Identity Return from savechanges but from object type.

Question

Hi, 
I have written my code as follows
public int createPerson(PERSON ObjPersonProfile)
            int i = 0;
            if (ObjPersonProfile != null)
                i = dataAdaptor.save(ObjPersonProfile);
            return i;
 public int save(object oObject)
            try
                SQLAdaptor ida = new SQLAdaptor();
                EntityConnectionStringBuilder ecb = ida.efConnstr();
                ef6Entities pef6Entities = new ef6Entities(ecb.ConnectionString);
                 pef6Entities.AddObject(oObject.GetType().Name + "s", oObject);
                 pef6Entities.SaveChanges();
            catch (Exception ex)
            return 1;
This is a common save method (http://geekswithblogs.net/danemorgridge/archive/2009/12/02/entity-framework-tip-building-a-reusable-save-method.aspx) which can be used for all entities. But now i need to return the latest id. This can be achieved in normal
scenario by <entity>.id. But i am not able to do so beacuse of the object type. Can some one tell me how i can return the new created value?
Thanks
Prachin Soparkar

Answer 1

Hello Prachin Soparkar,
>>But i am not able to do so beacuse of the object type. Can some one tell me how i can return the new created value?
You could try to use refection since the object type would be obtained at run time, and from the edmx medadata workspace, to obtain these primary key properties, and compare the object type property to check if current property is a PK, if so, set it value
and return it, here I made a demo, you could have a try:
class Program
static void Main(string[] args)
Order order = new Order() { OrderID = 3, OrderName = "3" };
var lastID = Save(order);
private static int Save(object order)
var lastID = 0;
using (DFDBEntities db = new DFDBEntities())
ObjectContext context = ((IObjectContextAdapter)db).ObjectContext;
context.AddObject(order.GetType().Name, order);
context.SaveChanges();
ReadOnlyMetadataCollection<EdmMember> PKs = (ReadOnlyMetadataCollection<EdmMember>)context.MetadataWorkspace.GetItems(DataSpace.CSpace).FirstOrDefault(i => i.BuiltInTypeKind.ToString() == "EntityType" && i.MetadataProperties["Name"].Value.ToString() == order.GetType().Name).MetadataProperties["KeyMembers"].Value;
var properties = order.GetType().GetProperties();
foreach (var property in properties)
if (PKs.Select(s => s.Name).Contains(property.Name))
lastID = (int)property.GetValue(order);
return lastID;
Regards.
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