Multiple Primary Key with asp .net mvc 3

Question

I\'m using asp .net mvc 3, and I have a problem with an entity that contains 2 primary key, when I try to insert data in the table.

 public class LineItem
           


        

Answer 1

Assuming this is actually a composite key, since you can't have 2 primary keys... The error message tells you exactly what to do, namely add an order. You can do this by adding [Column(Order = 0)] and [Column(Order = 1)] to your key columns.

For your example:

public class LineItem
    {
        [Key][Column(Order = 0)]
        public int OrderId { get; set;}
        [Key][Column(Order = 1)]
        public int LineNum  { get; set;}
        public string ItemId { get; set;}
        public int Quantity { get; set;}
        public decimal UnitPrice { get; set; }

    }