Auto-sizing a window by height, based on the text contents of a TextBlock in WPF C#. Normally, wrapping a TextBlock in a ScrollViewer will show a vertical scrollbar if the text is too tall for the TextBlock. This handy code automatically resizes the TextBlock and Window height to compensate for the text, so the vertical scrollbar, hopefully, doe…

gistfile1.cs

<ScrollViewer Margin="2,34,0,0" Grid.RowSpan="2" Name="scrollViewer" VerticalScrollBarVisibility="Auto">
  <TextBlock Grid.Row="1" x:Name="tbMessage" TextWrapping="Wrap" Text="A long block of overflowing text goes here." />
</ScrollViewer>
            
private void OnLoaded(object sender, RoutedEventArgs e)
{
    // Adjust height of window to match text height. Scroll bars shouldn't show.
    if (scrollViewer.ComputedVerticalScrollBarVisibility == System.Windows.Visibility.Visible)
    {
        scrollViewer.Height += scrollViewer.ScrollableHeight;
        Height += scrollViewer.ScrollableHeight;
    }
}