c# - Entity Framework Code First Using One column as Primary Key and another as Auto Increment Column

Question

I have a class named Sale

public class Sale
{
    public int Id { get; set; }
    public string TrNo { get; set; }
    public DateTime Date { get; set; }
    public int CustomerID { get; set; }

    public ObservableCollection<SaleDetail> SaleDetails { get; set; }
}

And in the database, I want the Id as the Auto Increment column and the TrNo as the Primary Key column.

Please tell me how to do this using EF5 code first.

Thanks.

Answer 1

You can also do this with Data Annotations:

public class Sale
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }

    [Key]
    public string TrNo { get; set; }

    public DateTime Date { get; set; }
    public int CustomerID { get; set; }

    public ObservableCollection<SaleDetail> SaleDetails { get; set; }
}