c# - How to separate this code in two classes? -


i want code html scraper in c# can links or other targetted strings page want to.

i began , ran straight problem: have no idea how seperate code in classes, can use different search engines.

this current code:

using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; using system.diagnostics; using system.net; using htmlagilitypack;  namespace scraper.components {     class scraper     {         public scraper()         {             webclient client = new webclient();             client.headers.add("user-agent", "mozilla/4.0 (compatible; msie 7.0; windows nt 5.1; .net clr 2.0.50727; .net clr 1.1.4322; .net clr 3.0.04506.30; .net clr 3.0.04506.648)");              htmldocument doc = new htmldocument();             doc.load(client.openread("xxx"));              htmlnode rootnode = doc.documentnode;              htmlnodecollection adnodes = rootnode.selectnodes("//a[@class='ad-title']");              foreach(htmlnode adnode in adnodes) {                 debug.writeline(                     adnode.attributes["href"].value                 );             }         }     } }

my intention seperate whole code below client.headers.add independent class, call example:

scraper scraper = new scraper(new googlese('http://google.com/...'));

or that.

thanks in advance.

just starter idea far, should work.

this beginning of the strategy pattern. may want @ factory pattern generating search engine objects.

namespace scraper.components {     class scraper     {         public scraper(isearchengine engine)         {             webclient client = new webclient();             client.headers.add("user-agent", "mozilla/4.0 (compatible; msie 7.0; windows nt 5.1; .net clr 2.0.50727; .net clr 1.1.4322; .net clr 3.0.04506.30; .net clr 3.0.04506.648)");             engine.search(client);         }      }     class googlese: isearchengine     {         public void search(webclient client){             htmldocument doc = new htmldocument();             doc.load(client.openread("http:\\google.com"));              htmlnode rootnode = doc.documentnode;              htmlnodecollection adnodes = rootnode.selectnodes("//a[@class='ad-title']");              foreach(htmlnode adnode in adnodes) {                 debug.writeline(                     adnode.attributes["href"].value                 );             }         }     class bingse: isearchengine     {         public void search(webclient client){             htmldocument doc = new htmldocument();             doc.load(client.openread("http:\\bing.com"));              htmlnode rootnode = doc.documentnode;              htmlnodecollection adnodes = rootnode.selectnodes("//a[@class='ad-title']");              foreach(htmlnode adnode in adnodes) {                 debug.writeline(                     adnode.attributes["href"].value                 );             }         }     }      interface isearchengine{         void search();     } }

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