c# - Inject current user to OWIN Self-Host Web API 's service -

i using services business logic in owin self-host web api, , want inject current user services.

this identityservice currentuser property:

public class identityservice : iidentityservice {     private readonly usermanager<user, int> usermanager;      public identityservice(usermanager<user, int> usermanager)     {         if (usermanager == null)         {             throw new argumentnullexception("usermanager");         }          this.usermanager = usermanager;     }      public user currentuser     {                 {             var identity = thread.currentprincipal;              if (identity == null || identity.identity == null || !identity.identity.isauthenticated)             {                 if (httpcontext.current == null || httpcontext.current.user == null)                 {                     return null;                 }                  identity = httpcontext.current.user;             }              var user = this.usermanager.findbyname(identity.identity.name);             return user;         }     } } 

for self-hosted web api httpcontext.current null, should check it? perhaps better way determine current user?