这是代码:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.Text.RegularExpressions;
using System.IO;
namespace DownloadImages
{
public partial class Form1 : Form
{
string f;
public Form1()
{
InitializeComponent();
string localFilename = @"d:\localpath\";
using (WebClient client = new WebClient())
{
client.DownloadFile("http://www.sat24.com/foreloop.aspx?type=1&continent=europa#",localFilename + "test.html");
}
f = File.ReadAllText(localFilename + "test.html");
test();
}
private void test()
{
List<string> imagesUrls = new List<string>();
int startIndex = 0;
int endIndex = 0;
int position = 0;
string startTag = "http://www.niederschlagsradar.de/images.aspx";
string endTag = "cultuur=en-GB&continent=europa";
startIndex = f.IndexOf(startTag);
while (startIndex > 0)
{
endIndex = f.IndexOf(endTag,startIndex);
if (endIndex == -1)
{
break;
}
string t = f.Substring(startIndex, endIndex - startIndex + endTag.Length);
imagesUrls.Add(t);
position = endIndex + endTag.Length;
startIndex = f.IndexOf(startTag,position);
}
}
private void Form1_Load(object sender, EventArgs e)
{
}
}
}
List中最后包含63个索引。 例如,第一个索引0包含:
http://www.niederschlagsradar.de/images.aspx?jaar=-6&type=europa.precip&datum=201309151800&cultuur=en-GB&continent=europa
例如,索引5包含:
http://www.niederschlagsradar.de/images.aspx?jaar=-6&type=europa.precip&datum=201309160600&cultuur=en-GB&continent=europa
最后一个索引是问题,它包含我想要的其他索引中的字符串,但它还包含来自最后一个索引的其余文件内容:
这是最后一个索引的一部分:
http://www.niederschlagsradar.de/images.aspx?jaar=-6&type=europa.precip&cultuur=thumbnail&continent=europa" border="0"/></a></li><li style="margin-top: -12px;text-align: center;"><a href="/?ir=true&co=true&li=false" target="_top" class="white"><div
但最后一个索引应该只是:
http://www.niederschlagsradar.de/images.aspx?jaar=-6&type=europa.precip&cultuur=thumbnail&continent=europa
我该如何解决?
答案 0 :(得分:0)
答案 1 :(得分:0)
用于抓取网页,htmlagilitypack非常有用。这是一个有用的解释示例: http://codingfields.com/guides/htmlagilitypack/
此页面也不错: http://beletsky.net/2010/09/crawling-web-sites-with-htmlagilitypack.html