DataForm visual refresh problem

[Sami]

HI I have a DataForm where itemSource is a CollectionView source created with this 3 alternatives:

  c = CollectionViewSource.GetDefaultView(db.Clientes.Local.ToObservableCollection());
  c = CollectionViewSource.GetDefaultView(db.Clientes.ToList<Cliente>());
 c = CollectionViewSource.GetDefaultView(db.Clientes.Local.ToList<Cliente>());

 

db is a Context with entityFramework 6. When I edit dataForm the changes the poco doenst appear in the dataform but they are saved in to database.

  dataForm.BeginEdit();

   Cliente cliente =(Cliente) dataForm.CurrentItem ;
   cliente.Nombre = cliente.Nombre+"-";

 

 

Could you give me an advise to solve it?

[Sami]

Thanks for your help. It's working now. It is a good practice to use INotifyPropertyChanged with EtityFrame work?

[Martin Ivanov]

Hi Sami,

In order for the UI to reflect the updates of the data model (Client in your case), the updated property should raise the PropertyChanged event. In other words, the underlying object should implement the INotifyPropertyChanged interface.

Regards,
Martin Ivanov
Progress Telerik

[Sami]

 

Thanks for your help. It's working now. It is a good practice to use INotifyPropertyChanged with EtityFrame work?

[Martin Ivanov]

The recommended approach is to use MVVM wrappers classes over the EntityFramework entity models. For example, if you have an EF class named Person, you can create a (lets call name it) PersonWrapper class that can copy the information from Person and can be used in the WPF's UI. This requires some additional code to sync the EF models with the view model, but this approach is more reliable because you will avoid modifying the EF models with information that is not needed by EF. Also, you will have more freedom when it comes to application-based modifications in the models. 

You can check the following discussions on the topic:

* https://stackoverflow.com/questions/14132349/implement-inotifypropertychanged-on-generated-entity-framework-classes

* https://stackoverflow.com/questions/1261371/reducing-boilerplate-code-in-mvvm-wpf-app-for-attached-properties-commands-etc