Getting UPN from wpf application

Question

Getting UPN from wpf application

SeekAzure 1

I have an WPF application which needs to get the User principal Name to do some authentications.
I am using .Net core 3.1 .

How can I do it ?

I have tried using System.DirectoryServices.AccountManagement.UserPrincipal.Current.UserPrincipalName;

but this always throws exception of type

System.InvalidCastException
HResult=0x80004002
Message=Unable to cast object of type 'System.DirectoryServices.AccountManagement.GroupPrincipal' to type 'System.DirectoryServices.AccountManagement.UserPrincipal'.
Source=System.DirectoryServices.AccountManagement
StackTrace:
at System.DirectoryServices.AccountManagement.UserPrincipal.FindByIdentity(PrincipalContext context, IdentityType identityType, String identityValue)
at System.DirectoryServices.AccountManagement.UserPrincipal.get_Current()

Jack J Jun 25,306 Reputation points

2022-08-17T03:01:58.07+00:00

@SeekAzure ,Welcome to Microsoft Q&A, based on my test, there is no error for me just with the code you provided. According to the exception, you are converting GroupPrincipal to UserPrincipal. Could you provide the related code about it?
SeekAzure 1 Reputation point

2022-08-17T16:59:42.403+00:00

Hi ,

I have just used it like this in my code.

var upn = System.DirectoryServices.AccountManagement.UserPrincipal.Current.UserPrincipalName;

I have even tried to Just get the System.DirectoryServices.AccountManagement.UserPrincipal.Current , even this throws the same exception.
Jack J Jun 25,306 Reputation points

2022-08-19T05:50:50.607+00:00

@SeekAzure , thanks for the feedback, the error may due to different references has the same class name to cause the conflict. I only installed nuget-package System.DirectoryServices.AccountManagement and it works well for me by using the code you provided. Could you tell me which references you added?
Like the following:
SeekAzure 1 Reputation point

2022-08-19T07:56:10.437+00:00

Hi @Jack J Jun here is the list
Jack J Jun 25,306 Reputation points

2022-08-19T09:16:43.98+00:00
@SeekAzure , thanks for the feedback, I installed the above nuget-packages and I didn't reproduce your problem. I would like to ask if there are any other references to your project. As usual, the following code will not generate the exception you mentioned because you have specified the type using the var keyword.

var upn = System.DirectoryServices.AccountManagement.UserPrincipal.Current.UserPrincipalName;

I recommend that you could create a new app to check if you still have the problem.
Shweta Mathur 30,456 Reputation points Microsoft Employee Moderator

2022-09-05T06:57:16.947+00:00

Hi @SeekAzure

Just checking in to see if the below answer helped. If this answers your query, please don’t forget to click "Accept the answer" and Up-Vote for the same, which might be beneficial to other community members reading this thread. And, if you have any further query do let us know.

Thanks,
Shweta