Question

I have these classes

public class CoffeeUser
{
    public CoffeeUser()
    {
        DrinkedCoffees = new Collection<DrinkedCoffee>();
    }

    public long CoffeeUserID { get; set; }

    public Guid Code { get; set; }

    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string EMail { get; set; }

    public virtual ICollection<DrinkedCoffee> DrinkedCoffees { get; set; }
}

public class DrinkedCoffee
{
    public long DrinkedCoffeeID { get; set; }

    public DateTime DateDrinked { get; set; }
}

How can i query for all items of DrinkedCoffees along with FirstName and LastName?
Result should look like this:

Tyler John 27.3.2012
Tyler John 28.3.2012
Tyler John 29.3.2012

I have tryed several queries but i was unsuccessful so far.

this was closest i was able to achieve:

    var list_4 = ctx.CoffeeUsers.Where(u => u.DrinkedCoffees.Count > 0).SelectMany(u => u.DrinkedCoffees).ToList();

Well, it took me 45 seconds to do this in sql. And 4 hours to not do it in entity 🙂

Answer 1

How about

  var DrinkedCoffies = ctx.CoffeeUsers.SelectMany(u => u.DrinkedCoffees, (u, cof) => new { FirstName = u.FirstName, LastName = u.LastName, DateDrinked = cof.DateDrinked } );