RE: Thread.CurrentPrincipal

Hi Peter,

If you want to use Windows role-based authentication in your application,
then yes, you have to set the CurrentPrincipal to a WindowsPrincipal. The
Thread itself will not do it automatically for you because it doesn't know
what kind of authentication you want to use in your application.

Visual Basic.NET provides an Application Framework that does the same thing
based on the project setting. Then in its WindowsFormsApplicationBase
class's .ctor, it does something like this:

public WindowsFormsApplicationBase(AuthenticationMode authenticationMode)
{
    this.m_MinimumSplashExposure = 0x7d0;
    this.m_SplashLock = new object();
    this.m_NetworkAvailChangeLock = new object();
    this.m_Ok2CloseSplashScreen = true;
    this.ValidateAuthenticationModeEnumValue(authenticationMode,
"authenticationMode");
    if (authenticationMode == AuthenticationMode.Windows)
    {
        try
        {
            Thread.CurrentPrincipal = new
WindowsPrincipal(WindowsIdentity.GetCurrent());
        }
        catch (SecurityException)
        {
        }
    }
    this.m_AppContext = new WinFormsAppContext(this);
    new UIPermission(UIPermissionWindow.AllWindows).Assert();
    this.m_AppSyncronizationContext =
AsyncOperationManager.SynchronizationContext;
    AsyncOperationManager.SynchronizationContext = new
WindowsFormsSynchronizationContext();
    PermissionSet.RevertAssert();
}

C# doesn't provide such a framework directly (of course you can inherit
from the VB one and make your own); so you need to do it yourself.

Hope this makes it clear.

If you have any futher questions, please kindly let me know.

Thanks,
Jie Wang

Microsoft Online Community Support

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