There is no constructor in a class extracted from a common class

Question

I am trying to create a shared LINQ-TO-SQL repository based on this post , which basically allows you to define a common base class repository, then you can define all your actual repository classes based on a common base.

I want the option of using the repository with or without transfer in the data context, so I decided to create two constructors in the base base class:

  public abstract class GenericRepository<T, C>
        where T : class
        where C : System.Data.Linq.DataContext, new()
    {
        public C _db;

        public GenericRepository()
        {
            _db = new C();
        }


        public GenericRepository(C db)
        {
            _db = db;
        }


        public IQueryable<T> FindAll()

    ... and other repository functions
   }

To use it, I would intimidate my actual repository class:

public class TeamRepository : GenericRepository<Team, AppDataContext> { }

Now, if I try to use this with a parameter:

AppDataContext db = new AppDataContext();
TeamRepository repos=new TeamRepository(db);

I get an error:   "App.Models.TeamRepository" does not contain a constructor that takes 1 argument

, , #, , , : TeamRepository() TeamRepository (db)

Answer 1

, .

public class TeamRepository : GenericRepository<Team, AppDataContext>
{
    public TeamRepository() : base() { }
    public TeamRepository(AppDataContext db) : base(db) { }
}

, ( ) , , .

Answer 2

, # . . .