Entity framework 5.0 handle optimistic concurrency exception?

Question

When handling several potential exceptions during a context.SaveChanges() one of the exceptions is OptimisticConcurrency. Microsoft\'s documentatio

Answer 1

The way how to solve concurrency exception in DbContext API reloads original entity:

catch (DbUpdateConcurrencyException ex)
{
    // Get failed entry
    var entry = ex.Entries.Single(...);
    // Overwrite original values with values from database but don't
    // touch current values where changes are held
    entry.OriginalValues.SetValues(entry.GetDatabaseValues());
}

You should also be able to use the mentioned code but you must get ObjectContext instance from your DbContext instance (it is just a wrapper around ObjectContext).

catch (DbUpdateConcurrencyException ex)
{
    var objContext = ((IObjectContextAdapter)context).ObjectContext;
    // Get failed entry
    var entry = ex.Entries.Single(...);
    // Now call refresh on ObjectContext
    objContext.Refresh(RefreshMode.ClientWins, entry.Entity);        
}

You may even try:

objContext.Refresh(RefreshMode.ClientWins, ex.Entries.Select(e => e.Entity));