Check user Login using Repository pattern c#

Question

I'm new at design patterns and I'm trying to make some example using repository pattern (Maybe I'll ask some stupid question using stupid example and if it's so please tell me).

I have this repository in my BusinessLogicLayer:

public interface IUserRepository
{
    LogIn GetByUsernameAndPassword(LogIn user);
}

and in my data access layer

class UserRepository : IUserRepository
{
    ChatAppDBContext _db = new ChatAppDBContext();
    public LogIn GetByUsernameAndPassword(LogIn login)
    {
        return _db.Users.Where(u => u.Email == login.Email & u.Password == login.UserPassword).FirstOrDefault();
    }
}

but it throws an error that Error:

Cannot implicitly convert type 'DataAccessLayer.User' to 'BusinessLogicLayer.Model.LogIn'

How can I solve that?

Answer 1

class UserRepository : IUserRepository
{
    ChatAppDBContext _db = new ChatAppDBContext();
    public Login GetByUsernameAndPassword(LogIn login)
    {
         var userResult = _db.Users.FirstOrDefault(u => u.Email == login.Email & u.Password == login.UserPassword);

         if (userResult == null)
             // throw new Exception() or return new Login();

         Login loginResult = new Login();
         loginResult.Email = userResult.Email;
         return loginResult;                    
    }
}