboBox
//
this.comboBox.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
this.comboBox.Items.AddRange(new object[] {
"关机",
"重启",
"待机",
"睡眠",
"注销"});
this.comboBox.Location = new System.Drawing.Point(184, 8);
this.comboBox.Name = "comboBox";
this.comboBox.Size = new System.Drawing.Size(112, 21);
this.comboBox.TabIndex = 0;
this.comboBox.SelectedIndexChanged += new System.EventHandler(this.comboBox_SelectedIndexChanged);
//
// labelSelectDateTimeToShutdownComputer
//
this.labelSelectDateTimeToShutdownComputer.Location = new System.Drawing.Point(8, 32);
this.labelSelectDateTimeToShutdownComputer.Name = "labelSelectDateTimeToShutdownComputer";
this.labelSelectDateTimeToShutdownComputer.Size = new System.Drawing.Size(144, 16);
this.labelSelectDateTimeToShutdownComputer.TabIndex = 7;
this.labelSelectDateTimeToShutdownComputer.Text = "选择任务时间: ";
this.labelSelectDateTimeToShutdownComputer.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
//
// dateTimePicker
//
this.dateTimePicker.CalendarFont = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.dateTimePicker.Cursor = System.Windows.Forms.Cursors.Arrow;
this.dateTimePicker.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.dateTimePicker.Format = System.Windows.Forms.DateTimePickerFormat.Time;
this.dateTimePicker.Location = new System.Drawing.Point(184, 32);
this.dateTimePicker.Name = "dateTimePicker";
this.dateTimePicker.RightToLeft = System.Windows.Forms.RightToLeft.No;
this.dateTimePicker.Size = new System.Drawing.Size(112, 21);
this.dateTimePicker.TabIndex = 1;
this.dateTimePicker.Value = new System.DateTime(2002, 9, 27, 0, 0, 0, 0);
this.dateTimePicker.ValueChanged += new System.EventHandler(this.dateTimePicker_ValueChanged);
//
// labelDateTimeNow
//
this.labelDateTimeNow.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.labelDateTimeNow.Location = new System.Drawing.Point(8, 8);
this.labelDateTimeNow.Name = "labelDateTimeNow";
this.labelDateTimeNow.Size = new System.Drawing.Size(120, 16);
this.labelDateTimeNow.TabIndex = 4;
this.labelDateTimeNow.Text = "当前时间:";
this.labelDateTimeNow.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
//
// labelDateTimeShutdown
//
this.labelDateTimeShutdown.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.labelDateTimeShutdown.Location = new System.Drawing.Point(8, 32);
this.labelDateTimeShutdown.Name = "labelDateTimeShutdown";
this.labelDateTimeShutdown.Size = new System.Drawing.Size(120, 16);
this.labelDateTimeShutdown.TabIndex = 5;
this.labelDateTimeShutdown.Text = "任务时间:";
this.labelDateTimeShutdown.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
//
// labelNow
//
this.labelNow.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.labelNow.ForeColor = System.Drawing.SystemColors.ControlText;
this.labelNow.Location = new System.Drawing.Point(136, 8);
this.labelNow.Name = "labelNow";
this.labelNow.Size = new System.Drawing.Size(136, 16);
this.labelNow.TabIndex = 1;
this.labelNow.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
//
// labelShutdown
//
this.labelShutdown.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.labelShutdown.ForeColor = System.Drawing.SystemColors.ControlText;
this.labelShutdown.Location = new System.Drawing.Point(136, 32);
this.labelShutdown.Name = "labelShutdown";
this.labelShutdown.Size = new System.Drawing.Size(136, 16);
this.labelShutdown.TabIndex = 8;
this.labelShutdown.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
//
// panelParent
//
this.panelParent.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.panelParent.Controls.Add(this.panelChild);
this.panelParent.Location = new System.Drawing.Point(8, 60);
this.panelParent.Name = "panelParent";
this.panelParent.Size = new System.Drawing.Size(288, 60);
this.panelParent.TabIndex = 6;
//
// panelChild
//
this.panelChild.Controls.Add(this.labelNow);
this.panelChild.Controls.Add(this.labelShutdown);
this.panelChild.Controls.Add(this.labelDateTimeShutdown);
this.panelChild.Controls.Add(this.labelDateTimeNow);
this.panelChild.Location = new System.Drawing.Point(0, 0);
this.panelChild.Name = "panelChild";
this.panelChild.Size = new System.Drawing.Size(280, 56);
this.panelChild.TabIndex = 8;
//
// buttonCancel
//
this.buttonCancel.Cursor = System.Windows.Forms.Cursors.Hand;
this.buttonCancel.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
this.buttonCancel.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.buttonCancel.Location = new System.Drawing.Point(176, 128);
this.buttonCancel.Name = "buttonCancel";
this.buttonCancel.Size = new System.Drawing.Size(56, 23);
this.buttonCancel.TabIndex = 4;
this.buttonCancel.Text = "取消&C";
this.buttonCancel.Click += new System.EventHandler(this.buttonCancel_Click);
//
// buttonInvoke
//
this.buttonInvoke.Cursor = System.Windows.Forms.Cursors.Hand;
this.buttonInvoke.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
this.buttonInvoke.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.buttonInvoke.Location = new System.Drawing.Point(240, 128);
this.buttonInvoke.Name = "buttonInvoke";
this.buttonInvoke.Size = new System.Drawing.Size(56, 23);
this.buttonInvoke.TabIndex = 3;
this.buttonInvoke.Text = "确定&O";
this.buttonInvoke.Click += new System.EventHandler(this.buttonInvoke_Click);
//
// checkBox
//
this.checkBox.Cursor = System.Windows.Forms.Cursors.Hand;
this.checkBox.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
this.checkBox.Location = new System.Drawing.Point(8, 128);
this.checkBox.Name = "checkBox";
this.checkBox.Size = new System.Drawing.Size(66, 24);
this.checkBox.TabIndex = 2;
this.checkBox.Text = "强制&B";
//
// TimerComputerShutdown
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
this.BackColor = System.Drawing.Color.GhostWhite;
this.ClientSize = new System.Drawing.Size(306, 159);
this.Controls.Add(this.checkBox);
this.Controls.Add(this.comboBox);
this.Controls.Add(this.labelWhatDoYouWantTheComputerToDo);
this.Controls.Add(this.panelParent);
this.Controls.Add(this.buttonCancel);
this.Controls.Add(this.buttonInvoke);
this.Controls.Add(this.dateTimePicker);
this.Controls.Add(this.labelSelectDateTimeToShutdownComputer);
this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
this.MaximizeBox = false;
this.Name = "TimerComputerShutdown";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "Timer Computer Shutdown";
this.TopMost = true;
this.Load += new System.EventHandler(this.TimerComputerShutdown_Load);
this.panelParent.ResumeLayout(false);
this.panelChild.ResumeLayout(false);
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new TimerComputerShutdown());
}

private void TimerComputerShutdown_Load(object sender, System.EventArgs e)
{
this.threadStart = new System.Threading.ThreadStart(Application_Tick);
this.thread = new System.Threading.Thread(threadStart);

this.panelChild.Visible = false;

this.dateTimePicker.Value = System.DateTime.Now;
}

protected override void OnClosing(CancelEventArgs e)
{
try
{
if (this.thread.IsAlive)
{
this.thread.Abort();
this.thread.Join();
}
}
catch (System.Threading.ThreadAbortException threadAbortException)
{
System.Threading.Thread.ResetAbort();
}
catch (System.Exception exception)
{

}
finally
{
System.Windows.Forms.Application.Exit();
}

base.OnClosing(e);
}

public void Computer_Shutdown()
{
if (this.checkBox.Checked)
{
System.Diagnostics.Process[] processes = System.Diagnostics.Process.GetProcesses();

foreach (System.Diagnostics.Process processParent in processes)
{
System.Diagnostics.Process[] processNames = System.Diagnostics.Process.GetProcessesByName(processParent.ProcessName);

foreach (System.Diagnostics.Process processChild in processNames)
{
try
{
System.IntPtr hWnd = processChild.MainWindowHandle;

if (IsIconic(hWnd))
{
ShowWindowAsync(hWnd, SW_RESTORE);
}

SetForegroundWindow(hWnd);

if (!(processChild.MainWindowTitle.Equals(this.Text)))
{
processChild.CloseMainWindow();
processChild.Kill();
processChild.WaitForExit();
}
}
catch (System.Exception exception)
{

}
}
}
}

System.Windows.Forms.Application.Exit();

switch (this.comboBox.SelectedIndex)
{
case 0:
WindowsController.ExitWindows(RestartOptions.PowerOff, false);
break;
case 1:
WindowsController.ExitWindows(RestartOptions.Reboot, false);
break;
case 2:
WindowsController.ExitWindows(RestartOptions.Suspend, false);
break;
case 3:
WindowsController.ExitWindows(RestartOptions.Hibernate, false);
break;
case 4:
WindowsController.ExitWindows(RestartOptions.LogOff, false);
break;
}
}

private void comboBox_SelectedIndexChanged(object sender, System.EventArgs e)
{
this.labelSelectDateTimeToShutdownComputer.Text = "选择任务" + " " + this.comboBox.SelectedItem.ToString() + " " + "时间:";
this.labelDateTimeShutdown.Text = "任务时间" + " " + this.comboBox.SelectedItem.ToString() + ":";
}

public bool dateTimePicker_Validated()
{
if (this.dateTimePicker.Value.CompareTo(System.DateTime.Now) < 0)
{
//Error error = new Error();
//error.ShowDialog();

this.dateTimePicker.Value = System.DateTime.Now;

return false;
}
else
{
return true;
}
}

private void dateTimePicker_ValueChanged(object sender, System.EventArgs e)
{
this.labelShutdown.Text = this.dateTimePicker.Value.ToString();
}

public void Application_Tick()
{
while (!(this.labelNow.Text.ToString().Equals(this.dateTimePicker.Value.ToString())))
{
this.labelNow.Text = System.DateTime.Now.ToString();
}

this.Computer_Shutdown();
}

private void buttonCancel_Click(object sender, System.EventArgs e)
{
try
{
if (this.thread.IsAlive)
{
this.thread.Abort();
this.thread.Join();
}
}
catch (System.Threading.ThreadStateException threadStateException)
{
System.Threading.Thread.ResetAbort();
}
catch (System.Exception exception)
{

}
finally
{
System.Windows.Forms.Application.Exit();
}
}

private void buttonInvoke_Click(object sender, System.EventArgs e)
{
if (this.dateTimePicker_Validated())
{
this.thread.Start();

this.comboBox.Enabled = false;
this.dateTimePicker.Enabled = false;
this.panelChild.Visible = true;
this.buttonInvoke.Enabled = false;
}
}
}
}

Answer 2

.net类库没有直接操作计算机重启的类库

你可以用Proccess类启动外部应用程序(比如shutdown)或者调用系统函数才可以
这种操作要求安全性很高,所以也不容易做到