求助!!!
fileChanged = true;
int lineNo = richTextBox.GetLineFromCharIndex(richTextBox.SelectionStart) + 1;
Point currentPos = richTextBox.GetPositionFromCharIndex(richTextBox.SelectionStart);
Point firstPos = new Point(1,currentPos.Y);
int firstIndex = richTextBox.GetCharIndexFromPosition(firstPos);
int colNo = richTextBox.SelectionStart - firstIndex + 1;
哪位帮我解释一下阿,非常感谢!