post方法
1 CookieContainer cookie = new CookieContainer(); 2 private string HttpPost(string Url, string postDataStr) 3 { 4 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url); 5 request.Method = "POST"; 6 request.ContentType = "application/x-www-form-urlencoded"; 7 request.ContentLength = Encoding.UTF8.GetByteCount(postDataStr); 8 request.CookieContainer = cookie; 9 Stream myRequestStream = request.GetRequestStream(); 10 StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312")); 11 myStreamWriter.Write(postDataStr); 12 myStreamWriter.Close(); 13 14 HttpWebResponse response = (HttpWebResponse)request.GetResponse(); 15 16 response.Cookies = cookie.GetCookies(response.ResponseUri); 17 Stream myResponseStream = response.GetResponseStream(); 18 StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8")); 19 string retString = myStreamReader.ReadToEnd(); 20 myStreamReader.Close(); 21 myResponseStream.Close(); 22 23 return retString; 24 }
在post的时候有时也用的到cookie，像登录163发邮件时候就需要发送cookie，所以在外部一个cookie属性随时保存 CookieContainer cookie = new CookieContainer();
！注意：有时候请求会重定向，但我们就需要从重定向url获取东西，像QQ登录成功后获取sid，但上面的会自动根据重定向地址跳转。我们可以用:
request.AllowAutoRedirect = false;设置重定向禁用，你就可以从headers的Location属性中获取重定向地址
