Thread.CurrentPrincipal Property

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

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

public static IPrincipal CurrentPrincipal { get; set; }
/** @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)

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.

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

// Request permission to set thread principal.
[assembly: SecurityPermissionAttribute(
    SecurityAction.RequestOptional, ControlPrincipal = true)]
class Principal
    static void Main()
        string[] rolesArray = {"managers", "executives"};
            // Set the principal to a new generic principal.
            Thread.CurrentPrincipal = 
                new GenericPrincipal(new GenericIdentity(
                "Bob", "Passport"), rolesArray);
        catch(SecurityException secureException)
            Console.WriteLine("{0}: Permission to set Principal " +
                "is denied.", secureException.GetType().Name);

        IPrincipal threadPrincipal = Thread.CurrentPrincipal;
        Console.WriteLine("Name: {0}\nIsAuthenticated: {1}" +
            "\nAuthenticationType: {2}", 

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 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

Community Additions