[轉帖]利用WebClient和WebRequest類獲得網頁原始碼

weixin_34279184發表於2005-08-19
Webclient網頁原始碼
GetURLHtml.aspx

<%@ Page language="c#" Codebehind="GetURLHtml.aspx.cs" Src="GetURLHtml.aspx.cs" AutoEventWireup="false" Inherits="Lion.Web.Forum.WebForm1" %>
<HTML>
 <HEAD>
  <title>Lion互動網路=>利用WebClient和WebRequest類獲得網頁原始碼</title>
  <META http-equiv="Content-Type" content="text/html; charset=gb2312">
 </HEAD>
 <body>
  <form runat="server">
   <asp:TextBox id="UrlText" runat="server" Width="50%">http://www.lionsky.net/mywebsite/index.aspx<;/asp:TextBox>
   <asp:Button id="Button1" runat="server" Text="用WebClient得到"></asp:Button> 
   <asp:Button id="Button2" runat="server" Text="用WebRequest得到"></asp:Button><BR>
   <asp:TextBox id="ContentHtml" runat="server" Width="100%" Height="360px" TextMode="MultiLine"></asp:TextBox>
  </form>
 </body>
</HTML>

GetURLHtml.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;

namespace Lion.Web.Forum
{
 /// <summary>
 /// WebForm1 的摘要說明。
 /// </summary>
 public class WebForm1 : System.Web.UI.Page
 {
  protected System.Web.UI.WebControls.TextBox TextBox1;
  protected System.Web.UI.WebControls.Button Button1;
  protected System.Web.UI.WebControls.Button Button2;
  protected System.Web.UI.WebControls.TextBox UrlText;
  protected System.Web.UI.WebControls.TextBox ContentHtml;
  protected System.Web.UI.WebControls.TextBox TextBox2;
 
  #region Web 窗體設計器生成的程式碼
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN: 該呼叫是 ASP.NET Web 窗體設計器所必需的。
   //
   InitializeComponent();
   base.OnInit(e);
  }
 
  /// <summary>
  /// 設計器支援所需的方法 - 不要使用程式碼編輯器修改
  /// 此方法的內容。
  /// </summary>
  private void InitializeComponent()
  {    
   this.Button1.Click += new System.EventHandler(this.Button1_Click);
   this.Button2.Click += new System.EventHandler(this.Button2_Click);

  }
  #endregion

  private void Button1_Click(object sender, System.EventArgs e)
  {
   string PageUrl = UrlText.Text;
   System.Net.WebClient wc = new System.Net.WebClient();
   wc.Credentials = System.Net.CredentialCache.DefaultCredentials;

   ///方法一：
   Byte[] pageData = wc.DownloadData(PageUrl);
   ContentHtml.Text = System.Text.Encoding.Default.GetString(pageData);

   /// 方法二：
   /// ***************程式碼開始**********
   /// Stream resStream = wc.OpenRead(PageUrl);
   /// StreamReader sr = new StreamReader(resStream,System.Text.Encoding.Default);
   /// ContentHtml.Text = sr.ReadToEnd();
   /// resStream.Close();
   /// **************程式碼結束********
   ///
   wc.Dispose();  

  }

  private void Button2_Click(object sender, System.EventArgs e)
  {
   string PageUrl = UrlText.Text;
   System.Net.WebRequest  request = System.Net.WebRequest.Create(PageUrl);
   System.Net.WebResponse response = request.GetResponse();
   System.IO.Stream resStream = response.GetResponseStream();
   System.IO.StreamReader sr = new System.IO.StreamReader(resStream, System.Text.Encoding.Default);
   ContentHtml.Text = sr.ReadToEnd();
   resStream.Close();
   sr.Close();

  }
 }
}

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