教务网成绩查询工具（C#发送HTTP请求）

C#发送HTTP请求，实现登录、查询. // 设置参数 request = WebRequest.Create(posturl) as HttpWebRequest;//定义一个HTTP请求 CookieContainer cookieContainer = new CookieContainer();//定义一个Cookies容器 request.CookieContainer = cookieContainer; request.AllowAutoRedirect = true; request.Method = "POST";//设置请求方式POST request.Proxy = null;//不使用代理 request.ContentType = "application/x-www-form-urlencoded"; request.ContentLength = data.Length; outstream = request.GetRequestStream(); outstream.Write(data, 0, data.Length); outstream.Close(); //发送请求并获取相应回应数据 response = request.GetResponse() as HttpWebResponse; cookieContainer = request.CookieContainer;//保存Cookies //直到request.GetResponse()程序才开始向目标网页发送Post请求 instream = response.GetResponseStream(); sr = new StreamReader(instream, encoding); //返回结果网页（html）代码