ASP.NET使用HttpWebRequest读取远程网页源代码

public string GetPage(string url)
{

 HttpWebRequest request = null;

 HttpWebResponse response = null;

 StreamReader reader = null;

 try
 {

 request = (HttpWebRequest)WebRequest.Create(url);

 request.Timeout = 20000;

 request.AllowAutoRedirect = false;

 response = (HttpWebResponse)request.GetResponse();

 if (response.StatusCode == HttpStatusCode.OK && response.ContentLength < 1024 * 1024)
 {

 reader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.Default);

 string html = reader.ReadToEnd();

 return html;

 }

 }

 catch
 {

 }

 finally
 {

 if (response != null)
 {

 response.Close();

 response = null;

 }

 if (reader != null)

 reader.Close();

 if (request != null)

 request = null;

 }

 return string.Empty;
}