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 giv

Answer 1

I have seen this exception when running under IIS 7 on Windows 7.

System.Security.Principal.WindowsIdentity.GetCurrent().Name returns "IIS APPPOOL\ASP.NET v4.0".

This is not a real user account, which partly explains what is happening, though IMHO UserPrincipal.Current should handle this situation more gracefully.

I think it's a bug and have created a bug on Connect:

http://connect.microsoft.com/VisualStudio/feedback/details/748790/userprincipal-current-throws-invalidcastexception

As a workaround, use System.Security.Principal.WindowsIdentity.GetCurrent() to get the identity of an IIS AppPool.