RadGridView CollectionChanged Event

[Nirav]

Hi,

Our code is using WPF with MVVM pattern. We are using the RadGridView to display the users data in rows with check box option to select/deselect all rows.

In my code I have a class which derives from 

Behavior<RadGridView>

and inside I have 

target.AssociatedObject.SelectedItems.CollectionChanged += target.GridSelectedItems_CollectionChanged;

where target is ​Behavior<RadGridView>

My WPF code related to grid is: 

<telerik:RadGridView x:Name="Users" HorizontalAlignment="Stretch" AutoGenerateColumns="False" ShowColumnFooters="True"  SelectionMode="Extended"><telerik:RadGridView x:Name="Users"Stretch" AutoGenerateColumns="False" ShowColumnFooters="True" SelectionMode="Extended">​

Issue:

When I select all using the top most checkbox in the grid - the event 

GridSelectedItems_CollectionChanged

fires for every item getting selected. So, if grid have 5 users in the grid - the event fires 5 times for selection/deselection of contacts.

 I think collection changed method should fire only one time.

 

Any clarification on this would be appreciated.

Thanks,

Nirav Patel

[Stefan]

Hi Nirav,

The recommended approach for such scenarios is to use the SelectionChanged event of RadGridView. Would it be possible for you to share some details on what you are trying to achieve? Is there a specific requirement to handle the CollectionChanged event of the SelectedItems collection, instead of SelectionChanged?

Best Regards,
Stefan
Telerik

[Nirav]

Thanks Stefan for the reply. My apologies for the late reply.

 I am using the code mentioned in the blog http://www.telerik.com/blogs/how-to-synchronize-your-ui-selected-items-with-your-data-context-using-mvvm-and-blend-behaviors-for-silverlight-and-wpf

It has the SelectedItems.CollectionChanged in it.

[Stefan]

Hello Nirav,

Thank you for this clarification.

However, for a scenario as yours in which you depend on the selection, as suggested in my previous post, I recommend you using the SelectionChanged event of the control.

Regards,
Stefan X1
Telerik

[Nirav]

Thanks Stefan for the update. I'll implement as suggested.