asp.net C# 获取网页源码的几种方式

System.Net.WebClient aWebClient = new System.Net.WebClient();
aWebClient.Encoding = System.Text.Encoding.Default;
Byte[] pageData = aWebClient.DownloadData(url);

string nhtml = Encoding.GetEncoding("utf-8").GetString(pageData);

System.Net.WebClient aWebClient = new System.Net.WebClient();
aWebClient.Encoding = System.Text.Encoding.Default;
string nhtml = aWebClient.DownloadString(goodstidurl);

WebBrowser webbrowser = new WebBrowser();
StreamReader sr = new StreamReader(this.webBTaobao.DocumentStream, Encoding.Default);
html = sr.ReadToEnd();
html = html.Replace("\r\n", "");
html = html.Replace("\n", "");
html = html.Replace("  ", "");
html = html.Replace("(", "");
html = html.Replace(")", "");
string nurl = Regex.Match(html, "(?<=data-url=\").*?(?=\")").Value;
//新建一个WebBrowser
WebBrowser webAddress = new WebBrowser();
webAddress.Navigate(nurl);
//等待加载完成
while (webAddress.ReadyState < WebBrowserReadyState.Complete) Application.DoEvents();
StreamReader sraddress = new StreamReader(webAddress.DocumentStream, Encoding.Default);
jsonaddress = sraddress.ReadToEnd();

WebRequest hwr = WebRequest.Create(@"http://item.taobao.com/item.htm?id=" + row["urlId"].ToString());//向指定Url发出请求
HttpWebResponse hwp = hwr.GetResponse() as HttpWebResponse;//将hwr对HTTP的请求
string text;
StreamReader sr;
string code = hwp.ContentType;//请求响应得到的内容类型
//得到编码了
code = code.Split('=')[1];
Stream rep = hwp.GetResponseStream();//将请求得到的内容以流的形式读出
sr = new StreamReader(rep, Encoding.GetEncoding(code));//用指定的字符编码为指定的流初始化