Entity Framework 5 - Why is Entity State “Modified” after PropertyValue is set back to Original

Question

i use the EF5 and don\'t know why a entity has the state \"modified\" after i set the only changed PropertyValue of this entity back to the original value.

Answer 1

Building on User1481065's answer, to overcome the possibility of an exception if any of OriginalValues is null, try the below. I've assumed a context that may contain more than one entity that may have updates (which may not necessarily be actual changes in value).

_dirty = False
Dim oChanges As IEnumerable(Of DbEntityEntry(Of CsSetting)) = _dbContext.ChangeTracker.Entries(Of CsSetting)().Where(Function(r) r.State <> EntityState.Unchanged)
For Each c As DbEntityEntry(Of CsSetting) In oChanges
    _dirty = c.OriginalValues.PropertyNames.Any(Function(n) (c.OriginalValues(n) Is Nothing And c.CurrentValues(n) IsNot Nothing) OrElse (c.OriginalValues(n) IsNot Nothing AndAlso Not c.OriginalValues(n).Equals(c.CurrentValues(n))))
    If _dirty Then Exit For
Next c
Return _dirty

You may not need the loop and therefore the presetting of _dirty.