WPF TextBlock font resize to fill available space in a Grid

Question

I have some text that is displayed at run time in a textblock. I want the font size to be the biggest it can be to fill the area that is given. I think I have the textblock

Answer 1

Well, its not a "perfect" answer, but this is a quick hack (you can drop this into kaxaml and test it out):

The ViewBox will enlarge any content to fill its container. The problem is that the TextBlock, while it sizes to its text, has padding at the top and bottom that you can't get rid of (without doing some heavy lifting). This might get you closer to what you want, tho.