如何在RichTextBox中获取选择的方向?

你可以比较 CaretPosition 顺流而下 Selection 要确定文本是从哪个方向选择的,请执行以下操作:

TextPointer caretPos = richTextBox.CaretPosition;
TextPointer selectStart = richTextBox.Selection.Start;
TextPointer selectEnd = richTextBox.Selection.End;

if(caretPos.CompareTo(selectStart) == 0)
{
    //The text was selected from right to left.
}
else if(caretPos.CompareTo(selectEnd) == 0)
{
    //The text was selected from left to right.
}