该方法经过对各大门户网站测试结果是抓取率100%！
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效果图
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后台代码：
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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.Text.RegularExpressions;
using System.Net;
using System.IO;
using System.Collections;
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public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
}
}
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protected void Button1_Click(object sender, EventArgs e)
{
TextBox2.Text = “”;
string web_url = this.TextBox1.Text;//”http://blog.csdn.net/21aspnet/”
string all_code = “”;
HttpWebRequest all_codeRequest = (HttpWebRequest)WebRequest.Create(web_url);
WebResponse all_codeResponse = all_codeRequest.GetResponse();
StreamReader the_Reader = new StreamReader(all_codeResponse.GetResponseStream());
all_code = the_Reader.ReadToEnd();
the_Reader.Close();
ArrayList my_list = new ArrayList();
string p = @”http://([\\w-]+\\.)+[\\w-]+(/[\\w- ./?%&=]*)?”;
Regex re = new Regex(p, RegexOptions.IgnoreCase);
MatchCollection mc = re.Matches(all_code);
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for (int i = 0; i <= mc.Count – 1; i++)
{
bool _foo = false;
string name = mc[i].ToString();
foreach (string list in my_list)
{
if (name == list)
{
_foo = true;
break;
}
}//过滤
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if (!_foo)
{
TextBox2.Text += name + “\\n”;
}
}
}
}
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前台
<%@ Page Language=”C#” AutoEventWireup=”true” CodeFile=”Default.aspx.cs” Inherits=”_Default” %>
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<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
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<html xmlns=”http://www.w3.org/1999/xhtml” >
<head runat=”server”>
<title>抓取网页所有链接</title>
</head>
<body >
<form id=”form1″ runat=”server”>
<div>
<asp:TextBox ID=”TextBox1″ runat=”server” Width=”481px”></asp:TextBox>
<asp:Button ID=”Button1″ runat=”server” onClick=”Button1_Click” Text=”提取” />
<br />
<asp:TextBox ID=”TextBox2″ runat=”server” Height=”304px” TextMode=”MultiLine” Width=”524px”></asp:TextBox></div>
</form>
</body>
</html>
来源：http://blog.csdn.net/21aspnet/
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