public class TransferCode

    {

        #region base-64编码、解码

        /// <summary>

        /// BASE64编码

        /// </summary>

        /// <param name="s"></param>

        /// <returns></returns>

        public static string Base64Encode(string s)

        {

            try

            {

                s = Convert.ToBase64String(Encoding.Default.GetBytes(s));

                return Convert.ToBase64String(Encoding.Default.GetBytes(s));

            }

            catch

            {

                return null;

            }

        }

        /// <summary>

        /// BASE64解码

        /// </summary>

        /// <param name="s"></param>

        /// <param name="encode"></param>

        /// <returns></returns>

        public static string Base64Decode(string s)

        {

            try

            {

                s = Encoding.Default.GetString(Convert.FromBase64String(s));

                return Encoding.Default.GetString(Convert.FromBase64String(s));

            }

            catch

            {

                return null;

            }

        }

        #endregion

        #region url编码、解码

        /// <summary>

        /// URL编码

        /// </summary>

        /// <param name="s"></param>

        /// <returns></returns>

        public static string UrlEncode(string s)

        {

            return System.Web.HttpUtility.UrlEncode(s);

        }

        /// <summary>

        /// URL解码

        /// </summary>

        /// <param name="s"></param>

        /// <returns></returns>

        public static string UrlDecode(string s)

        {

            return System.Web.HttpUtility.UrlDecode(s);

        }

        #endregion

        /// <summary>

        /// <summary>

        /// 字符串转Unicode

        /// </summary>

        /// <param name="source">源字符串</param>

        /// <returns>Unicode编码后的字符串</returns>

        public static string String2Unicode(string source)

        {

            byte[] bytes = Encoding.Unicode.GetBytes(source);

            StringBuilder stringBuilder = new StringBuilder();

            for (int i = 0; i < bytes.Length; i += 2)

            {

                stringBuilder.AppendFormat("\\u{0}{1}", bytes[i + 1].ToString("x").PadLeft(2, '0'), bytes[i].ToString("x").PadLeft(2, '0'));

            }

            return stringBuilder.ToString();

        }

    }