Why FontStretch does not work in WPF?

Question

I am trying setting FontStretch property on a TextBlock in WPF but it seems that it does not work. I tried Expanded, Condensed, etc. but the text appearance

Answer 1

By measuring some text (TextBlock.Measure), I find that Arial Narrow is × 0.82 the width of Arial.

So textBlock.LayoutTransform = new System.Windows.Media.ScaleTransform(0.82, 1.0); when applied to Arial might approximate Arial Narrow.