Re: Which is the best way to shutdown, reboot, or logoff from the system in C# (.NEt 4.0)? - C# Discussion Boards

Re: Running an exe file ( I mean a program) from inside my own program

14-Jan-11 4:07

He did. It's your job as a programmer to understand the classes you're using. Read the documentation on the Process class and you'll probably end up learning a lot about the Process class instead of knowing just the single little use case that someone gives you in a code sample.

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JF201514-Jan-11 2:00

JF2015

14-Jan-11 2:00

You should have a look at the System.Diagnostics.Process class.
See here for more information:
http://msdn.microsoft.com/en-us/library/system.diagnostics.process.start(v=VS.80).aspx[^]

Which is the best way to shutdown, reboot, or logoff from the system in C# (.NEt 4.0)?

Erik14-Jan-11 0:16

Erik

14-Jan-11 0:16

Hi,

I have to write an application that has the ability to perform a system-restart, shutdown or user-logoff. So far, I have found two solutions to do it, which both work very well. I'd like to know which is the best way to do it, i.e. if there are any disadvantages to the one or the other way to do it. Which is the most professional way to deal with it?

Currently, I use the System.Management Namespace, whic looks like the most elegant way to do this to me:

ManagementBaseObject mboShutdown = null;
            using (ManagementClass mcWin32 = new ManagementClass("Win32_OperatingSystem"))
            {
                mcWin32.Get();
                mcWin32.Scope.Options.EnablePrivileges = true;
                ManagementBaseObject ShutdownParams = mcWin32.GetMethodParameters("Win32Shutdown");                
                ShutdownParams["Flags"] = "1";
                ShutdownParams["Reserved"] = "0";
                foreach (ManagementObject manObj in mcWin32.GetInstances())
                {
                    mboShutdown = manObj.InvokeMethod("Win32Shutdown", ShutdownParams, null);
                }
                ret = true;
            }

On the other hand, I have found many users who load the appropriate system-DLLs, and perform the whole tsak "unmanaged", an call ExitWindowsEx from these DLLs. This works too, but I am wondering why people decide to do it this way, if there is a namespace available in .NET that actually does it, like in my example above.

Which way would you chose, and why?

Re: Which is the best way to shutdown, reboot, or logoff from the system in C# (.NEt 4.0)?

Luc Pattyn14-Jan-11 0:33

Luc Pattyn

14-Jan-11 0:33

I have used neither one. I think I once used something akin to "Process.Start("shutdown").

Smile | :)

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Re: Which is the best way to shutdown, reboot, or logoff from the system in C# (.NEt 4.0)?

Ravi Sant14-Jan-11 1:50

Ravi Sant

14-Jan-11 1:50

The un-managed code is not recommended one in long term, although it is faster way to achieve same.

With managed, good way is:

using System.Diagnostics;

ProcessStartInfo startinfo = new ProcessStartInfo("shutdown.exe","-r");

Process.Start(startinfo);

Keep in mind the options you want to use:

-i Display GUI interface, must be the first option

-l Log off (cannot be used with -m option)

-s Shutdown the computer

-r Shutdown and restart the computer

-a Abort a system shutdown

-m \\computername Remote computer to shutdown/restart/abort

-t xx Set timeout for shutdown to xx seconds

-c "comment" Shutdown comment (maximum of 127 characters)

-f Forces running applications to close without warning

-d [u][p]:xx:yy The reason code for the shutdown, u is the user code, p is a planned shutdown code, xx is the major reason code (positive integer less than 256)
,yy is the minor reason code (positive integer less than 65536)

Re: Which is the best way to shutdown, reboot, or logoff from the system in C# (.NEt 4.0)?

Dave Kreskowiak14-Jan-11 4:01

Re: Which is the best way to shutdown, reboot, or logoff from the system in C# (.NEt 4.0)?

14-Jan-11 4:01

RaviSant wrote:
The un-managed code is not recommended one in long term

Got a citation for this??

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jschell14-Jan-11 9:58

jschell

14-Jan-11 9:58

Dave Kreskowiak wrote:
Got a citation for this??

Certainly is something I try to avoid since incorrect usage of interop or even the unmanaged itself code can cause an OS system exception thus exiting the app. That behavior is not acceptable in a server application. Probably not something that one wants to occur in any app as well.

The following certainly would suggest that there are reasons that one might want to look for other options.

http://msdn.microsoft.com/en-us/library/ms973872.aspx#manunman_topic4[^]

Re: Which is the best way to shutdown, reboot, or logoff from the system in C# (.NEt 4.0)?

Dave Kreskowiak14-Jan-11 4:05

Getting network drives names issue

14-Jan-11 4:05

The most direct and rock solid way to do it, with the greatest amount of control, is ExitWindowsEx. I don't like using WMI because it has a habit of silently commiting suicide and you're left wondering why your call that used to work fine suddenly fails with cryptic errors, like "RPC Server unavailable".

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Priya Prk13-Jan-11 21:34

13-Jan-11 21:34

Dear all,

Im using this code to get the names of shared network drives in my computer:

DriveInfo[] allDrives = DriveInfo.GetDrives();
            foreach (DriveInfo d in allDrives)
            {
                if (d.DriveType == DriveType.Network)
                {
                    Response.Write(d.Name);
                }
            }

In win xp this works fine, but in windows7 i can only see the local drives.

Any idea why ? and how to solve this?

Thanks in advance.

RaviRanjanKr13-Jan-11 22:24

RaviRanjanKr

13-Jan-11 22:24

Priya Prk wrote:
In win xp this works fine, but in windows7 i can only see the local drives.

how that is possible to see the local drives after using given code. It will display only when you will use DriveType.Fixed [as I know]

Check your code it only display Network Drives Name not LocalDrives Name because Response.Write(d.Name)
only works and print the Name of Drives when DriveType will equals to DriveType.Network

Take a look you've applied condition.

Priya Prk wrote:
if (d.DriveType == DriveType.Network)
{
Response.Write(d.Name);
}

modified on Friday, January 14, 2011 5:19 AM

OriginalGriff13-Jan-11 22:41

OriginalGriff

13-Jan-11 22:41

I think what he means is that d.DriveType == DriveType.Network is never true under Windows 7, while it is under Windows XP. If you look, the OP does say that the code works under XP...

Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.

Priya Prk13-Jan-11 23:07

13-Jan-11 23:07

Hi all,

My bad.
OriginaGriff is right.. DriveType.Network is never true.

Goutam Patra13-Jan-11 23:04

Goutam Patra

13-Jan-11 23:04

I have checked your code but it works in Windows 7 also!

Priya Prk13-Jan-11 23:09

13-Jan-11 23:09

Hi Goutam Patra,

It does not work in my envoirment. i can see the drives in windowns explorer , but not with my code.

And if i try to read a file from a directory in network drive(i have read permissions) , im getting:

Could not find a part of the path \\network\dir

RaviRanjanKr13-Jan-11 23:14

RaviRanjanKr

13-Jan-11 23:14

Goutam Patra wrote:
I have checked your code but it works in Windows 7 also!

are you sure you are able to see Network Drive as well as Local Drive by using OP codes.

Goutam Patra13-Jan-11 23:25

Goutam Patra

13-Jan-11 23:25

Absolutely.

Pete O'Hanlon13-Jan-11 23:21

Pete O'Hanlon

13-Jan-11 23:21

Try using WMI instead. The following code should get a list of network drives:

public static List<string> FindNetworkDrives()
{
  List<string> networkDrives = new List<string>();
  SelectQuery query = new SelectQuery("select name from win32_logicaldisk where drivetype=4");
  ManagementObjectSearcher searcher = new ManagementObjectSearcher(query);
  foreach (ManagementObject obj in searcher.Get())
  {
    networkDrives.Add(obj["Name"]);
  }
  return networkDrives;
}

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Priya Prk13-Jan-11 23:32

13-Jan-11 23:32

Hi Pete O'Hanlon,

I did try your code, but unfortunately still no results.

Luc Pattyn14-Jan-11 1:41

Luc Pattyn

14-Jan-11 1:41

My guess would be you have a problem with permissions on your Win7 machine; nothing wrong with all the code you tried.

Smile | :)

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Priya Prk14-Jan-11 2:01

14-Jan-11 2:01

I think also it had to do with permissions, but dont understand how,

i tried to get files via asp.net fileupload control from those network drives, no problems...but when i try to read the same file with StreamReader im getting again that error.

Dave Kreskowiak14-Jan-11 4:00

14-Jan-11 4:00

Uhhh, what? How does a web app fit into all this?? There's something you're not telling us that's affecting this problem or causing it.

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