SDK using nails.

(1) to download the SDK https://open-doc.dingtalk.com/microapp/faquestions/vzbp02

(2) introducing

using DingTalk.Api;
using DingTalk.Api.Request;
using DingTalk.Api.Response;

　　

(3) obtain AccessToken

   string appkey = "dingt1s1h82ctf6wyy11";
        string appSec = "NKfjZJrNlZUIhcJPVURipXi9V6cduQcc5T5hBEJu5pyrWi7yCOVMGILtq6ELqU11";

        IDingTalkClient client = new DefaultDingTalkClient("https://oapi.dingtalk.com/gettoken");

        OapiGettokenRequest req=new OapiGettokenRequest();

      
        req.Appsecret = appSec;
        req.Appkey = appkey;
        req.SetHttpMethod("GET");
     
        OapiGettokenResponse res = null;
        res = client.Execute(req);
        
        Response.Write(res.AccessToken);