SelectionMode=Multiple, SelectedItem and MVVM

[Roy Halvorsen]

I have a RadGrid where the user is supposed to select more than one item (multiple). In the ViewModel I have a property called _SelectedItem with NotifyPropertyChanged. First time i click a row in the grid, I get into the _SelectedItem property setter, but if I also want to select another row, the setter of _SelectedItem property is not fired. Am I missing something? CodeBehind is not allowed in the project where this is to be used.

This is my Grid:

<telerik:RadGridView Grid.Column="0" Grid.Row="1" Grid.ColumnSpan="4"
                      ItemsSource="{Binding ModelCollection}"
                      ActionOnLostFocus="None"
                      AutoGenerateColumns="False"
                      CanUserSortColumns="True"
                      IsFilteringAllowed="True"
                      SelectionMode="Multiple"
                      ShowGroupPanel="True"
                      RowIndicatorVisibility="Collapsed"
                      Height="470"
                      CanUserSelect="True"
                      SelectedItem="{Binding SelectedModel, Mode=TwoWay}"
                      IsSynchronizedWithCurrentItem="False"
                      IsReadOnly="True">
     <telerik:RadGridView.Columns>
         <telerik:GridViewDataColumn Header="Kode" Width="100" DataMemberBinding="{Binding Code}" />
         <telerik:GridViewDataColumn Header="Tekst" Width="360" DataMemberBinding="{Binding Text}" />
     </telerik:RadGridView.Columns>
 </telerik:RadGridView>

[Roy Halvorsen]

After some testing, I changed the SelectionMode to "Extended", and it works now and then if I use the ctrl+click or shift+click. If I select 4 items, the count is sometimes 4, sometimes 2, sometimes 3... Is this a bug in version 2010.2.812.40? And how can I achieve my goal without keyboard interaction?

[Milan]

Hi Roy Halvorsen,

If you would like to select multiple items without keyboard interaction you should set SelectionMode to Multiple. 

I am curious to understand which is the count that you are referring to? Is that the count of the SelectedItems property?

Regards,
Milan
the Telerik team

[Roy Halvorsen]

Yes it is. Most of the times when I loop through the selected items, it does not show all of my selected items. I have solved my selection issue by writing a behavior and SelectionMode set to Multiple, and it works the way I want it to, but that does not solve the Extended issue.

[Milan]

Hello Roy Halvorsen,

That is very strange. We would really appreciate it if you could send us a sample project that demonstrates this issue.

Greetings,
Milan
the Telerik team

[Richa]

I also need such type of functionality, Please answer.

[Rossen Hristov]

Hi Richa,

Since we cannot reproduce the behavior described in this thread, we would really appreciate it if you could send us a sample project that demonstrates this issue.

Thanks in advance.

All the best,
Ross
the Telerik team

[Vinod]

please tell me how can we retrieve muliple selected rows in our View Model...How can we do this?? any running project??

[Vlad]

Hi,

 I suggest you to check this blog post for more info. 

Greetings,
Vlad
the Telerik team