如何使用FormUrlEncodedContent

Question

我想发布一个http请求，以便使用HttpClient和FormUrlEncodedContent登录到网站。我可以跟踪应如何在chrome浏览器上显示响应，但是当我重新创建浏览器发出的发布请求时，却没有得到预期的响应。我要登录的网站是https://www.lectio.dk/lectio/31/login.aspx。

我猜想我应该为FormUrlEncodedContent提供什么（使用chrome中的网络标签，我可以看到请求标头和表单数据，但是如何选择应该提供的内容？）。目前，我的代码如下所示。

CookieContainer container = new CookieContainer();
            HttpClientHandler handler = new HttpClientHandler();
            handler.CookieContainer = container;
            HttpClient client = new HttpClient(handler);
            Console.WriteLine(client.DefaultRequestHeaders + "\n" + "--------------------------");

            Dictionary<string, string> vals = new Dictionary<string, string>
            {
                {"user-agent","Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36"},
                {"accept-language","en-GB,en-AS;q=0.9,en-DK;q=0.8,en;q=0.7,da-DK;q=0.6,da;q=0.5,en-US;q=0.4"},
                {"accept-encoding","gzip, deflate, br"},
                {"accept","text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3"},
                {"m$Content$username2","username"},
                {"m$Content$passwordHidden","password"},
                {"__EVENTTARGET","m$Content$submitbtn2"},

            };
            FormUrlEncodedContent content = new FormUrlEncodedContent(vals);
            var response = client.PostAsync("https://www.lectio.dk/lectio/31/login.aspx", content);
            var responseString = response.Result;
            Console.WriteLine(responseString);
            handler.Dispose();
            client.Dispose();

这个想法是要登录到网站（我想我的Cookie容器会解决这个问题？），以便我可以刮除som数据。