Entity Framework - Selective Condition on Included Navigation Property

Question

Assume I have these simplified EF generated entities...

public class PurchaseOrder
{
     public int POID {get;set;}
     public int OrderID         


        

Answer 1

You can't selectively pull back certain child entities that match a certain condition. The best you can do is manually filter out the relevant orders yourself.

public class PurchaseOrder
{
     public int POID {get;set;}
     public int OrderID {get;set;}
     public int VendorID {get;set;}
     public IEnumerable Orders {get;set;}

     public IEnumerable MatchingOrders {
         get {
            return this.Orders.Where(o => o.VendorId == this.VendorId);
         }
     }
}