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Applying row style according to row hierarchy level
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This is a migrated thread and some comments may be shown as answers.
Andrew
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Andrew asked on 29 Oct 2010, 05:05 PM
I'm trying to apply row styles to my RadTreeListView depending on the hierarchy level of the row. Basically, I want all top level rows to be have a bold font weight, but all other rows to be normal. Below is the StyleSelector I am using:

public class RowStyleSelector : StyleSelector
{
    public Style TopLevelRowStyle { getset; }
    public Style DetailRowStyle { getset; }

    public override Style SelectStyle(object item, DependencyObject container)
    {
        if (container.GetType() == typeof(TreeListViewRow))
        {
            TreeListViewRow row = (TreeListViewRow)container;

            if (row.Level == 0)
                return TopLevelRowStyle;
            else
                return DetailRowStyle;
        }      
         return DetailRowStyle;
    }
}

However, I get a NullReferenceException when trying to access the Level property of the TreeListViewRow. This is the stack trace:

{System.NullReferenceException: Object reference not set to an instance of an object.
   at Telerik.Windows.Controls.TreeListView.TreeListViewRow.get_Level()
   at SEDashboard.Controls.RowStyleSelector.SelectStyle(Object item, DependencyObject container)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.ApplyRowStyle(GridViewRow row)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.PrepareContainerForItemOverride(DependencyObject element, Object item)
   at Telerik.Windows.Controls.RadTreeListView.PrepareContainerForItemOverride(DependencyObject element, Object item)
   at Telerik.Windows.Controls.GridView.BaseItemsControl.Telerik.Windows.Controls.GridView.IGeneratorHost.PrepareItemContainer(DependencyObject container, Object item)
   at Telerik.Windows.Controls.GridView.GridViewItemContainerGenerator.System.Windows.Controls.Primitives.IItemContainerGenerator.PrepareItemContainer(DependencyObject container)
   at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.InsertContainer(Int32 childIndex, UIElement container, Boolean isRecycled)
   at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.InsertNewContainer(Int32 childIndex, UIElement container)
   at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.AddContainerFromGenerator(Int32 childIndex, UIElement child, Boolean newlyRealized)
   at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.MeasureOverride(Size constraint)
   at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)}


What am I doing wrong?

Thanks,

Andrew

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Veselin Vasilev
Telerik team
answered on 04 Nov 2010, 01:02 PM
Hello Andrew,

This is probably a bug and I have logged it in our public issue tracking system. You can check its status here.

As a workaround, you can create a Level property of your business object and select the style based on its value. The first parameter of the SelectStyle method is your business object.

I have updated your Telerik points.

Best wishes,
Veselin Vasilev
the Telerik team
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Veselin Vasilev
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