WebClient和WebRequest获取html代码

HTML:

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!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 id="Head1" runat="server">
    <title>得到网页源代码</title>
</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" OnClick="WebClientButton_Click"></asp:Button>
      <asp:Button id="WebRequestButton" runat="server" Text="用WebRequest得到" OnClick="WebRequestButton_Click"></asp:Button>
      
      <asp:TextBox id="ContentHtml" runat="server" Width="100%" Height="360px" TextMode="MultiLine">
       </asp:TextBox>
    </form>
  </body>
</html>

ASPX:

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;
public partial class _Default : System.Web.UI.Page
{
    private string PageUrl = "";
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    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：
        /// ***************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();
    }
    protected void WebRequestButton_Click(object sender, 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();

    }
}

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原文地址：https://www.cnblogs.com/sky-net/p/3853359.html