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ClientRoleProvider Class

Gets role information for Windows-based applications from an ASP.NET AJAX roles service.

Namespace:  System.Web.ClientServices.Providers
Assembly:  System.Web.Extensions (in System.Web.Extensions.dll)

Public Class ClientRoleProvider _
	Inherits RoleProvider
Dim instance As ClientRoleProvider

You can use client application services to retrieve role information from an existing roles service by configuring your application to use the ClientRoleProvider class. After configuration, you can determine whether an authenticated user is in a particular role by calling the IsInRole method of the IPrincipal returned by the static Thread.CurrentPrincipal property. For applications configured to use client application services, this property returns a ClientRolePrincipal. Because this class implements the IPrincipal interface, you do not need to reference it explicitly. The ClientRolePrincipal.IsInRole method internally calls the ClientRoleProvider.IsUserInRole method.

The ClientRoleProvider class is a read-only role membership provider that retrieves role information for authenticated users from the roles service indicated by the ServiceUri property. The value of the ServiceUri property is typically retrieved from the application configuration file along with other configuration values. For more information, see How to: Configure Client Application Services.

You can retrieve the current ClientRoleProvider instance through the static Roles.Provider property.

The ClientRoleProvider class supports only the GetRolesForUser and IsUserInRole methods of the RoleProvider abstract class. When you call one of these methods for a particular user, the service provider first checks the local data cache for role information. If the cache does not contain any role information or the cache has expired, the service provider retrieves the role information from the roles service and adds it to the cache.

You can specify the time-out period for the roles cache when you configure client application services. To force the GetRolesForUser method to retrieve role data from the service instead of the local cache, call the ResetCache method first.

You cannot use the ClientRoleProvider class to create or delete roles, or to modify the role membership of users. To create or modify role information, you must change the configuration of the role service on the server.

The following example code demonstrates how to use this property to programmatically set the roles service location.

Private Sub SetRolesServiceLocation()
    CType(System.Web.Security.Roles.Provider,  _
        ClientRoleProvider).ServiceUri = _
End Sub


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

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

.NET Framework

Supported in: 3.5