c# - Authenticator. Class design -

have base class authenticatorbase has ability log in users different authentication subjects - login & password , token. class looks this:

public abstract class authenticatorbase {      public abstract loginresult login(object authsubject);      public abstract void logout(string sessionkey); } 

the sub-class authenticates login & password

public class basicauthenticator : authenticatorbase {     public override loginresult authenticate(object authsubject) {         logindata credentials = authsubject logindata;          if (dbcontext.security.authorize(credentials))           ...............    } } 

the sub-class authenticates token

public class tokenbasedauthenticator: authenticatorbase {      public override loginresult authenticate(object authsubject)      {         string token = authsubject string;          user user;         if (dbcontext.security.loginwithtoken(token, out user))             ...........     } } 

what don't in code parameter authsubject of type system.object, need cast in sub-classes. if use, basicauthenticator, might pass invalid type parameter. know can make generic type authenticatorbase , have 2 sub-classes basicauthenticator: authenticatorbase<logindata> , tokenbasedauthenticator : authenticatorbase<string>. if need have them in list, both generic classes don't have common interface. create additional interface this:

public interface iauthenticator {        loginresult login(object authsubject); }  public abstract class authenticatorbase<tauthsubject>: iauthenticator {     public abstract loginresult login(tauthsubject authsubject);     // implementing interface    loginresult iauthenticator.login(object authsubject)     {        return login((tauthsubject)authsubject);    } } 

now can store instances of iauthenticator in list, seems overwhelmed. what's best way rid of parameter authsubject type system.object??? want call , pass correct instance of type authenticators without having think correct types authenticator accepts.