TextBlock TextWrapping not wrapping

Question

When I place a TextBlock inside of a Horizontally Aligned StackPanel it does not wrap. I realize that this is because the available width of the StackPanel is PositiveInfini

Answer 1

It's because you're using Horizontal orientation on the StackPanel. That means that the StackPanel is giving full width to each child control, and then laying them out horizontally - even if that means exceeding its bounded/visible width. Because there's nothing to constrain the width of the TextBlock, it doesn't wrap.

If you switch to Vertical orientation then the wrapping works, but I'm guessing there's a reason for you specifying otherwise. Can you show what layout you're trying to achieve?