c# - Unable to cast object of type in System.DirectoryServices.AccountManagement.GroupPrincipal

Question

I am Using Method UserPrincipal.Current.ToString() in Domain to Get Current Logged in Domain User with Valid Domain. but when i am Displaying it in a string its giving Error when hosted in IIS Server:

Unable to cast object of type 'System.DirectoryServices.AccountManagement.GroupPrincipal'
           to type 'System.DirectoryServices.AccountManagement.UserPrincipal'.

Answer 1

I had the same problem. It worked perfectly on my local machine but when deployed it to IIS on the server it failed. In the end I had to change two things to make it work:

1. Change the Authentication to "Windows Authentication" (how-to)

2. Instead of using current, doing it in two steps: (source)

PrincipalContext ctx = new PrincipalContext(ContextType.Domain);

UserPrincipal user = UserPrincipal.FindByIdentity(ctx, User.Identity.Name);

And to finally get the name (or any other info), I used user.DisplayName.