C# 获取源代码

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net;
using System.Text;
using System.IO;

public partial class _Default : System.Web.UI.Page 
{
    /// <summary>
    /// 塗聚文
    /// 涂聚文
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void Page_Load(object sender, EventArgs e)
    {
        //获取URL地址
        string url = Request.Url.ToString();
        txtUrl.Text = url;
        //获取IP地址
        string ips= Request.UserHostAddress.ToString();
        txtIp.Text = ips;
        //浏览器
        string fr = Request.Browser.Type.ToString();
        txtbrows.Text = fr;
        string cp ;//= Request.UserAgent.ToString()
        //操作系统
        cp=GetOSNameByUserAgent(Request.UserAgent.ToString());
        txtcp.Text = cp;
        //浏览器版本号
        //this.txtbrows.Text = Request.Browser.ClrVersion.ToString();
       // txtUrl.Text = Request.ServerVariables["http_referer"];
    }

    protected void btnGet_Click(object sender, EventArgs e)
    {
        txtUrl.Text = Request.ServerVariables["http_referer"];//ServerViables["http_referer"];
        string strurl= txtUrl.Text.ToString(); //欲获取的网页地址 要  http://
        WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient

        //获取或设置用于对向 Internet 资源的请求进行身份验证的网络凭据。
        myWebClient.Credentials = CredentialCache.DefaultCredentials;
       // Request.ServerVariables("HTTP_HOST");
        //从资源下载数据并返回字节数组。（加@是因为网址中间有"/"符号）
        byte[] pagedata = myWebClient.DownloadData(@strurl);
       
       string result = Encoding.Default.GetString(pagedata); //如果获取网站页面采用的是GB2312，则使用这句
        //string result = Encoding.UTF8.GetString(pagedata); //如果获取网站页面采用的是UTF-8，则使用这句
        Response.Write(result); //在WEB页中显示获取的内容
        Panel1.Visible = false;

    }
    /// <summary>  
    /// 根据 User Agent 获取操作系统名称  
    /// </summary>  
    private string GetOSNameByUserAgent(string userAgent)
    {
        string osVersion = "未知";
        if (userAgent.Contains("NT 6.2"))
        {
            osVersion = "Windows 8/Windows Server 2012";
        }
        else if (userAgent.Contains("NT 6.1"))
        {
            osVersion = "Windows 7/Windows Server 2008 R2";
        }
        else if (userAgent.Contains("NT 6.0"))
        {
            osVersion = "Windows Vista/Server 2008";
        }
        else if (userAgent.Contains("NT 5.2"))
        {
            osVersion = "Windows Server 2003";
        }
        else if (userAgent.Contains("NT 5.1"))
        {
            osVersion = "Windows XP";
        }
        else if (userAgent.Contains("NT 5"))
        {
            osVersion = "Windows 2000";
        }
        else if (userAgent.Contains("NT 4"))
        {
            osVersion = "Windows NT4";
        }
        else if (userAgent.Contains("Me"))
        {
            osVersion = "Windows Me";
        }
        else if (userAgent.Contains("98"))
        {
            osVersion = "Windows 98";
        }
        else if (userAgent.Contains("95"))
        {
            osVersion = "Windows 95";
        }
        else if (userAgent.Contains("Mac"))
        {
            osVersion = "Mac";
        }
        else if (userAgent.Contains("Unix"))
        {
            osVersion = "UNIX";
        }
        else if (userAgent.Contains("Linux"))
        {
            osVersion = "Linux";
        }
        else if (userAgent.Contains("SunOS"))
        {
            osVersion = "SunOS";
        }
        return osVersion;
    } 
    /// <summary>

    /// 获取源代码

    /// </summary>

    /// <param name="url"></param>

    /// <param name="encoding"></param>

    /// <returns></returns>

    public static string GetPage(string url, Encoding encoding)
    {

        HttpWebRequest request = null;

        HttpWebResponse response = null;

        StreamReader reader = null;

        try
        {

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

            request.UserAgent = "www.dupcit.com";

            request.Timeout = 20000;

            request.AllowAutoRedirect = false;



            response = (HttpWebResponse)request.GetResponse();

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

                reader = new StreamReader(response.GetResponseStream(), encoding);

                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;

    }
}