/// <summary>        /// AES-256加密        /// </summary>        /// <param name="toEncrypt"></param>        /// <returns></returns>        public string Encrypt(string toEncrypt)        {            // 256-AES key                byte[] keyArray = UTF8Encoding.UTF8.GetBytes("12345678901234567890123456789012");            byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);            RijndaelManaged rDel = new RijndaelManaged();            rDel.Key = keyArray;            rDel.Mode = CipherMode.ECB;            rDel.Padding = PaddingMode.PKCS7;            ICryptoTransform cTransform = rDel.CreateEncryptor();            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);            return Convert.ToBase64String(resultArray, 0, resultArray.Length);        }        /// <summary>        /// 解密        /// </summary>        /// <param name="toDecrypt">要解密的数据</param>        /// <returns>解密好的数据</returns>        public string Decrypt(string toDecrypt)        {            // 256-AES key                byte[] keyArray = UTF8Encoding.UTF8.GetBytes("12345678901234567890123456789012");            byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);            RijndaelManaged rDel = new RijndaelManaged();            rDel.Key = keyArray;            rDel.Mode = CipherMode.ECB;            rDel.Padding = PaddingMode.PKCS7;            ICryptoTransform cTransform = rDel.CreateDecryptor();            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);            return UTF8Encoding.UTF8.GetString(resultArray);        }