Inserting multiple rows into a table using Entity Framework

Question

I’m having fun with EF and have come unstuck.

Originally I used the following bit of code using standard linq that essentially enters some data into a table.

Answer 1

I presume you have recreated your model in the Entity Framework designer? This should have created a class deriving from ObjectContext specific to your model. By convention, this ends in "Entities".

Have a look at your ManagePreferencesEntities instance - or whatever yours is called. It should have a property on it corresponding to the table for your entities, tblManagePreferences perhaps. This is the ObjectSet instance for that specific table, and it has an AddObject method that you can use to add entities into that table.

Try this instead of the last 5 or so lines of code:

manpref.tblUserPreferences.AddObject(prefMemberId);
manpref.tblUserPreferences.AddObject(prefLocationId);
manpref.SaveChanges();

By default ObjectSet doesn't support adding lists of things, but it's easy to create your own extension method:

public static class ObjectSetExtensions
{
     public static void AddObjects(this ObjectSet objectSet, IEnumerable objects)
     {
         foreach (var item in objects)
         {
            objectSet.AddObject(item);
         }
     }
}