利用.NET的 WebClient类 和 WebRequest类，我们可以很容易地得到给定URL地址的源代码。主要代码如下：
GetPage.aspx：
程序代码<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>获取任意网页HTML代码</title>
</head>
<body>
<form id="form1" runat="server">
<div style="text-align:center;">
<asp:TextBox ID="UrlText" runat="server" Width="400" Text="http://www.gsdesign.cn"></asp:TextBox>
<asp:Button ID="WebClientButton" runat="server" Text="用WebClient得到" OnClick="WebClientButton_Click" />
<asp:Button ID="WebRequestButton" runat="server" Text="用WebRequest得到" OnClick="WebRequestButton_Click" />
<br />
<asp:TextBox ID="ContentHtml" runat="server" Width="100%" Height="360" TextMode="MultiLine"></asp:TextBox>
</div>
</form>
</body>
</html>
GetPage.aspx.cs：
程序代码using System.IO;
using System.Web;
using System.Web.UI;
using System.Text;
using System.Net;
public partial class GetPage : System.Web.UI.Page
{
private string pageUrl = "";
protected void Page_Load(object sender, EventArgs e)
{
}
/// <summary>
/// 使用WebClient方法
/// </summary>
protected void WebClientButton_Click(object sender, EventArgs e)
{
pageUrl = UrlText.Text;
WebClient wc = new WebClient();
wc.Credentials = CredentialCache.DefaultCredentials;
//方法一
byte[] pageData = wc.DownloadData(pageUrl);
ContentHtml.Text = Encoding.Default.GetString(pageData);
/*
//方法二
Stream resStream = wc.OpenRead(pageurl);
StreamReader sr = new StreamReader(resStream, Encoding.Default);
ContentHtml.Text = sr.ReadToEnd();
resStream.Close();
*/
wc.Dispose();
}
/// <summary>
/// 使用WebRequest方法
/// </summary>
protected void WebRequestButton_Click(object sender, EventArgs e)
{
pageUrl = UrlText.Text;
WebRequest wrequest = WebRequest.Create(pageUrl);
WebResponse wresponse = wrequest.GetResponse();
Stream resStream = wresponse.GetResponseStream();
StreamReader sr = new StreamReader(resStream, Encoding.Default);
ContentHtml.Text = sr.ReadToEnd();
resStream.Close();
sr.Close();
}
}