主题：[求助]如何通过Http直接发送二进制文件流

using System;
using System.Drawing;
using System.IO;
using System.Net;
namespace AiApi
{
    class Program
    {
        static void Main(string[] args)
        {
            string appKey = "5c6b*****************f4d85"; // your app_key
            string appSecret = "c83e******************6a9e"; // your app_secret
            string url = "https://ocr-api.ccint.com/cci_ai/service/v1/id_card"; // id_card
            var img = GetPictureData("example.jpg");
            using (var client = new WebClient())
            {
                try
                {
                    client.Headers.Add("app-key", appKey);
                    client.Headers.Add("app-secret", appSecret);
                    var response = client.UploadData(url, img);
                    string result= System.Text.Encoding.UTF8.GetString(response);
                    Console.WriteLine(result);
                }
                catch(WebException e)
                {
                    Console.WriteLine(e.Status);
                }
                Console.ReadLine();
            }
        }
        private static byte[] GetPictureData(string imagepath)
        {
            FileStream fs = new FileStream(imagepath, FileMode.Open);
            byte[] byData = new byte[fs.Length];
            fs.Read(byData, 0, byData.Length);
            fs.Close();
            return byData;
        }
    }
}