Silverlight Databinding – The Observable Collection

re: Silverlight Databinding – The Observable Collection

joelvarty — Thu, 05 Nov 2009 13:43:34 GMT

Just send the item that changed to the WCF service. Make a method that accepts the single Person object and persist that to the db.

re: Silverlight Databinding – The Observable Collection

John McIntosh — Thu, 05 Nov 2009 06:32:30 GMT

Suppose you return UserCollection to the Silverlight client using WCF and the client puts it in a DataGrid.ItemSource. Now someone modifies a name in one of the FirstName cells.

Now how do you get just that changed cell or row of that cell to go back to the middle tier? Or if you send the whole UserCollection back to the middle tier how can you tell what's changed in the collection?

In my case, I created an [OperationContract] method in my wcf service called

SaveChanges(ObservableCollection<Person> person)

and in my Silverlight client I call

svc.SaveChanges(datagrid.ItemSource)

When the WCF method receives the collection, I can see the modified name if I inspect each row however I have no idea how to programatically know that the name has been modified in any given row.

Can you please explain that?

re: Silverlight Databinding – The Observable Collection

joelvarty — Tue, 10 Feb 2009 14:00:39 GMT

Hey Tim - asp.net ajax 4 will be getting "live" bindings in the new client templating. Check it out: weblogs.asp.net/.../using-client-templates-part-2-live-bindings.aspx

re: Silverlight Databinding – The Observable Collection

Tim Mischkin — Tue, 10 Feb 2009 06:58:55 GMT

Hi Mr Varty,

great articel. I love it to use observable collection but is there a way to use it in asp.net as well?

It seems to me that this collection is only avaiable in WPF and Silverlight? Is there a similar collection for asp.net which works on the same way?

thx in advance

regards

Tim Mischkin