Question

I have a table named as EnrollTrainee. I have these columns in my EnrollTrainee Model Class:

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

public int TraineeID { get; set; }      

public int TrainerID { ![enter image description here][1]get; set; }

public virtual CreateUsers user_userid { get; set; }

public virtual CreateUsers user_id { get; set; }

public DateTime dt { get; set; }

These two Columns TraineeID and TrainerID are to be mapped with User_id Column in table CreateUser.

Here is CreateUser Model Class

    public class CreateUsers
    {
    [Key]
      public int User_Userid { get; set; }

    [Required]
    [Display(Name="Enter User Name")]
    public string User_name { get; set; }

    [Required]
    [Remote("IsDomainIDExist", "Account", ErrorMessage = "Domain ID Already Exist")]
    [Display(Name = "Enter Domain ID")]
    public string User_username { get; set; }

    [Required]
    [DataType(DataType.Password)]
    [Display(Name = "Enter Password")]
    public string User_password { get; set; }

    [Required]
    [Display(Name = "Enter Department")]
    public string User_department { get; set; }

    [Required]
    [Remote("IsEmployeeIDExist", "Account", ErrorMessage = "Domain ID Already Exist")]
    [Display(Name = "Enter Employee ID")]
    public string User_employeeid { get; set; }

    [Required]
    [Display(Name="Select Role Type")]
    public int RoleID { get; set; }

    [Display(Name="Enable?")]
    public bool User_Enable { get; set; }

    [DataType(DataType.DateTime)]
    [Display(Name = "Date Time")]
    public DateTime dt { get; set; }

    public virtual RoleModel Role { get; set; }

 }

How can I map two Foreign Key with same Primary Key in EF CF?

Answer 1

Something like this:

public class EnrollTrainee
{
    [Key]
    public int id { get; set; }

    public int TraineeID { get; set; }

    public virtual CreateUser Trainee { get; set; }

    public int TrainerID { get; set; }

    public virtual CreateUser Trainer { get; set; }

    public DateTime dt { get; set; }
}

internal class EnrollTraineeConfiguration:EntityTypeConfiguration<EnrollTrainee>
{
    public EnrollTraineeConfiguration()
    {
        ToTable("EnrollTrainee");
        Property(c => c.dt).HasColumnName("dt");
        Property(c => c.TraineeID).HasColumnName("TraineeID");
        Property(c => c.TrainerID).HasColumnName("TrainerID");
        HasKey(c => c.id);
        HasRequired(c => c.Trainee).WithMany().HasForeignKey(c=>c.TraineeId);
        HasRequired(c => c.Trainer).WithMany().HasForeignKey(c => c.TrainerId);
    }
}
public class Context: DbContext
{
     protected override void OnModelCreating(DbModelBuilder modelBuilder)
     {
          modelBuilder.Configurations.Add(new EnrollTraineeConfiguration());
          ......
     }
     ....
}