RTF文件内容的字符串读取

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace RTF格式与普通String字符互转Demo
{
    class Program
    {
        static void Main(string[] args)
        {
            System.Windows.Forms.RichTextBox rtxb = new System.Windows.Forms.RichTextBox();

            //1.普通字符串生成 a.rtf文件
            string word = "Hi China,好好学习";
            rtxb.AppendText(word);
            rtxb.SaveFile("a.rtf");

            //2.读取a.rtf文件,可以看到输出是一串不能直观看出来的字符
            string rtfText = File.ReadAllText("a.rtf");
            Console.WriteLine(rtfText);
            /*输出字符为: 
             * {\rtf1\ansi\ansicpg936\deff0\deflang1033\deflangfe2052{\fonttbl{\f0\fnil\fcharset134 \'cb\'ce\'cc\'e5;}}
                \viewkind4\uc1\pard\lang2052\f0\fs18 Hi China,\'ba\'c3\'ba\'c3\'d1\'a7\'cf\'b0\par
                            }
                            */

            //3.将 a.rtf的字符串 rtfText 转为普通字符