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FormsAuthenticationModule Class

Sets the identity of the user for an ASP.NET application when forms authentication is enabled. This class cannot be inherited.

System.Object
  System.Web.Security.FormsAuthenticationModule

Namespace:  System.Web.Security
Assembly:  System.Web (in System.Web.dll)

'Declaration
Public NotInheritable Class FormsAuthenticationModule _
	Implements IHttpModule

The FormsAuthenticationModule type exposes the following members.

  NameDescription
Public methodFormsAuthenticationModuleInitializes a new instance of the FormsAuthenticationModule class.
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  NameDescription
Public methodDisposeReleases all resources, other than memory, used by the FormsAuthenticationModule.
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodInitInitializes the FormsAuthenticationModule object.
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Public eventAuthenticateOccurs when the application authenticates the current request.
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The FormsAuthenticationModule sets the current HttpContext.User property to an IPrincipal object that represents the user identity for the current request when the authentication Mode is set to Forms in the authentication Element (ASP.NET Settings Schema) element of the application's configuration file.

The FormsAuthenticationModule exposes an Authenticate event that enables you to provide a custom IPrincipal object for the User property of the current HttpContext. The Authenticate event is accessed by specifying a subroutine named FormsAuthentication_OnAuthenticate in the Global.asax file for your ASP.NET application.

NoteNote

In IIS 7.0, using the WindowsAuthenticationModule with the FormsAuthenticationModule is not supported. For more information about compatibility issues in Integrated modes, see Moving an ASP.NET Application from IIS 6.0 to IIS 7.0.

The following example uses the FormsAuthentication_OnAuthenticate event to set the User property of the current HttpContext to a custom IPrincipal object.

Public Sub FormsAuthentication_OnAuthenticate(sender As Object, _
                                              args As FormsAuthenticationEventArgs)
  If FormsAuthentication.CookiesSupported Then
    If Not Request.Cookies(FormsAuthentication.FormsCookieName) Is Nothing Then
      Try
        Dim ticket As FormsAuthenticationTicket = FormsAuthentication.Decrypt( _
          Request.Cookies(FormsAuthentication.FormsCookieName).Value)

        args.User = New System.Security.Principal.GenericPrincipal( _
          New Samples.AspNet.Security.MyFormsIdentity(ticket), _
          New String(0) {})
      Catch e As HttpException
        ' Decrypt method failed.
      End Try
    End If
  Else
      Throw New Exception("Cookieless Forms Authentication is not " & _
                            "supported for this application.")
  End If
End Sub

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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