How do I upsert a record in ADO.NET EF 4.1?

Question

I\'m trying to accomplish something really simple and I can\'t find how to do it using Entity Framework 4.1.

I want a controller method that accepts an object and

Answer 1

Unfortunately there is no way to do this without querying database or using stored procedure. The minimalistic code should be:

public void AddOrModify(T entity, string key) where T : class, IEntity // Implements MyKey 
{
     using (var context = new MyContainer())
     {
         if (context.Set().Any(e => e.MyKey == key))
         {
              context.Entry(entity).State = EntityState.Modified;
         } 
         else
         {
              context.Entry(entity).State = EntityState.Added;
         }

         context.SaveChanges();
     }
}