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public string AES_decrypt(string encryptedDataStr, string key, string iv)    

        {    

            RijndaelManaged rijalg = new RijndaelManaged();    

            //-----------------      

            //设置 cipher 格式 AES-128-CBC      

            rijalg.KeySize = 128;    

            rijalg.Padding = PaddingMode.PKCS7;    

            rijalg.Mode = CipherMode.CBC;    

            rijalg.Key = Convert.FromBase64String(key);    

            rijalg.IV = Convert.FromBase64String(iv);    

            byte[] encryptedData= Convert.FromBase64String(encryptedDataStr);    

            //解密      

            ICryptoTransform decryptor = rijalg.CreateDecryptor(rijalg.Key, rijalg.IV);    

            string result;    

            using (MemoryStream msDecrypt = new MemoryStream(encryptedData))    

            {    

                using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))    

                {