c# - 如何在 C# 中发出 http 请求并获得响应

Question

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Answer 1

首先要知道服务器是如何接受请求的，最有可能是post方法，因为你必须输入用户名和密码，然后你必须得到输入的字符串，可以得到用一个 一些浏览器扩展，例如 Live Http Headers . 它应该看起来像这样

http://yourwebsite/extension

POST /extension HTTP/1.1
Host: yourwebsite
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Length: 85
Content-Type: application/x-www-form-urlencoded
Connection: keep-alive
HereShouldBeThePoststring

然后您将使用网站 url 创建一个 httpwebrequest

            using System.Net;
            string postUrl = "YourWebsiteUrlWithYourExtension";
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(postUrl);

然后你会发布你的数据

  string postString = "ThePostStringYouObtainedUsingLiveHttpHeaders";
            request.Method = "POST";
            byte[] Content = Encoding.ASCII.GetBytes(postString);
            request.ContentLength = Content.Length;
            using (Stream stream = request.GetRequestStream())
            {
                stream.W

然后你会得到响应字符串

 string responsestring = null;
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            using (StreamReader reader = new StreamReader(response.GetResponseStream()))
            {
                responsestring = reader.ReadToEnd();
            }

然后您将解析您的字符串以获取您需要的数据。 一个好的解析库是 Html Agility Pack .