Net Processing HTML page element tool class (htmlagilitypack. dll)

Introduction

This article introduces the tool class (htmlagilitypack) for net to process HTML page elements. DLL), the use of a lot of purposes should be such as collection functions, how to deal with the collected HTML string is a headache, it is too troublesome and error-prone to intercept. All the third-party DLL files in this article are used for processing.

 

Download

: Http://htmlagilitypack.codeplex.com/

Click "Download" to download the file.

 

Use

1. Add htmlagilitypack. dll reference (reference class using htmlagilitypack ;).

2. Obtain the value based on the input ID in HTML.CodeAs follows:

 //  Simulate user requests WebClient = New  WebClient (); WebClient. Encoding = System. Text. encoding. utf8;  String Htmlcontext = WebClient. downloadstring ( "  Http: // stone_w.cnblogs.com/  "  ); WebClient. Credentials = Credentialcache. defaultcredentials; //  Add authorization certificate WebClient. headers. Add ( "  User-Agent " , "  Microsoft Internet Explorer  "  ); WebClient. headers. Add (  "  Host  " , "  Www.cnblogs.com  "  );  //  Obtain HTML elements (htmlcontext is an HTML page string) Htmldocument htmldoc = New Htmldocument (); htmldoc. loadhtml (htmlcontext );  //  Load HTML pages Htmlnode navnode = htmldoc. getelementbyid ( "  ID  "  ); Response. Write (navnode. attributes [  "  Value  " ]. Value );

 

Summary

Htmlagilitypack can query value by ID and obtain a single element node, which is a built-in method of the htmldocument class. You can try to practiceExercise. Thank you ~