C#類比http 發送post或get請求

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private string HttpPost(string Url, string postDataStr)        {            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);            request.Method = "POST";            request.ContentType = "application/x-www-form-urlencoded";            request.ContentLength = Encoding.UTF8.GetByteCount(postDataStr);            request.CookieContainer = cookie;            Stream myRequestStream = request.GetRequestStream();            StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("gb2312"));            myStreamWriter.Write(postDataStr);            myStreamWriter.Close();             HttpWebResponse response = (HttpWebResponse)request.GetResponse();             response.Cookies = cookie.GetCookies(response.ResponseUri);            Stream myResponseStream = response.GetResponseStream();            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));            string retString = myStreamReader.ReadToEnd();            myStreamReader.Close();            myResponseStream.Close();             return retString;        }         public string HttpGet(string Url, string postDataStr)        {            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url + (postDataStr == "" ? "" : "?") + postDataStr);            request.Method = "GET";            request.ContentType = "text/html;charset=UTF-8";             HttpWebResponse response = (HttpWebResponse)request.GetResponse();            Stream myResponseStream = response.GetResponseStream();            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));            string retString = myStreamReader.ReadToEnd();            myStreamReader.Close();            myResponseStream.Close();             return retString;        }

　　

在post的時候有時也用的到cookie，像登入163發郵件時候就需要發送cookie，所以在外部一個cookie屬性隨時儲存 CookieContainer cookie = new CookieContainer();

！注意：有時候請求會重新導向，但我們就需要從重新導向url擷取東西，像QQ登入成功後擷取sid，但上面的會自動根據重新導向地址跳轉。我們可以用:
request.AllowAutoRedirect = false;設定重新導向禁用，你就可以從headers的Location屬性中擷取重新導向地址

C#類比http 發送post或get請求