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AppDomain.SetThreadPrincipal Method

.NET Framework 4

Sets the default principal object to be attached to threads if they attempt to bind to a principal while executing in this application domain.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

Syntax

C++

Copy

[SecurityPermissionAttribute(SecurityAction.Demand, Flags = SecurityPermissionFlag.ControlPrincipal)]
public void SetThreadPrincipal(
	IPrincipal principal
)

Parameters

principal: Type: System.Security.Principal.IPrincipal
The principal object to attach to threads.

Implements

_AppDomain.SetThreadPrincipal(IPrincipal)

Exceptions

Exception	Condition
ArgumentNullException	principal is null.
PolicyException	The thread principal has already been set.
AppDomainUnloadedException	The operation is attempted on an unloaded application domain.

Examples

The following example shows the effect of using the SetThreadPrincipal method to change the principal that is available for attaching to threads that are executing in the application domain. It also shows the effect on threads of using the SetPrincipalPolicy method to change the principal policy of the application domain.

C++

Copy


using System;
using System.Security.Principal;
using System.Threading;

class ADPrincipal
{
	static void Main(string[] args)
	{
		// Create a new thread with a generic principal.
		Thread t = new Thread(new ThreadStart(PrintPrincipalInformation));
		t.Start();
		t.Join();

		// Set the principal policy to WindowsPrincipal.
		AppDomain currentDomain = AppDomain.CurrentDomain;
		currentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);
			
		// The new thread will have a Windows principal representing the
		// current user.
		t = new Thread(new ThreadStart(PrintPrincipalInformation));
		t.Start();
		t.Join();

		// Create a principal to use for new threads.
		IIdentity identity = new GenericIdentity("NewUser");
		IPrincipal principal = new GenericPrincipal(identity, null);
		currentDomain.SetThreadPrincipal(principal);
			
		// Create a new thread with the principal created above.
		t = new Thread(new ThreadStart(PrintPrincipalInformation));
		t.Start();
		t.Join();
		
		// Wait for user input before terminating.
		Console.ReadLine();
	}

	static void PrintPrincipalInformation()
	{
		IPrincipal curPrincipal = Thread.CurrentPrincipal;
		if(curPrincipal != null)
		{
			Console.WriteLine("Type: " + curPrincipal.GetType().Name);
			Console.WriteLine("Name: " + curPrincipal.Identity.Name);
			Console.WriteLine("Authenticated: " +
				curPrincipal.Identity.IsAuthenticated);
			Console.WriteLine();
		}
	}
}

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET Framework Security

SecurityPermission
for ability to manipulate the principal object. Associated enumeration: SecurityPermissionFlag.ControlPrincipal. Security action: Demand.

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

AppDomain Class

System Namespace

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Community Content Add

FAQ

"Default principal object cannot be set twice"

http://the-tread-way.blogspot.pt/2010/05/supporting-multiple-logins-in-windows.html

History

5/17/2012
Manuel Alves