private void SetEntityState(EntityState oldState, EntityState newState)
{
// The entity state can be Modified even if some properties are not modified so always
// set all properties to modified if the entity state is explicitly set to Modified.
if (newState == EntityState.Modified)
{
_stateData.FlagAllProperties(EntityType.Properties.Count(), isFlagged: true);
foreach (var keyProperty in EntityType.Properties.Where(
p => p.IsReadOnly ||
p.IsStoreComputed))
{
_stateData.FlagProperty(keyProperty.Index, isFlagged: false);
}
}
if (oldState == newState)
{
return;
}
// An Added entity does not yet exist in the database. If it is then marked as deleted there is
// nothing to delete because it was not yet inserted, so just make sure it doesn't get inserted.
if (oldState == EntityState.Added &&
newState == EntityState.Deleted)
{
newState = EntityState.Unknown;
}
if (newState == EntityState.Unchanged)
{
_stateData.FlagAllProperties(EntityType.Properties.Count(), isFlagged: false);
}
StateManager.Notify.StateChanging(this, newState);
_stateData.EntityState = newState;
if (oldState == EntityState.Unknown)
{
StateManager.StartTracking(this);
}
else if (newState == EntityState.Unknown)
{
if (oldState == EntityState.Added)
{
foreach (var property in EntityType.Properties.Where(p => _stateData.IsPropertyFlagged(p.Index)))
{
this[property] = property.PropertyType.GetDefaultValue();
}
}
// TODO: Does changing to Unknown really mean stop tracking?
// Issue #323
StateManager.StopTracking(this);
}
StateManager.Notify.StateChanged(this, oldState);
}
