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POC# Web Crawler/Parser/Spider
 

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    <p>I'm new in a C# and WinForms I want to create a web crawler (parser) - which can parse a web pages and showing them hierarchically. + I don't know how to make bot crawling with a specific hyper-link depth.</p> <p>So I think I have 2 questions: </p> <ol> <li>How to make bot crawling with specified link depth?</li> <li>How to show all hyperlinks hierarchically?</li> </ol> <p>P.S. I would be great if it'll be a code samples.</p> <p>P.P.S. have 1 button = button1; and 1 richtextbox = richTextBox1;</p> <p>Here is my code: I know it's very ugly.... (all code in a one button):</p> <pre><code>public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { //Declaration HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url); HttpWebResponse response = (HttpWebResponse) request.GetResponse(); StreamReader sr = new StreamReader(response.GetResponseStream()); Match m; string anotherTest = @"(((ht){1}tp[s]?://)[-a-zA-Z0-9@:%_\+.~#?&amp;\\]+)"; List&lt;string&gt; savedUrls = new List&lt;string&gt;(); List&lt;string&gt; titles = new List&lt;string&gt;(); //Go to this URL: string url = UrlTextBox.Text = "http://www.yahoo.com"; if (!(url.StartsWith("http://") || url.StartsWith("https://"))) url = "http://" + url; //Scrape Whole Html code: string s = sr.ReadToEnd(); try { // Get Urls: m = Regex.Match(s, anotherTest, RegexOptions.IgnoreCase | RegexOptions.Compiled, TimeSpan.FromSeconds(1)); while (m.Success) { savedUrls.Add(m.Groups[1].ToString()); m = m.NextMatch(); } // Get TITLES: Match m2 = Regex.Match(s, @"&lt;title&gt;\s*(.+?)\s*&lt;/title&gt;"); if (m2.Success) { titles.Add(m2.Groups[1].Value); } //Show Title: richTextBox1.Text += titles[0] + "\n"; //Show Urls: TrimUrls(ref savedUrls); } catch (RegexMatchTimeoutException) { Console.WriteLine("The matching operation timed out."); } sr.Close(); } private void TrimUrls(ref List&lt;string&gt; urls) { List&lt;string&gt; d = urls.Distinct().ToList(); foreach (var v in d) { if (v.IndexOf('.') != -1 &amp;&amp; v != "http://www.w3.org") { richTextBox1.Text += v + "\n"; } } } } </code></pre> <p>}</p> <p>And one more question: Is Anybody know how to save it in XML like a tree?</p>
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    1. USJake
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    1. COSimply said `HTMLAgilityPack`
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    2. COPython + urllib2 + BeautifulSoup
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    3. COis there is any chances that you can write a code: how to implement depth with HTMLAgilityPack?
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