how to convert Csla.ApplicationContext.User to SLMPrincipal class ?

[SachinPNikam]

Question
I have
public class SLMPrincipal : Csla.Security.CslaClaimsPrincipal --BO

I did login after I want get the Csla.ApplicationContext.User back to the SLMPrincipal

below code is not working getting error like can not convert claim principal to SLMPrincipal

(SLMPrincipal)Csla.ApplicationContext.User

Version and Platform
CSLA version: 5.1.0
Platform-.NetCore 3.0

[rockfordlhotka]

Microsoft has been aggressive in pushing us all to use ClaimsPrincipal and ClaimsIdentity. To the point that they'll often silently switch a custom principal type to a ClaimsPrincipal "for you".

As a result, I'm moving ProjectTracker and all other samples to use those two types and not to try and use any custom types. Custom types are just problematic.

Starting in version 5.1 the MobileFormatter includes functionality to serialize the (otherwise not serializable) claims types, providing you with a seamless experience.

[SachinPNikam]

Thanks Rocky for quick ,valuable reply .