How to load the navigation property with EF Core?

Question

In EF6 we had such option:

context.Set().Attach(entity);
context.Entry(entity).Collection(\"NavigationProperty\").Load();

Si

Answer 1

See below Code,
I'm inserting data in UserRef table as well another table which we have many 2 many relationships.

public void AddUser(User user, IEnumerable securityQuestion, string password)
    {
        var userModel = _mapper.Map(user);
        userModel.CreateTime = DateTime.Now;

        userModel.UserNewsLetterMaps.ToList().ForEach(u => this._context.UserNewsLetterMaps.Add(u));            
        this._context.RoleRefs.Attach(new RoleRef() { RoleId = (int)user.UserRole, UserRefs = new List { userModel } });
        userModel.ResidenceStatusRefs.ToList().ForEach(u => this._context.ResidenceStatusRefs.Attach(u));
        this._context.UserRefs.Add(userModel);
        this.Save();
    }