Entity Framework 5.0 增删改查（级联）

Entity Framework 5.0 增删改查（级联）

[TestClass]
    public class UnitTest1
    {
        [TestMethod]
        public void TestInsert()
        {
            using (TestEntities1 context = new TestEntities1())
            {
                User user = new User();
                user.ID = 10;
                user.UName = "Jim";

                user.Address = new Address();
                user.Address.ID = 7;
                user.Address.Address1 = "附件";
               
                context.Set<User>().Add(user);


                DbEntityEntry<Address> entry = context.Entry<Address>(user.Address);
                entry.State = System.Data.EntityState.Modified;
                //entry.State = System.Data.EntityState.Added;

                DbEntityEntry<User> entry2 = context.Entry<User>(user);
                entry2.State = System.Data.EntityState.Added;

                context.SaveChanges();
               
            }
        }

         [TestMethod]
        public void TestUpdate()
        {
            using (TestEntities1 context = new TestEntities1())
            {
                User user = new User();
                user.ID = 10;
                user.UName = "Jim";

                user.Address = new Address();
                user.Address.ID = 7;
                user.Address.Address1 = "福建";

                context.Set<User>().Add(user);


                DbEntityEntry<Address> entry = context.Entry<Address>(user.Address);
                entry.State = System.Data.EntityState.Modified;

                DbEntityEntry<User> entry2 = context.Entry<User>(user);
                entry2.State = System.Data.EntityState.Modified;

                context.SaveChanges();

            }
        }

         [TestMethod]
        public void TestSelect()
        {
            using (TestEntities1 context = new TestEntities1())
            {
                var user = context.UserAndSubs().Where(u => u.ID == 10)
                    .Select(u => u).ToList();
            }
        }

         [TestMethod]
        public void TestDelete()
        {
            using (TestEntities1 context = new TestEntities1())
            {
                var user = context.UserAndSubs().Where(u => u.ID == 10).First();

                context.Set<User>().Add(user);
                
                context.Set<Address>().Remove(user.Address);

                context.Entry<User>(user).State = System.Data.EntityState.Deleted;

                context.SaveChanges();
            }
        }
    }