Is user Administrator in c#

[Yoavo]

Hi,
I need to know if the current user is administrator.
The trivial methods does not work on Vista.

What is the correct way to get it ?

Yoav.

 

[Patrice]

Please be specific. Is WindowsPrincipal.IsInRole the trivial method you are
talking about ? Also define "does not work" ? What is your app behavior ?

I'm not that familiar with Vista and I don't have permanent access to Vista
but IMO it could be an UAC issue. That is even if the user is in the admin
group it doesn't mean that *at this time* it runs under the privilege you
need. You perhaps needs to add a manifest to your application to trigger the
UAC dialog...

 

[Yoavo]

This is the code I am using:

static bool IsAdmin()
{
AppDomain.CurrentDomain.SetPrincipalPolicy(
PrincipalPolicy.WindowsPrincipal);

// read current identity for this thread
WindowsPrincipal principal =
(WindowsPrincipal)Thread.CurrentPrincipal;
WindowsIdentity identity = (WindowsIdentity)principal.Identity;
// can the Administrator role be found?
bool isAdmin =
principal.IsInRole(WindowsBuiltInRole.Administrator);
return isAdmin;
}

It return false for a user that is an administrator.
I cant add manifest to my application because the program should run also
for users which are not administrators.

 

[Wilson, Phil]

A manifest doesn't mandate requiresAdministrator. It's possible that
level=highestavailable would work for you.

 

[Jesse Houwing]

* Wilson, Phil wrote, On 16-9-2009 20:00:

A manifest doesn't mandate requiresAdministrator. It's possible that
level=highestavailable would work for you.

Also have a look at this blog post:

http://www.itwriting.com/blog/198-c-code-to-detect-uac-elevation-on-vista.html

It contains a sample solution which uses the UAC API to check the
current Elevation level.

 

[Jesse Houwing]

* Wilson, Phil wrote, On 16-9-2009 20:00:

A manifest doesn't mandate requiresAdministrator. It's possible that
level=highestavailable would work for you.

This article might also be of use:

http://www.codeproject.com/KB/vista-security/UAC_Shield_for_Elevation.aspx

 

[Patrice]

It return false for a user that is an administrator.

In addition to other response this is actually documented :
http://msdn.microsoft.com/en-us/library/46ks97y7.aspx (make sense,
technicaly the user is not an administrator at this time).

Hopefully the workaround shown in other response will solve the rpoblem...