Question

I use code first to test lazy loading, models as below,

class Team
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public string Boss { get; set; }
        public string City { get; set; }
        public List<Player> players { get; set; }

        public Team()
        {
            players = new List<Player>();
        }
    }

    class Player
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public int Number { get; set; }
        public int Age { get; set; }
        public Team team { get; set; }
    }

and context likes this,

class testContext : DbContext
    {
        public DbSet<Team> teamSet { get; set; }
        public DbSet<Player> playerSet { get; set; }
    }

I read Julia Lerman’s book “Programing Entity Framework”, and got confused with lazy loading. When I write the code as below,

using (var context = new testContext())
            {
                //context.Configuration.LazyLoadingEnabled = false;
                //var teams = from t in context.teamSet.Include(p=>p.players) select t;
                var teams = from t in context.teamSet select t;
                foreach (var v in teams)
                {
                    Console.WriteLine(v.players.Count());
                }
                Console.Read();
            }

When foreach statement is executed, I think v.players.Count() will hit the database and return me the value, and if I disabled lazy loading, it will not hit the database and return zero to me. But no matter I enabled lazy loading or disabled lazy loading, the value always zero. Is my understanding of lazy loading wrong? Anyone can help?

Answer 1

Try to make your Player’s virtuel

public Virtual List<Player> players { get; set; }