MULTIPLE SELECTIONS IN RADLISTBOX USING MVVM

[Shruti]

Hi,
I have a query.I am developing WPF app and using MVVM Architecture.
 I have a RadListbox which gives the option of selecting multiple items.I want to access the selected items in my Viewmodel. How do i do it??

Thanks in advance

Shruti

[Yana]

Hi Shruti,

I would suggest that you check the following blog post which explains how to achieve the needed approach:
http://blogs.telerik.com/xamlteam/posts/13-01-14/extending-the-functionality-of-radcontrols-with-attached-properties

Regards,
Yana
Telerik

[David]

Unfortunately the code in the blog post is a bit buggy.
The first selection is off.

Also, it's not generic.

[Yana]

Hi David,

The issue with the initial selection is already logged in our Feedback Portal, you can track its progress at the following link:
http://feedback.telerik.com/Project/143/Feedback/Details/118799-using-an-attached-property-to-populate-the-selecteditems-of-the-control-initially

As a workaround you could simply set the SelectedItems in the Loaded event of the control rather than in the ViewModel:

private void ListBox_Loaded(object sender, RoutedEventArgs e)
{
     var items = this.ListBox.ItemsSource as ObservableCollection<Country>;
     this.MyViewModel.SelectedCountries = new System.Collections.ObjectModel.ObservableCollection<Country>()
     {
    items[4],
    items[5],
    items[6],
    items[7]
     };
}

I hope this helps.

Regards,
Yana
Telerik