Class user roomid(FK) = class room ID(PK) one to one relationship in efcodefirst

Question

1.00/5 (2 votes)

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C#

public class User
    {
        public int ID { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Gender { get; set; }
        public string Telephone { get; set; }
        public string Mail { get; set; }
        public string TcNo { get; set; }

        public virtual Room RoomID { get; set; }
    }

public class UserMap : EntityTypeConfiguration<user>
    {
        public UserMap()
        {
            HasKey(x => x.ID);
            Property(x => x.ID)
                .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);

            HasRequired(x => x.RoomID)
                .WithOptional(l => l.UserRoom)
                .Map(x => x.MapKey("RoomID"));


        }
    }


-----------------Room--------------------------------
public class Room
    {
        public int ID { get; set; }
        public int? RoomNo { get; set; }
        public int NightFee { get; set; }
        public RoomType RoomType { get; set; }
        public RoomStatus RoomStatus { get; set; }
        public string Description { get; set; }
        public bool? Cleaning { get; set; }
        public bool? Available { get; set; }
        public DateTime CheckInDate { get; set; }
        public DateTime CheckOutDate { get; set; }


        public virtual User UserRoom { get; set; }
    }


public class RoomMap : EntityTypeConfiguration<room>
    {
        public RoomMap()
        {
            HasKey(x => x.ID);
            Property(x => x.ID)
                .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);

        }
    }

What I have tried:

C#

addroom.UserRoom.RoomID = adduser.RoomID;
adduser.RoomID.UserRoom = addroom.UserRoom;
adduser.RoomID = addroom.UserRoom.RoomID;

Posted 24-Apr-18 2:05am

İsa KAYA

Updated 25-Apr-18 1:38am

v10

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Gerry Schmitz · Answer 1 · 2018-04-24T07:57:00

Solution 1

The convention is: class name + "Id".

Then EF can make assumptions about an "identity" primary key.

Use:

[Key]
public int UserId {get;set;}

Posted 24-Apr-18 7:57am

Gerry Schmitz

Comments

İsa KAYA 24-Apr-18 15:31pm

Thanks But Unfortunately it is Not

Class User ID(KEY)
Class User RoomID(ForeignKey)=Class Room ID(KEY)

Example
I want to do;
table Room-------table User
--------------------ID=03
ID=05 ========RoomID=05(Table Room ID)

Dave Kreskowiak · Answer 2 · 2018-04-24T10:09:00

You've got this completely wrong. You don't need the Configuration class at all for such a simple relationship.

I'm assuming your Room class looks something like this:

C#

public class Room
{
    [Key]
    public int RoomId { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
}

Your User class should look like this:

C#

public class User
{
    [Key]
    public int UserId { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Gender { get; set; }
    public string Telephone { get; set; }
    public string Mail { get; set; }
    public string TcNo { get; set; }

    public virtual Room Room { get; set; }
}

Again, no configuration class is required. The Room will automatically be optional.
You also don't really need the Key attributes, because the Id name matches the class name appended with "Id". I just put them in there because I like to be more "documenting" in my code and less "convention".