Question

I am using Entity Framework 5 with the a DbContext.

In my scenario I am trying to update an existing entity and persist the changes to the database. Amongst other properties, the entity has a ‘LastUpdated’ property which is a DateTime.

My entities are POCO entities and my context inherits from DbContext.

Here is my code:

public void Update(Location location)
{
    using (var context = new EfContext())
    {
        context.Locations.Attach(location);
        context.Entry(location).State = EntityState.Modified;
        context.SaveChanges();
    }
}

The requirements of my application require me to attach the modified entity to a new context rather than retrieve the entity from the same context first.

This actually does work for all fields on the entity, except the LastUpdated field. It is a datetime and is not saving.

Is there something I am doing wrong here?

Answer 1

Try to pass the location LastUpdated property value as parameter in Update method

public void Update(Location location, DateTime locationLastUpdated)
{
    using (var context = new EfContext())
    {
        location.LastUpdated = locationLastUpdated;
        context.Locations.Attach(location);
        context.Entry(location).State = EntityState.Modified;
        context.SaveChanges();
    }
}