C# Unicode编码解码

   public static string ToUnicodeString(this string str)
        {
            StringBuilder strResult = new StringBuilder();
            if (!string.IsNullOrEmpty(str))
            {
                for (int i = 0; i < str.Length; i++)
                {
                    strResult.Append("\\u");
                    strResult.Append(((int)str[i]).ToString("x"));
                }
            }
            return strResult.ToString();
        }

        public static string FromUnicodeString(this string str)
        {
            //最直接的方法Regex.Unescape(str);
            StringBuilder strResult = new StringBuilder();
            if (!string.IsNullOrEmpty(str))
            {
                string[] strlist = str.Replace("\\", "").Split('u');
                try
                {
                    for (int i = 1; i < strlist.Length; i++)
                    {
                        int charCode = Convert.ToInt32(strlist[i], 16);
                        strResult.Append((char)charCode);
                    }
                }
                catch (FormatException ex)
                {
                    return Regex.Unescape(str);
                }
            }
            return strResult.ToString();
        }

   string str = "我是***";
            string unicodeStr = str.ToUnicodeString();

            string chStr = unicodeStr.FromUnicodeString();