C#访问网页的四种方式

 private string GetWebClient(string url)
 {
 string strHTML = "";
 WebClient myWebClient = new WebClient();
 Stream myStream = myWebClient.OpenRead(url);
 StreamReader sr = new StreamReader(myStream, System.Text.Encoding.GetEncoding("utf-8"));
 strHTML = sr.ReadToEnd();
 myStream.Close();
 return strHTML;
 }

private string GetWebRequest(string url)
 {
 Uri uri = new Uri(url);
 WebRequest myReq = WebRequest.Create(uri);
 WebResponse result = myReq.GetResponse();
 Stream receviceStream = result.GetResponseStream();
 StreamReader readerOfStream = new StreamReader(receviceStream, System.Text.Encoding.GetEncoding("utf-8"));
 string strHTML = readerOfStream.ReadToEnd();
 readerOfStream.Close();
 receviceStream.Close();
 result.Close();
 return strHTML;
 }