C#模拟Post和Get方式发送数据

通过应用程序读取网页信息的时候，通常需要抓取网页的数据，但是有一个问题就是很多网页需要登录后才能够获得页面数据，那么就需要保存当前的cookie，在.NET中可以使用CookieContainer 对象来保存登录后的Cookie信息，每次发送数据的时候加上Cookie信息，就可以解决这个问题了。

[code]        #region 同步通过POST方式发送数据/// <summary>/// 通过POST方式发送数据/// </summary>/// <param name=\"Url\">url</param>/// <param name=\"postDataStr\">Post数据</param>/// <param name=\"cookie\">Cookie容器</param>/// <returns></returns>public string SendDataByPost(string Url, string postDataStr, ref CookieContainer cookie){HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);if (cookie.Count == 0){request.CookieContainer = new CookieContainer();cookie = request.CookieContainer;}else{request.CookieContainer = cookie;}request.Method = \"POST\";request.ContentType = \"application/x-www-form-urlencoded\";request.ContentLength = postDataStr.Length;Stream myRequestStream = request.GetRequestStream();StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding(\"gb2312\"));myStreamWriter.Write(postDataStr);myStreamWriter.Close();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;}#endregion#region 同步通过GET方式发送数据/// <summary>/// 通过GET方式发送数据/// </summary>/// <param name=\"Url\">url</param>/// <param name=\"postDataStr\">GET数据</param>/// <param name=\"cookie\">GET容器</param>/// <returns></returns>public string SendDataByGET(string Url, string postDataStr, ref CookieContainer cookie){HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url + (postDataStr == \"\" ? \"\" : \"?\") + postDataStr);if (cookie.Count == 0){request.CookieContainer = new CookieContainer();cookie = request.CookieContainer;}else{request.CookieContainer = cookie;}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;}#endregion