C# AES加密解密算法

/// <summary>
        /// AES加密
        /// </summary>
        /// <param name="encryptStr">明文</param>
        /// <param name="key">密钥</param>
        /// <returns></returns>
        public static string Encrypt(string encryptStr,string key)
        {
            byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);
            byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(encryptStr);
            RijndaelManaged rDel = new RijndaelManaged();
            rDel.Key = keyArray;
            rDel.Mode = CipherMode.ECB;
            rDel.Padding = PaddingMode.PKCS7;
            ICryptoTransform cTransform = rDel.CreateEncryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, , toEncryptArray.Length);
            return Convert.ToBase64String(resultArray, , resultArray.Length);
        }
        /// <summary>
        /// AES解密
        /// </summary>
        /// <param name="decryptStr">密文</param>
        /// <param name="key">密钥</param>
        /// <returns></returns>
        public static string Decrypt(string decryptStr,string key)
        {
            byte[] keyArray = UTF8Encoding.UTF8.GetBytes(key);
            byte[] toEncryptArray = Convert.FromBase64String(decryptStr);
            RijndaelManaged rDel = new RijndaelManaged();
            rDel.Key = keyArray;
            rDel.Mode = CipherMode.ECB;
            rDel.Padding = PaddingMode.PKCS7;
            ICryptoTransform cTransform = rDel.CreateDecryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, , toEncryptArray.Length);
            return UTF8Encoding.UTF8.GetString(resultArray);
        }