首先使用实体​​代码的3个表之间的一对多关系

Question

Lets say I have 3 tables such as cities, tours and tourdetails

I want to store data about cities which are included in tour and duration of visit for each city. each tour might have several cities.

here is my code

public class TourDetails 
{
    [Required, Key]
    public int ID { get; set; }
    [Required]
    public int Duration { get; set; }

    [Required]
    public virtual City City { get; set; }
    [Required]
    public virtual Tour TourID { get; set; }
}

public class Tour
{
    [Required, Key, MaxLength(5), MinLength(5)]
    public string ID { get; set; }
    [Required, MaxLength(20)]
    public string TourName { get; set; }
    [Required]
    public int TotalDuration { get; set; }
    [Required]
    public decimal Price { get; set; }

    [Required]
    public virtual ICollection<TourDetails> TourDetails { get; set; }
}

public class City
{
    [Required, Key]
    public int ID { get; set; }
    [Required, MaxLength(20)]
    public string CityName { get; set; }

    [Required]
    public virtual ICollection<TourDetails> TourDetails { get; set; }
}

My problem is that when I compile code Entity Framework doesn't shows me TourDetails table in diagram at all (table are being added to base) I'm pretty new to Entity Framewrok and just trying to learn so it might be a silly question but I hope I will get a proper answer.

---

Issue is solved, problem was with my sql manager studio not with code, thanks a lot who tried to help and sorry for your time :)

Answer 1

You are lacking ids of the entities (and one of properties' name is wrong):

public int CityId { get; set;}
public virtual City City { get; set; }
public int TourId { get; set; }
public virtual Tour Tour { get; set; }

Entity Framework should now detect the relationship