When editing text the user is able to use the keybord shift button and direction keys to modify the selection - one position stays anchored while the other moves. By pressing left it is possible to get the movable part on the left of the anchored part.When editing text the user is able to use the k
阅读背景：
WPF TextBox - 以编程方式选择文本，同时保留“选择方向”
来源：互联网
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