public async void LoadState(IDataContext state)
{
TrackingCollection trackingCollection = state.GetData(StateConstant);
if (trackingCollection == null)
{
return;
}
IList <IEntityStateEntry> changes = trackingCollection.GetChanges();
await _initializedTask;
_trackingCollection.UpdateStates(changes);
foreach (IEntityStateEntry change in changes)
{
var oldOrder = change.Entity as OrderModel;
if (oldOrder == null)
{
_trackingCollection.UpdateState(change);
}
else
{
OrderModel currentOrder = GridViewModel.OriginalItemsSource.FirstOrDefault(model => model.Id == oldOrder.Id);
switch (change.State)
{
case EntityState.Added:
GridViewModel.OriginalItemsSource.Add(oldOrder);
break;
case EntityState.Modified:
if (currentOrder != null)
{
GridViewModel.OriginalItemsSource.Remove(currentOrder);
}
GridViewModel.OriginalItemsSource.Add(oldOrder);
break;
case EntityState.Deleted:
if (currentOrder != null)
{
GridViewModel.OriginalItemsSource.Remove(currentOrder);
}
break;
}
}
}
this.OnPropertyChanged(() => v => v.HasChanges);
}