dotnet publish CountDown.sln -c Release -r win-x64 /p:PublishSingleFile=true /p:PublishTrimmed=true /p:PublishReadyToRun=true /p:PublishReadyToRunShowWarnings=true /p:UseAppHost=true /p:IncludeNativeLibrariesForSelfExtract=true /p:SelfContained=true --self-contained true

using System.Collections.Generic;
using System.Diagnostics;
using System.Text.Json.Nodes;



string cookie = "";
var handler = new HttpClientHandler();
using (var httpClient = new HttpClient(handler))
{
    using (var request = new HttpRequestMessage(new HttpMethod("POST"), new Uri("https://cloud.yibailingshou.com/wsy_user/web/index.php?m=login&a=register_get_phone_code")))
    {

        var multipartContent = new MultipartFormDataContent();
        multipartContent.Add(new StringContent("17628818007"), "phone");
        multipartContent.Add(new StringContent("czo0OiI5NTY1Ijs"), "customer_id");
        multipartContent.Add(new StringContent("+86"), "country_code");
        multipartContent.Add(new StringContent(""), "captcha_token");//post data
        request.Headers.TryAddWithoutValidation("X-Requested-With", "XMLHttpRequest");//添加header
        request.Content = multipartContent;

        using (var response = await httpClient.SendAsync(request))
        {
            response.EnsureSuccessStatusCode();
            var body = await response.Content.ReadAsStringAsync();
            Console.WriteLine(body);// 响应正文
            Console.WriteLine(response);
            if (response.Headers.TryGetValues("Set-Cookie", out IEnumerable<string> cookieValues))
            {
                string ck = cookieValues.FirstOrDefault();//响应header中的Set-cookie
                Console.WriteLine(ck.Split(";")[0]);
            }
            dynamic result = JsonNode.Parse(body)!;//json解析
            if (result["errcode"].GetValue<int>() == 407)// json对象取值
            {
                //return "407";
            }
            else if (result["errcode"].GetValue<int>() == 0)
            {
                //return "0";
            }
            else
            {
                //return "false";
            }
        }

    }

}