Question

Since there is no DeleteAllOnSubmit() method for LINQ to Entities. So I myself create it and named for DeleteAllObjects as following code.

public static void DeleleAllObjects<TEntity>(this ObjectSet<TEntity> objectSet, TEntity[] objects)
{
    foreach(var o in objects)
    {
        objectSet.DeleteObject(o);
    }
}

However the code I write fail on compile and get the error message:

The type ‘TEntity’ must be a reference type in order to use it as
parameter ‘TEntity’ in the generic type or method

I think use foreach with DeleteObject all the time is not a good idea for delete collection.

Answer 1

Try this. The method needs to be a generic, TEntity is simply the placeholder for the type.

public static void DeleteAllObjects<TEntity>( this ObjectSet<TEntity> objectSet,
                                              IEnumerable<TEntity> objects)
    where TEntity : class
{

   foreach(var o in objects)
   {
      objectSet.DeleteObject(o);
   }
}