c#调用百度AI银行卡识别

code:

public class BankCard
    {
        // 银行卡识别
        public static BankCardModel bankCard(string token)
        {
            string host = "https://aip.baidubce.com/rest/2.0/ocr/v1/bankcard?access_token=" + token;
            Encoding encoding = Encoding.Default;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(host);
            request.Method = "post";
            request.KeepAlive = true;
            // 图片的base64编码
            string base64 = getFileBase64("c://card//bb.jpg");
            String str = "image=" + HttpUtility.UrlEncode(base64);
            byte[] buffer = encoding.GetBytes(str);
            request.ContentLength = buffer.Length;
            request.GetRequestStream().Write(buffer, 0, buffer.Length);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string result = reader.ReadToEnd();
            //Console.WriteLine("银行卡识别:");
            //Console.WriteLine(result);

            BankCardModel  bankCardModel = JsonConvert.DeserializeObject<BankCardModel>(result);

            return bankCardModel;
        }

        public static String getFileBase64(String fileName)
        {
            FileStream filestream = new FileStream(fileName, FileMode.Open);
            byte[] arr = new byte[filestream.Length];
            filestream.Read(arr, 0, (int)filestream.Length);
            string baser64 = Convert.ToBase64String(arr);
            filestream.Close();
            return baser64;
        }
    }

实体：

    public class BankCardModel
    {
        public BankCardModelItem result { get; set; }
    }

    public class BankCardModelItem
    {
        public string bank_card_number { get; set; }
        public string valid_date { get; set; }
    }