Asp.Net \uxxx Unicode编码解码

/// <summary>
        /// Unicode编码(汉字转换为\uxxx)
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string EnUnicode(string str)
        {
            StringBuilder strResult = new StringBuilder();
            if (!string.IsNullOrEmpty(str))
            {
                for (int i = ; i < str.Length; i++)
                {
                    strResult.Append("\\u");
                    strResult.Append(((int)str[i]).ToString("x"));
                }
            }
            return strResult.ToString();
        }

        /// <summary>
        /// Unicode解码（\uxxxx转换为汉字）
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string DeUnicode(string str)
        {
            //最直接的方法Regex.Unescape(str);
            Regex reg = new Regex(@"(?i)\\[uU]([0-9a-f]{4})");
            return reg.Replace(str, delegate(Match m) { return ((char)Convert.ToInt32(m.Groups[].Value, )).ToString(); });
        }

/// <summary>
    /// 汉字转换为Unicode编码（测试）
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static string StringToUnicode(string str)
    {
        string result = "";
        for (int i = ; i < str.Length; i++)
        {
            result += "&#" + (int)(str.Substring(i, ).ToCharArray()[]) + ";";
        }
        return result;
    }