ASP. NET MVC-processing HTML data

Htmlagilitypack

You can use Htmlagilitypack to get page elements by looking up an HTML node in an object-oriented manner. Reference: Http://html-agility-pack.net

HTMLDocument class

//Method
Loadhtml (stringcontent);
//Loading HTML Data

CreateNode (stringhtml
//Create a Htmlnode

CreateAttribute (stringAttriname,stringAttrival)
//Create a property

createTextNode (stringText
//Create Text

//Other references: Http://html-agility-pack.net/utilities and Http://html-agility-pack.net/writer

//Properties
Documentnode
//Get root node, return a Htmlnode

Htmlnode class//Method
SelectNodes (stringXPath)
//Gets the XPath specified node collection

selectSingleNode (stringXPath)
//Gets the first node in the collection of XPath specified nodes

Setattributevalue (HtmlattributeAttri|stringAttriname,stringAttrival)
//Modify the properties of the current node

PrependChild (HtmlnodeNode
//Insert a new child node at the beginning of the current node

AppendChild (HtmlnodeNode
//Inserts a new child node at the end of the current node

Prependchildren (HtmlnodeNode
//Insert a descendant node at the beginning of the child node at the beginning of the current node

Appendchildren (HtmlnodeNode
inserts a descendant node at the end of a child node at the end of the current node

InsertAfter (HtmlnodeNode
//Insert a new node after the current node, similar to InsertBefore

Remove ()
//Remove itself

RemoveAll ()
//Remove all nodes that are contained by themselves

Removeallchildren ()
//Remove all nodes that are contained by themselves

RemoveChild (HtmlnodeOldchild|HtmlnodeOldchild,BOOLKeepgrandchildren)
//keepgrandchildren: Whether to deeply remove descendant nodes
//Remove the node specified by the parameter that itself contains

ReplaceChild (HtmlnodeNewChild,HtmlnodeOldchild);
//In the current node, replace Oldchild with Newchild

Clone ()
//Create a copy

CloneNode (BOOLDeep|stringName|stringNameBOOLDeep
//deep: Whether deep cloning, if false, only the node itself is cloned
//name: Clone the tag name of the node at the same time, such as cloning H1 content at the same time to get rid of the result node name is H2

CopyFrom (HtmlnodeNode|HtmlnodeNodeBOOLDeep
//deep: Whether the deep copy, if False, copies only the node itself
//Copy all the nodes it contains from the node specified by the parameter

Element ()
gets a child node in the current node based on the name specified by the parameter, returning a single htmlnode

Elements ()
gets a collection of child nodes in the current node based on the name specified by the parameter, returning the Ienumerable

Ancestors (stringName
gets the ancestor node of the name specified by the parameter of the current node, and gets the collection of all ancestor nodes of the current node if the argument is empty, similar to Ancestorsandself (), Ancestorsandself (string name)

Descendants (stringName
gets the descendant node of the name specified by the parameter of the current node, and gets the collection of all descendant nodes of the current node if the argument is empty, similar to Descendantsandself (), Descendantsandself (string name)

Descendantnodes ()
//Get all descendant nodes, similar to Descendantnodesandself ()

//Properties
InnerHtml
//Set or get the element node that the current node contains

InnerText
//Set or get the text that the current node contains

outerHTML
//Get all the code that the current node contains

ParentNode
//Gets the parent node of the current node

ChildNodes
//Get all child nodes, similar to FirstChild, LastChild, NextSibling, ParentNode

Htmlattribute class

//Method
ADD (HtmlattributeAttri|stringAttriname,stringAttrival)
//Add an attribute, similar to append ()

Remove (stringAttriname)
//This method requires a property collection call, removes the attribute specified by the parameter from the node, and removes all properties if the argument is empty, similar to RemoveAll (), RemoveAt (int index)

Example:

PrivatevoidTest ()
{
HTMLDocumentDoc=NewHTMLDocument();
//Three ways to create HTML objects

//The first type:
//system.io.streamreader reader = System.IO.File.OpenText (URL);
//doc. Load (reader);

//second type:
//doc. loadhtml (URL); If you use the load (URL), the prompt document contains illegal characters

//Third type:
//string htmltext = "<div>xxx</div>";
//doc. Loadhtml (htmltext);

stringUrl="Http://www.weather.com.cn/weathern/101040100.shtml";
WebClientWc=NewWebClient();
Wc.Encoding=Encoding.GetEncoding ("Utf-8");
stringContent=Wc.downloadstring (URL);

Doc.loadhtml (content);
HtmlnodeRoot=Doc.Documentnode;//Get root node
varDiv=Root.SelectNodes ("//div").Where (d=D.InnerText.Contains ("Sam")).Singleordefault ();
}

ASP. NET MVC-processing HTML data