Thread.CurrentPrincipal Property

Gets or sets the thread's current principal (for role-based security).

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

Public Shared Property CurrentPrincipal As IPrincipal
Dim value As IPrincipal

value = Thread.CurrentPrincipal

Thread.CurrentPrincipal = value
/** @property */
public static IPrincipal get_CurrentPrincipal ()

/** @property */
public static void set_CurrentPrincipal (IPrincipal value)

public static function get CurrentPrincipal () : IPrincipal

public static function set CurrentPrincipal (value : IPrincipal)

Not applicable.

Property Value

An IPrincipal value representing the security context.

Exception typeCondition


The caller does not have the permission required to set the principal.

The following code example shows how to set and retrieve the principal of a thread.

Option Explicit
Option Strict

Imports Microsoft.VisualBasic
Imports System
Imports System.Security
Imports System.Security.Permissions
Imports System.Security.Principal
Imports System.Threading

' Request permission to set thread principal.
<Assembly: SecurityPermissionAttribute( _
    SecurityAction.RequestOptional, ControlPrincipal := True)>

Public Class Principal

    <MTAThread> _
    Shared Sub Main()
        Dim rolesArray As String() = {"managers", "executives"}
            ' Set the principal to a new generic principal.
            Thread.CurrentPrincipal = _
                New GenericPrincipal(New GenericIdentity( _
                "Bob", "Passport"), rolesArray)

        Catch secureException As SecurityException
            Console.WriteLine("{0}: Permission to set Principal " & _
                "is denied.", secureException.GetType().Name)
        End Try

        Dim threadPrincipal As IPrincipal = Thread.CurrentPrincipal
        Console.WriteLine( _
            "Name: {0}" & vbCrLf & "IsAuthenticated:" & _
            " {1}" & vbCrLf & "AuthenticationType: {2}", _
            threadPrincipal.Identity.Name, _
            threadPrincipal.Identity.IsAuthenticated, _
    End Sub
End Class

import System.*;
import System.Security.*;
import System.Security.Permissions.*;
import System.Security.Principal.*;
import System.Threading.*;
import System.Threading.Thread;
import System.Security.SecurityManager;

// Request permission to set thread principal.
/** @class.assembly SecurityPermissionAttribute(SecurityAction.RequestOptional,
     ControlPrincipal = true)

class Principal
    public static void main(String[] args)
        String rolesArray[] = new String[] { "managers", "executives" };

        try {
            // Set the principal to a new generic principal.
            Thread.set_CurrentPrincipal(new GenericPrincipal
                (new GenericIdentity("Bob", "Passport"), rolesArray));
        catch (SecurityException secureException) {
            Console.WriteLine("{0}: Permission to set Principal " +
                "is denied.", secureException.GetType().get_Name());

        IPrincipal threadPrincipal = Thread.get_CurrentPrincipal();
        Console.WriteLine("Name: {0}\nIsAuthenticated: {1}" +
            "\nAuthenticationType: {2}",
    } //main
} //Principal

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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