c#unicode，中文互转

   /// <summary>
        /// 中文转unicode
        /// </summary>
        /// <returns></returns>
        public static string unicode_0(string str)
        {
            string outStr = "";
            if (!string.IsNullOrEmpty(str))
            {
                for (int i = 0; i < str.Length; i++)
                {
                    outStr += "/u" + ((int)str[i]).ToString("x");
                }
            }
            return outStr;
        }
        /// <summary>
        /// unicode转中文
        /// </summary>
        /// <returns></returns>
        public static string unicode_1(string str)
        {
            string outStr = "";
            if (!string.IsNullOrEmpty(str))
            {
                string[] strlist = str.Replace("/", "").Split('u');
                try
                {
                    for (int i = 1; i < strlist.Length; i++)
                    {
                        //将unicode字符转为10进制整数，然后转为char中文字符  
                        outStr += (char)int.Parse(strlist[i], System.Globalization.NumberStyles.HexNumber);
                    }
                }
                catch (FormatException ex)
                {
                    outStr = ex.Message;
                }
            }
            return outStr;
        }


        /// <summary>
        /// unicode转中文（符合js规则的）
        /// </summary>
        /// <returns></returns>
        public static string unicode_js_1(string str)
        {
            string outStr = "";
            Regex reg = new Regex(@"(?i)\\u([0-9a-f]{4})");
            outStr = reg.Replace(str, delegate (Match m1)
            {
                return ((char)Convert.ToInt32(m1.Groups[1].Value, 16)).ToString();
            });
            return outStr;
        }
        /// <summary>
        /// 中文转unicode（符合js规则的）
        /// </summary>
        /// <returns></returns>
        public static string unicode_js_0(string str)
        {
            string outStr = "";
            string a = "";
            if (!string.IsNullOrEmpty(str))
            {
                for (int i = 0; i < str.Length; i++)
                {
                    if (Regex.IsMatch(str[i].ToString(), @"[\u4e00-\u9fa5]")) { outStr += "\\u" + ((int)str[i]).ToString("x"); }
                    else { outStr += str[i]; }
                }
            }
            return outStr;
        }
        /// <summary>
        /// JS 编码 escape()
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        private string Escape(string s)
        {
            StringBuilder sb = new StringBuilder();
            byte[] byteArr = System.Text.Encoding.Unicode.GetBytes(s);

            for (int i = 0; i < byteArr.Length; i += 2)
            {
                sb.Append("%u");
                sb.Append(byteArr[i + 1].ToString("X2"));//把字节转换为十六进制的字符串表现形式
                sb.Append(byteArr[i].ToString("X2"));
            }
            return sb.ToString();

        }
        /// <summary>
        /// JS 编码 UnEscape()
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        private string UnEscape(string s)
        {

            string str = s.Remove(0, 2);//删除最前面两个＂%u＂
            string[] strArr = str.Split(new string[] { "%u" }, StringSplitOptions.None);//以子字符串＂%u＂分隔
            byte[] byteArr = new byte[strArr.Length * 2];
            for (int i = 0, j = 0; i < strArr.Length; i++, j += 2)
            {
                byteArr[j + 1] = Convert.ToByte(strArr[i].Substring(0, 2), 16);  //把十六进制形式的字串符串转换为二进制字节
                byteArr[j] = Convert.ToByte(strArr[i].Substring(2, 2), 16);
            }
            str = System.Text.Encoding.Unicode.GetString(byteArr);　//把字节转为unicode编码
            return str;
        }