利用WebClient和WebRequest类获得网页源代码代码,Asp.Net代码库,德仔网

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【Asp.Net】利用WebClient和WebRequest类获得网页源代码
作者:Dezai.CN / 发布于2012/3/22/ 532
利用WebClient和WebRequest类获得网页源代码
<div>GetPageHtml.aspx
<%@ Page language="c#" validateRequest = "false"  Codebehind="GetPageHtml.aspx.cs" 
AutoEventWireup="false"  Inherits="eMeng.Exam.GetPageHtml" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD  HTML 4.0 Transitional//EN"  >
<HTML>
<HEAD>
<title>得到网页源代码</title>
<meta  name="GENERATOR" Content="Microsoft Visual Studio 7.0">
<meta  name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript"  content="JavaScript">
<meta name="vs_targetSchema"  content="http://schemas.microsoft.com/intellisense/ie5";>
</HEAD>
<body  MS_POSITIONING="GridLayout">
<form id="aspNetBuffer" method="post"  runat="server">
<div align="center" style="FONT-WEIGHT:  bold">得到任意网页源代码</div>
<asp:TextBox id="UrlText" runat="server"  Width="400px">http://dotnet.aspx.cc/content.aspx
</asp:TextBox>
<asp:Button  id="WebClientButton" Runat="server"  Text="用WebClient得到"></asp:Button>
<asp:Button  id="WebRequestButton" runat="server"  Text="用WebRequest得到"></asp:Button>

<asp:TextBox  id="ContentHtml" runat="server" Width="100%" Height="360px"  TextMode="MultiLine">
</asp:TextBox>
</form>
</body>
</HTML>

GetPageHtml.aspx.cs
using System;
using  System.Collections;
using System.ComponentModel;
using  System.Data;
using System.Drawing;
using System.Web;
using  System.Web.SessionState;
using System.Web.UI;
using  System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using  System.IO;
using System.Net;
using System.Text;
namespace eMeng.Exam
{
/// <summary>
/// GetPageHtml  的摘要说明。
/// </summary>
public class GetPageHtml :  System.Web.UI.Page
{
protected System.Web.UI.WebControls.Button  WebClientButton;
protected System.Web.UI.WebControls.Button  WebRequestButton;
protected System.Web.UI.WebControls.TextBox  ContentHtml;
protected System.Web.UI.WebControls.TextBox UrlText;
private  string PageUrl = "";
private void Page_Load(object sender, System.EventArgs e)
{}
#region Web Form Designer generated code
override protected void  OnInit(EventArgs e)
{
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
///  </summary>
private void InitializeComponent()
{  
this.WebClientButton.Click += new  System.EventHandler(this.WebClientButton_Click);
this.WebRequestButton.Click  += new System.EventHandler(this.WebRequestButton_Click);
this.Load += new  System.EventHandler(this.Page_Load);
}
#endregion
private void WebClientButton_Click(object sender, System.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：
/// ***************代码开始**********
/// Stream resStream =  wc.OpenRead(PageUrl);
/// StreamReader sr = new  StreamReader(resStream,System.Text.Encoding.Default);
/// ContentHtml.Text =  sr.ReadToEnd();
/// resStream.Close();
///  **************代码结束********
/// 
wc.Dispose(); 
}
private void WebRequestButton_Click(object sender, System.EventArgs  e)
{
PageUrl = UrlText.Text;
WebRequest request =  WebRequest.Create(PageUrl);
WebResponse response =  request.GetResponse();
Stream resStream = response.GetResponseStream();  
StreamReader sr = new StreamReader(resStream,  System.Text.Encoding.Default);
ContentHtml.Text =  sr.ReadToEnd();
resStream.Close(); 
sr.Close();
}
}
} 

</div>
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