Solution:
1. textbox 2. Add the preceding three attributes to textblock.
Textwrapping = "Wrap" horizontalscrollbarvisibility = "disabled" acceptsreturn = "true"
Solution Process:
To enable the textblock to automatically wrap a line and display a vertical scroll bar when the height is specified, I added the textblock package to scrollviewer. In order to use scrollviewer, only the vertical scroll bar is displayed, I set the horizontalscrollbarvisibility attribute of scrollviewer to "hidden", but set textblock. after the textwrapping attribute is "Wrap", we find that there is still no line break. Think carefully because although you want textblock to be able to wrap, the width of the control is greatly increased by the text in it, therefore, textblock does not require line breaks. After checking the results, set the scrollviewer. horizontalscrollbarvisibility attribute to "disabled" with a try.
From: yinguang China