Question

I got this code that I use for User Create.

    public static void CreateUser(User user)
    {

            Save<User>(u => u.AddObject(user));

     }

    Save<T>(Action<ObjectSet<T>> func)
       where T : class
    {

        ...

        func(entitySet);

        entitiesContext.SaveChanges();
    }

Now I am trying to write an update method, but it doesn’t compile on u = user

public static void UpdateUser(User user)
{
        Save<User>(u => u = user);
}       

How do I update an object?

Answer 1

If the entity is detached from context you can update it as follows.

public static void UpdateUser(User user)
{
      Save<User>(u => { 
         u.Attach(user); 
         u.Context.ObjectStateManager
              .ChangeObjectState(user, System.Data.EntityState.Modified);
         });
}