如何在 RichTextBox 中获取选择的方向？

Question

RichTextBox用户可以选择向前或向后的文本。如何以编程方式确定选择的方向？（的LogicalDirection和End并不Start表示这一点）

Answer 1

您可以将CaretPosition与当前进行比较Selection以确定选择文本的方向：

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.

}