C # language Input keywords, crawl all the URLs you want

            usingSystem;usingSystem.Collections.Generic;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Linq;usingSystem.Text;usingSystem.Windows.Forms;usingmshtml;usingSystem.Collections;usingSystem.Threading;namespacetraverse Baidu Web page { Public Delegate voidbaidu111 ();  Public Partial classForm1:form { PublicForm1 () {InitializeComponent (); }        Private voidForm1_Load (Objectsender, EventArgs e) {Listview1.gridlines=true;         } thread thread; voidBaidu () {baidu111 (); }         voidbaidu111 () {if(webbrowser1.invokerequired) {baidu111 Dr=Newbaidu111 (baidu111);  This.             Invoke (DR); }             Else             {                 stringURL ="http://www.baidu.com/s?wd="+TextBox1.Text; WebBrowser1.Navigate (URL.             Trim ()); }         }        //Click Stop         Private voidButton2_Click (Objectsender, EventArgs e) {                      }        Private voidButton1_Click (Objectsender, EventArgs e) {        //System.Diagnostics.Process.Start ("http://www.baidu.com"); //webbrowser1.navigate ("http://www.baidu.com/");Thread =NewThread (NewThreadStart (Baidu)); Thread. IsBackground=true; Thread.                     Start ();        Baidu (); }        inti =0;  Public voidBianli () {IHTMLDocument2 doc= WebBrowser1.Document.DomDocument asIHTMLDocument2; foreach(IHTMLElement eleinchdoc.all) {if(Ele.innertext = ="Next page >") {Ele.click (); I++; if(i==3)                    {                         Break; }                                   }            }        }        /// <summary>        ///To interpret whether the Web page is loading completed/// </summary>        /// <param name= "Sender" ></param>        /// <param name= "E" ></param>        Private voidWebbrowser1_documentcompleted (Objectsender, WebBrowserDocumentCompletedEventArgs e) {            if(i==3)            {                return; }            if(E.url = =webBrowser1.Document.Url) {Bianliwangye (); }        }        /// <summary>        ///enumeration gets all URLs of Baidu search page/// </summary>        /// ArrayList All=NewArrayList (); stringA1;  Public voidBianliwangye () {IHTMLDocument2 document= (IHTMLDocument2) webBrowser1.Document.DomDocument;//Get Source codeIHTMLElementCollection HC = (ihtmlelementcollection) document.all;//Get all Tags//MessageBox.Show (HC. ToString ());                      foreach(IHTMLElement HinchHc//Traverse Tags            {                if(H.classname = ="g"|| H.classname = ="C-showurl")//classname interpretation by label                {                    stringA = h.innerhtml;//get label text content                    if(A.contains (" in"))                    {                        intb = A.indexof (" in"); A1= A.substring (0, b);//Intercept URLsMessageBox.Show (A1); All.                    ADD (A1); }}} Bianli ();//when enumerating to the last URL of the current page, simulate click to go to the next page                 }        Private voidButton3_Click (Objectsender, EventArgs e) {LISTVIEW1.COLUMNS.ADD ("numbering"); LISTVIEW1.COLUMNS.ADD ("get to the URL", -);  for(inti =0; I < All. Count; i++) {ListView1.Items.Add ((i+1).                ToString ()); Listview1.items[i]. SubItems.Add (All[i].            ToString ()); }        }                }}

C # language Input keywords, crawl all the URLs you want