SelectedItems and MVVM

[Ludwig]

Hi,

small question: how can I databind SelectedItems of a gridview to a collection of my viewmodel? I have a gridview with SelectionMode set to Extended:

<telerik:RadGridView Name="patientsGridView" SelectionMode="Extended" ItemsSource="{Binding Patients}" SelectedItem="{Binding SelectedPatient}" AutoGenerateColumns="False" IsReadOnly="True" >

 

and the viewmodel would contain:

public ObservableCollection<PatientViewModel> SelectedPatients { ... }

But how can I bind the grid's SelectedItems to the viewmodel's SelectedPatients?

Thanks,
Kind regards,
L

[Vlad]

Hi,

 You can check this blog post for more info. 

Greetings,
Vlad
the Telerik team

[Ludwig]

I tried it, but how can I get notified when the selection changes (without using code behind)?

[Ted]

The correct link to the blog post:
How To: Synchronize your UI selected items with your data context using MVVM and Blend behaviors for Silverlight and WPF

[Brennan]

I'm curiou as to why people keep posting this blog as an answer.  It doesn't work at all.

[Dilyan Traykov]

Hello Brennan,

For brevity, only part of the full code has been included in the blog post. A working version, however, has been provided at the bottom of the post. For your convenience, I'm attaching it here as well.

You can also find a similar example in the SDK Samples Browser with the title Binding SelectedItems From ViewModel.

 

I hope you find this helpful. Do let me know if you have any other questions or concerns.

Regards,
Dilyan Traykov
Telerik by Progress

[Brennan]

Hi Dilyan,

I was actually using the full code example on the blog post and still could not get it to work.  The github SDK example, however, I was able to get working, once I realized the view model SelectedItems property does not have a setter. I was trying to two-way bind the setter, and was expecting my viewmodel to be updated right as the selection in the grid changed, which obviously would not work in this case.  Once I explicitly called the getter on my viewmodel selecteditems collection, I got the expected result.

Thanks,

[Pradeep]

Hi Brennan,

What do you mean by "Once I explicitly called the getter on my viewmodel selecteditems collection, I got the expected result." Please explain.

 I am trying the two way binding of SelectedItems collection of my viewmodel. Thanks.