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Add null check for ListDetailsView.OnListPaneWidthChanged #4817

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Add null check for ListDetailsView.OnListPaneWidthChanged #4817

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3 changes: 2 additions & 1 deletion CommunityToolkit.WinUI.SampleApp/SamplePages/ListDetailsView/ListDetailsView.bind
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,8 @@
<controls:ListDetailsView BackButtonBehavior="Automatic"
ItemsSource="{Binding Emails}"
NoSelectionContent="Select an item to view"
CompactModeThresholdWidth="720">
CompactModeThresholdWidth="720"
ListPaneWidth="400">
<controls:ListDetailsView.ItemTemplate>
<DataTemplate>
<StackPanel Margin="0,8">
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5 changes: 4 additions & 1 deletion CommunityToolkit.WinUI.UI.Controls.Layout/ListDetailsView/ListDetailsView.cs
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Expand Up @@ -469,7 +469,10 @@ protected override void OnItemsChanged(object e)
/// </summary>
private void OnListPaneWidthChanged()
{
_twoPaneView.Pane1Length = new GridLength(ListPaneWidth);
if (_twoPaneView != null)
{
_twoPaneView.Pane1Length = new GridLength(ListPaneWidth);
}
}
}
}