GridView column width does not update when changing ItemsSource

Question

I have a GridView where I'm setting the ItemsSource in code-behind. All columns in the grid are defined in XAML, and all column widths are "Auto". When I initially set ItemsSource of the grid, the column widths are set correctly.

Now, depending on the user's actions, the ItemsSource of the grid may be set to a new EntityCollection. What I have noticed is that the column widths remain as they were with the previous ItemsSource. That is, the column widths don't seem to adjust themselves automatically when a new ItemsSource is set for the Grid. Is there any way in code-behind or XAML to force the Grid to use the new ItemsSource when setting the column widths? I would think that this would be something that the GridView would do automatically when it's ItemsSource is reset.

<ScrollViewer VerticalScrollBarVisibility="Auto">
    <ListView>
        <ListView.View>
            <GridView>
                <GridView.Columns>
                    <GridViewColumn Width="Auto" Header="Status">
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <Image Width="16" Height="16" Source="{Binding Path=Blocking}" />
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                    <GridViewColumn Width="Auto" Header="Title">
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <TextBlock TextTrimming="CharacterEllipsis" Text="{Binding}" />
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                </GridView.Columns>
            </GridView>
        </ListView.View>
    </ListView>
</ScrollViewer>

Answer 1

Use this code after updating ItemsSource:

public void AutoSizeGridViewColumns(ListView listView) 
{ 
    GridView gridView = listView.View as GridView; 
    if (gridView != null)
    { 
        foreach (var column in gridView.Columns)
        {
            if (double.IsNaN(column.Width))
                column.Width = column.ActualWidth; 
            column.Width = double.NaN; 
        } 
    } 
}