ASP.NET抓取网页内容的实现方法

/// <summary>方法一：比较推荐  
/// 用HttpWebRequest取得网页源码  
/// 对于带BOM的网页很有效，不管是什么编码都能正确识别  
/// </summary>  
/// <param name="url">网页地址" </param>  
/// <returns>返回网页源文件</returns>  
public static string GetHtmlSource2(string url)  
{  
    //处理内容  
    string html = "";  
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);  
    request.Accept = "*/*"; //接受任意文件  
    request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.1.4322)"; //   
    request.AllowAutoRedirect = true;//是否允许302  
    //request.CookieContainer = new CookieContainer();//cookie容器，  
    request.Referer = url; //当前页面的引用  
    HttpWebResponse response = (HttpWebResponse)request.GetResponse();  
    Stream stream = response.GetResponseStream();  
    StreamReader reader = new StreamReader(stream, Encoding.Default);  
    html = reader.ReadToEnd();  
    stream.Close();  
    return html;  
}

public static string GetHttpData2(string Url)  
{  
    string sException = null;  
    string sRslt = null;  
    WebResponse oWebRps = null;  
    WebRequest oWebRqst = WebRequest.Create(Url);  
    oWebRqst.Timeout = 50000;  
    try  
    {  
        oWebRps = oWebRqst.GetResponse();  
    }  
    catch (WebException e)  
    {  
        sException = e.Message.ToString();  
    }  
    catch (Exception e)  
    {  
        sException = e.ToString();  
    }  
    finally  
    {  
        if (oWebRps != null)  
        {  
            StreamReader oStreamRd = new StreamReader(oWebRps.GetResponseStream(), Encoding.GetEncoding("utf-8"));  
            sRslt = oStreamRd.ReadToEnd();  
            oStreamRd.Close();  
            oWebRps.Close();  
        }  
    }  
    return sRslt;  
}