How do I shutdown the computer?

Question

How to shutdown my computer using C#?

Duplicate of http://stackoverflow.com/questions/102567/how-to-shutdown-the-computer-from-c — sharptooth, Mar 20 '09 at 09:19

score 10 · Answer 1 · answered Mar 20 '09 at 08:59

10

An easy way: Use Process.Start to run shutdown.exe.

  shutdown /s /t 0

Programmatic way: P/Invoke a call to ExitWindowsEx

This would be the P/Invoke signature:

[DllImport("aygshell.dll", SetLastError="true")]
private static extern bool ExitWindowsEx(uint dwFlags, uint dwReserved);

Under all circumstances, the user running the code will need shutdown system privileges (normally not a problem, but an important point to remember).

answered Mar 20 '09 at 08:59

driis

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Would you say a bit about how a person would choose between the two methods? Or is it just easy vs not so easy? – J M Mar 20 '09 at 09:20
I would nromally go for the second option in production software, as it gives you more control (shutdown reasons, etc). It takes a bit longer to implement, since I would need to lookup the correct flag and the signature. – driis Mar 20 '09 at 09:30

score 5 · Answer 2 · answered Mar 20 '09 at 09:15

5

Different methods:

A. System.Diagnostics.Process.Start("Shutdown", "-s -t 10");

B. Windows Management Instrumentation (WMI)

http://www.csharpfriends.com/Forums/ShowPost.aspx?PostID=36953

http://www.dreamincode.net/forums/showtopic33948.htm

C. System.Runtime.InteropServices Pinvoke

http://bytes.com/groups/net-c/251367-shutdown-my-computer-using-c

D. System Management

http://www.geekpedia.com/code36_Shut-down-system-using-Csharp.html

After I submit, I have seen so many others also have posted...

answered Mar 20 '09 at 09:15

lakshmanaraj

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Although saying that I am still thinking - when would a person not just usethe first option? – J M Mar 20 '09 at 09:26
I am not sure whether some one can disable rights for execution of shutdown.exe, in that case, one might need code to execute... – lakshmanaraj Mar 20 '09 at 09:50
aren't B and D the same method? (WMI) – Lucas Jun 18 '10 at 17:41
@Lucas, Eventhough both are WMI, invoking method names differ from each other. – lakshmanaraj Jun 20 '10 at 01:25

score 4 · Answer 3 · answered Mar 20 '09 at 09:21

WindowsController is a c# wrapper class around ExitWindowsEx.

Sometimes you need to restart or shutdown the operating system from your applications (for instance, after the installation of a program). The .NET framework offers you an indirect way to restart the computer through the Windows Management Instrumentation (WMI) classes in the System.Management namespace, however, there seem to be some problems in their implementation.

That's why we created the WindowsController class that implements some API functions to restart and shutdown Windows. It supports all the ExitWindowsEx modes and it can also hibernate and suspend the system.

This class is available in C# and VB.NET version. It can be compiled to a .NET module or to a library to be used from other .NET languages. Since it relies on the Windows API, it will not work on Linux or FreeBSD.

(mentalis.org)

For those who want to know, the code is in open source under a variant of the BSD license. — Mike Rosoft, Sep 23 '20 at 12:27

score 1 · Answer 4 · edited May 23 '17 at 11:44

1

Use a variation of the "user logoff" code shown here.

That code uses the ExitWindowsEx API call.

edited May 23 '17 at 11:44

Community

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answered Mar 20 '09 at 09:03

Alnitak

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score 0 · Answer 5 · answered Nov 04 '15 at 12:22

You could also use InitiateSystemShutdown

http://www.pinvoke.net/default.aspx/advapi32.initiatesystemshutdown

using System;
using System.Runtime.InteropServices;
using System.Text;

public class Program
{
    [DllImport( "advapi32.dll" ) ]
    public static extern bool InitiateSystemShutdown( string MachineName , string Message , uint Timeout , bool AppsClosed , bool Restart );

    [DllImport( "kernel32.dll" ) ]
    public static extern uint GetLastError();

    [DllImport( "kernel32.dll" ) ]
    public static extern uint FormatMessage( uint Flags , IntPtr Source , uint MessageID , uint LanguageID , StringBuilder Buffer , uint Size , IntPtr Args );



    public static void Main()
    {
        InitiateSystemShutdown(System.Environment.MachineName, "hello", 0, false, false);
        //InitiateSystemShutdown("localhost", "hello", 0, false, false);

    }
}

score 0 · Answer 6 · answered Mar 20 '09 at 09:00

0

At a guess (untested):

Process.Start("shutdown", "-s -t 0");

answered Mar 20 '09 at 09:00

Marc Gravell

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score 0 · Answer 7 · answered Mar 20 '09 at 09:07

0

The hard way, works on laptops perfectly, although it takes some time:

Spawn a couple endless loops in more threads than cpu cores.
Wait for overheat which will automatically shutdown a computer.

:)

answered Mar 20 '09 at 09:07

Marko

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So many downvotes! Was it just me who found the answer amusing? – Marcel Mar 20 '09 at 09:30

How do I shutdown the computer?

7 Answers7