AppDomain.SetThreadPrincipal(IPrincipal) Method

Definition

Namespace:

System

Assembly:

System.Runtime.dll

Source:

AppDomain.cs

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

public:
 void SetThreadPrincipal(System::Security::Principal::IPrincipal ^ principal);

public void SetThreadPrincipal (System.Security.Principal.IPrincipal principal);

member this.SetThreadPrincipal : System.Security.Principal.IPrincipal -> unit

Public Sub SetThreadPrincipal (principal As IPrincipal)

Parameters

principal

IPrincipal

The principal object to attach to threads.

Exceptions

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.

using namespace System;
using namespace System::Security::Principal;
using namespace System::Threading;
ref class ADPrincipal
{
public:
   static void PrintPrincipalInformation()
   {
      IPrincipal^ curPrincipal = Thread::CurrentPrincipal;
      if ( curPrincipal != nullptr )
      {
         Console::WriteLine( "Type: {0}", curPrincipal->GetType()->Name );
         Console::WriteLine( "Name: {0}", curPrincipal->Identity->Name );
         Console::WriteLine( "Authenticated: {0}", curPrincipal->Identity->IsAuthenticated );
         Console::WriteLine();
      }
   }

};

int main()
{
   
   // Create a new thread with a generic principal.
   Thread^ t = gcnew Thread( gcnew ThreadStart( ADPrincipal::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 = gcnew Thread( gcnew ThreadStart( ADPrincipal::PrintPrincipalInformation ) );
   t->Start();
   t->Join();
   
   // Create a principal to use for new threads.
   IIdentity^ identity = gcnew GenericIdentity( "NewUser" );
   IPrincipal^ principal = gcnew GenericPrincipal( identity,nullptr );
   currentDomain->SetThreadPrincipal( principal );
   
   // Create a new thread with the principal created above.
   t = gcnew Thread( gcnew ThreadStart( ADPrincipal::PrintPrincipalInformation ) );
   t->Start();
   t->Join();
   
   // Wait for user input before terminating.
   Console::ReadLine();
}

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();
        }
    }
}

open System
open System.Security.Principal
open System.Threading

let printPrincipalInformation () =
    let curPrincipal = Thread.CurrentPrincipal
    if curPrincipal <> null then
        printfn $"Type: {curPrincipal.GetType().Name}"
        printfn $"Name: {curPrincipal.Identity.Name}"
        printfn $"Authenticated: {curPrincipal.Identity.IsAuthenticated}\n"

[<EntryPoint>]
let main _ =
    // Create a new thread with a generic principal.
    let t = Thread(ThreadStart printPrincipalInformation)
    t.Start()
    t.Join()

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

    // Create a principal to use for new threads.
    let identity = GenericIdentity "NewUser"
    let principal = GenericPrincipal(identity, null)
    currentDomain.SetThreadPrincipal principal
        
    // Create a new thread with the principal created above.
    let t = Thread(ThreadStart printPrincipalInformation)
    t.Start()
    t.Join()

    // Wait for user input before terminating.
    Console.ReadLine() |> ignore
    0

Imports System.Security.Principal
Imports System.Threading

Class ADPrincipal
    Overloads Shared Sub Main(ByVal args() As String)
        ' Create a new thread with a generic principal.
        Dim t As New Thread(New ThreadStart(AddressOf PrintPrincipalInformation))
        t.Start()
        t.Join()

        ' Set the principal policy to WindowsPrincipal.
        Dim currentDomain As AppDomain = AppDomain.CurrentDomain
        currentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal)

        ' The new thread will have a Windows principal representing the
        ' current user.
        t = New Thread(New ThreadStart(AddressOf PrintPrincipalInformation))
        t.Start()
        t.Join()

        ' Create a principal to use for new threads.
        Dim identity = New GenericIdentity("NewUser")
        Dim principal = New GenericPrincipal(identity, Nothing)
        currentDomain.SetThreadPrincipal(principal)

        ' Create a new thread with the principal created above.
        t = New Thread(New ThreadStart(AddressOf PrintPrincipalInformation))
        t.Start()
        t.Join()

        ' Wait for user input before terminating.
        Console.ReadLine()
    End Sub


    Shared Sub PrintPrincipalInformation()
        Dim curPrincipal As IPrincipal = Thread.CurrentPrincipal
        If Not (curPrincipal Is Nothing) Then
            Console.WriteLine("Type: " & CType(curPrincipal, Object).GetType().Name)
            Console.WriteLine("Name: " & curPrincipal.Identity.Name)
            Console.WriteLine("Authenticated: " & curPrincipal.Identity.IsAuthenticated)
            Console.WriteLine()

        End If
    End Sub
End Class