这必须有效，它与上记录的相同MSDN [ ^ ] ...你为什么这么想没有正确转换？

This must work, it is the same as documented on the MSDN[^]... Why do you think it is not converted correctly?

我认为（但我不确定）这是编码问题。

试试这个：

Hi,

I think (but I'm not sure) it's an encoding problem.
Try this:

string s = System.IO.File.ReadAllText(path, Encoding.UTF8);
 RichTextBox rtb = new RichTextBox();
          rtb.Rtf = s;
          return rtb.Text;

希望这会有所帮助。

Hope this helps.