圖片OCR識別

using System;
using Newtonsoft.Json;
using Aliyun.Acs.Core;
using Aliyun.Acs.Core.Http;
using Aliyun.Acs.Core.Profile;
using Aliyun.Acs.Green.Model.V20180509;
using System.Collections.Generic;

namespace csharp_sdk_sample
{
    class Program
    {
        static void Main(string[] args)
        {
            /**
             * 常見擷取環境變數方式：
             *     擷取RAM使用者AccessKey ID：Environment.GetEnvironmentVariable("ALIBABA_CLOUD_ACCESS_KEY_ID");
             *     擷取RAM使用者AccessKey Secret：Environment.GetEnvironmentVariable("ALIBABA_CLOUD_ACCESS_KEY_SECRET");
             */
            DefaultProfile profile = DefaultProfile.GetProfile(
                    "cn-shanghai",
                    "建議從環境變數中擷取RAM使用者AccessKey ID",
                    "建議從環境變數中擷取RAM使用者AccessKey Secret");
            DefaultAcsClient client = new DefaultAcsClient(profile);

            ImageSyncScanRequest request = new ImageSyncScanRequest();
            request.AcceptFormat = FormatType.JSON;
            request.ContentType = FormatType.JSON;
            request.Method = MethodType.POST;
            request.Encoding = "UTF-8";

            Dictionary<string, object> task1 = new Dictionary<string, object>();
            task1.Add("dataId", "檢測資料ID");
            //task1.Add("url", "待檢測圖片連結地址");
            task1.Add("url", "http://example.com/xx.jpg");

            // 樣本：身份證正面識別。
            Dictionary<string, object> cardExtras = new Dictionary<string, object>();
            cardExtras.Add("card", "id-card-front");

            Dictionary<string, object> httpBody = new Dictionary<string, object>();
            // scenes：檢測情境。
            httpBody.Add("scenes", new List<string> { "ocr" });
            httpBody.Add("bizType", "業務情境");
            httpBody.Add("extras", cardExtras);
            httpBody.Add("tasks", new List<Dictionary<string, object>> { task1 });

            request.SetContent(System.Text.Encoding.Default.GetBytes(JsonConvert.SerializeObject(httpBody)), "utf-8", FormatType.JSON);
            try
            {
                ImageSyncScanResponse response = client.GetAcsResponse(request);
                if (response.HttpResponse.Status != 200)
                {
                    Console.WriteLine("the request failed. status:{0}", response.HttpResponse.Status);
                }
                Console.WriteLine(System.Text.Encoding.Default.GetString(response.HttpResponse.Content));
            }
            catch (Exception ex)
            {
                Console.WriteLine("Failed with error info: {0}", ex.Message);
            }
        }
    }
}