Quick tips for Entity Framework Databinding

Quick tips for Entity Framework Databinding : EasyCoded

Quick tips for Entity Framework Databinding : EasyCoded — Thu, 09 Oct 2008 06:40:27 GMT

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re: Quick tips for Entity Framework Databinding

jbe — Mon, 02 Nov 2009 16:03:25 GMT

Thanks for this interesting post. I have some problems with data binding and WPF. I bind two DataGrids (WPF Toolkit) to the same EntityCollection but changes in one DataGrid aren’t updated in the other one (e.g. add new item).

I believe WPF doesn’t use the IListSource.GetList() method. Anyway, it would be nice to see the EntityCollection implementing the INotifyCollectionChanged interface in EF 4.0.

re: Quick tips for Entity Framework Databinding

divega — Mon, 02 Nov 2009 17:11:50 GMT

Hello,

We don't have plans to implement INotifyCollectionChanged in 4.0. But this is a good suggestion. Now that the interface has been moved to System.dll we can implement it without having to add a dependency on WindowsBase.dll. In the meanwhile, you can consider using your own ObservableCollections as binding lists for EF.

Take a look at Beth Massi's implementation here:

http://blogs.msdn.com/bethmassi/archive/2009/05/08/using-the-wpf-observablecollection-with-ef-entities.aspx

Or at C# version here:

http://blogs.msdn.com/diego/archive/2009/07/26/wpf-databinding-with-the-poco-template.aspx

The only detail that those samples are lacking is that they are not synchronizing the binding list with the source when changes happen in the source. You can listen to the AssociationChanged event on the EntityCollection for that.

Hope this helps,

Diego

re: Quick tips for Entity Framework Databinding

jbe — Wed, 04 Nov 2009 12:45:31 GMT

Hello Diego,

We use a similar approach as Beth Massi. However, for RAD (Rapid Application Development) it would be nice to bind directly to the EntityCollections generated by the EDM.

I hope to see this in a future release of EF.

Thanks,

jbe