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Unable to cast object of type 'System.Security.Principal.GenericPrincipal' to type 'BusinessObjectLayer.CustomPrincipal'

Last post 04-13-2007 9:59 AM by scott@elbandit.co.uk. 2 replies.

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Unable to cast object of type 'System.Security.Principal.GenericPrincipal' to type 'BusinessObjectLayer.CustomPrincipal'

04-10-2007, 10:21 AM

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scott@elbandit.co.uk
Joined on 01-29-2007, 10:08 AM
Portsmouth, UK
Posts 1,749
Points 10,660

Any ideas why I get this message:

Server Error in '/' Application.

Unable to cast object of type 'System.Security.Principal.GenericPrincipal' to type 'BusinessObjectLayer.CustomPrincipal'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidCastException: Unable to cast object of type 'System.Security.Principal.GenericPrincipal' to type 'BusinessObjectLayer.CustomPrincipal'.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[InvalidCastException: Unable to cast object of type 'System.Security.Principal.GenericPrincipal' to type 'BusinessObjectLayer.CustomPrincipal'.]
   Customer_Orders.Page_Load(Object sender, EventArgs e) +60
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +47
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1061

Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.210

The error occurs here:

Private aCustomer As Customer

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
aCustomer = CType(HttpContext.Current.User, CustomPrincipal).Customer
End Sub

BusinessObjectLayer.CustomPrincipal is:

Imports System
Imports System.Security.Principal

'*********************************************************************
' CustomPrincipal Class
'
' The CustomPrincipal class implements the IPrincipal interface so it
' can be used in place of the GenericPrincipal object. Requirements for
' implementing the IPrincipal interface include implementing the
' IIdentity interface and an implementation for IsInRole. The custom
' principal is attached to the current request in Global.asax in the
' Authenticate_Request event handler. The user's role is stored in the
' custom principal object in the Global_AcquireRequestState event handler.
''*********************************************************************

Public

Class CustomPrincipal
Implements IPrincipal

Private _userRole As String = [String].Empty
Private _aCustomer As Customer

' Required to implement the IPrincipal interface.
Protected _Identity As IIdentity

Public Sub New()

End Sub 'New

Public Sub New(ByVal identity As IIdentity, ByVal aCustomer As Customer)

_Identity = identity

_aCustomer = aCustomer

End Sub 'New

' IIdentity property used to retrieve the Identity object attached to
' this principal.

Public ReadOnly Property Identity() As IIdentity Implements IPrincipal.Identity
Get

Return _Identity
End Get
End Property

Public Property UserRole() As String
   Get
       Return _userRole
   End Get
   Set(ByVal Value As String)
      _userRole = Value
   End Set
End Property

' The Customer Object
Public Property Customer() As Customer
    Get
        Return _aCustomer
    End Get
    Set(ByVal Value As Customer)
      _aCustomer = Value
    End Set
End Property

Public Function IsInRole(ByVal role As String) As Boolean Implements IPrincipal.IsInRole
Return True
End Function 'IsInRole

End

Class 'CustomPrincipal

This is the code in Global.asax

Sub Application_AuthenticateRequest(ByVal sender As Object, ByVal e As EventArgs)

' Fires upon attempting to authenticate the user
If Request.IsAuthenticated = True Then

Dim objCP As New CustomPrincipal

' We need to get all information on the user and store it in our
' Custom principal object

             If HttpContext.Current.Cache(HttpContext.Current.User.Identity.Name) Is Nothing Then
                   ' Add our own custom principal to the request containing the user's identity, the user id, and~
                   ' the User's role

objCP =

New CustomPrincipal(User.Identity, CustomerFunctions.getCustomerDetails(User.Identity.Name))

Context.User = objCP

HttpContext.Current.Cache.Insert(HttpContext.Current.User.Identity.Name, objCP,

Nothing, Now.AddMinutes(10), Nothing)

Else

objCP =

CType(HttpContext.Current.Cache(HttpContext.Current.User.Identity.Name), CustomPrincipal)

                     Try
                             Context.User = objCP
                     Catch ex As Exception

End Try

End If

End Sub

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Re: Unable to cast object of type 'System.Security.Principal.GenericPrincipal' to type 'BusinessObjectLayer.CustomPrincipal'

04-12-2007, 7:53 AM

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XiaoYong Dai – MSFT
Joined on 03-19-2007, 11:22 AM
Posts 4,229
Points 38,306

Use your code to create a new website and it looks pretty well, I didn't receive any error.

The only change I've made is setting the CustomerFunctions.getCustomerDetails(User.Identity.Name) to New Customer , but it doesn't matter, right?

BTW: I use VS 2005 and .net v2.0.50727.

Anyway, I guess it may because mismatched DLL versions. For detail information, please see this link and hope it helps

http://p2p.wrox.com/TopicIndex/38283.htm

This response contains a reference to a third party World Wide Web site. Microsoft is providing this information as a convenience to you. Microsoft does not control these sites and has not tested any software or information found on these sites; therefore, Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. There are inherent dangers in the use of any software found on the Internet, and Microsoft cautions you to make sure that you completely understand the risk before retrieving any software from the Internet.

Best Regards
XiaoYong Dai
Microsoft Online Community Support

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Re: Unable to cast object of type 'System.Security.Principal.GenericPrincipal' to type 'BusinessObjectLayer.CustomPrincipal'

04-13-2007, 9:59 AM

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scott@elbandit.co.uk
Joined on 01-29-2007, 10:08 AM
Portsmouth, UK
Posts 1,749
Points 10,660

hello XiaoYong Dai

The problem appears to be that the Global.asax events were not firing. I have changed nothing in the Global.asax, I didn't touched the PrecompiledApp.config in the root of the site either. Do you know what could have caused this to stop working?

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