RadGridView, ObservableCollection and currentitem

[Knut]

Hi
I'm trying to replace my wpf listview with radgridview, but the selecteditem binding to the observablecollection does not work.

<ListView Name="lboRoles" Grid.Row="1" Grid.Column="0" ItemsSource="{Binding}" Grid.ColumnSpan="1" IsSynchronizedWithCurrentItem="True"  SelectionMode="Single" >
     <ListView.View>
         <GridView>
             <GridViewColumn Header="Name" Width="200"  DisplayMemberBinding="{Binding Path=Name}"/>
             <GridViewColumn Header="Description" Width="200"  DisplayMemberBinding="{Binding Path=Description}"/>
         </GridView>
     </ListView.View>
 </ListView>
 <mytelerik:RadGridView x:Name="gvRoles" ItemsSource="{Binding}" SelectionMode="Single" IsReadOnly="True"
                        Grid.Column="0" Grid.Row="0" IsSynchronizedWithCurrentItem="True" AutoGenerateColumns="False"
                        ShowGroupPanel="False" CanUserFreezeColumns="False" ShowColumnFooters="False">
     <mytelerik:RadGridView.Columns>
         <mytelerik:GridViewDataColumn Header="Name" DataMemberBinding="{Binding Name}">
         </mytelerik:GridViewDataColumn>
         <mytelerik:GridViewDataColumn Header="Description" DataMemberBinding="{Binding Description}">
         </mytelerik:GridViewDataColumn>
     </mytelerik:RadGridView.Columns>
 </mytelerik:RadGridView>

When selecting a row in the listview, the observablecollection currentrow is changed, but not when selecting a row in the radgridview.
Is there a different way to do this with radgridview? Do I need a binding to selecteditem?

Knut

[Milan]

Hi Knut,

I am not sure if I understand the question correctly. Where is the current item defined? The ObservableCollection class does not expose current item property. Could you please elaborate on the issue.

Greetings,
Milan
the Telerik team

[Marius]

This does not work because the RadGridView does not "respect the rules of binding". When you bind a collection to an ItemsSource, the target control should use the default CollectionView obtained through the CollectionViewSource.GetDefaultView(..), this way you get currency management for free. The ListView does the aforementioned, but the RadGridView does not. You can workaround this issue by doing one of the following:

1) Create a CollectionViewSource in the resource-section and bind it to the collection which you intend to bind to the grid, then bind your RadGridView to the CollectionViewSource. This however has the side-effect that you lose some IDataErrorInfo support since your binding to a ICollectionView instead of the actual collection.

2) Manually listen  to SelectedItemChanged on your grid and the default view CurrentItemChanged, sync them in code-behind. (use CollectionView.MoveCurrentItemTo() and similar on the grid.

I really hope this will be fixed soon because it was reported over a year ago.

[StackOverflowed]

I agree. I see strange grid behavior where the current cell and selected cell/row go out of sync constantly. It's become extremely annoying for our users and the latest releases don't fix it.

Is there a way to keep the current cell and selected cells in sync?

[Milan]

Hi StackOverflowed,

The selected cell/row is not kept in sync with current cell by design. If you would like to sync selected cell/row with the current cell you could use the following workaround.

 

public MainWindow()
{
    InitializeComponent();

    this.clubsGrid.CurrentCellChanged+=new System.EventHandler<GridViewCurrentCellChangedEventArgs>(clubsGrid_CurrentCellChanged);
}

private void clubsGrid_CurrentCellChanged(object sender, GridViewCurrentCellChangedEventArgs e)
{
    e.NewCell.ParentRow.IsSelected = true;
}

Regards,
Milan
the Telerik team