LINQ FOR XML Simple example

LINQ, language-integrated queries (Language Integrated query) is a set of extensions for the C # and Visual Basic languages. It allows developers to manipulate memory data in the same way as querying a database. Technically, LINQ defines about 40 query operators, such as Select, from, in, where, and order by (C #). Use these operators to write query statements. However, these queries can also be based on many types of data, and each data type requires a separate LINQ type.

This article provides a brief introduction to the basic operation of XML using LINQ technology, which consists of two classes: Xmlelementinfor and Xmlhelper, and the code is implemented as follows:

     Public classXmlhelper {Private string_filepath;  PublicXmlhelper (stringFilePath) {_filepath=FilePath; }        /// <summary>        ///Creating an XML file/// </summary>         Public voidcreatedocument () {XDocument Xdoc=NewXDocument (NewXdeclaration ("1.0","Utf-8","Yes"),                NewXElement ("Root")); Xdoc.        Save (_filepath); }        /// <summary>        ///adding elements to XML and nodes/// </summary>        /// <param name= "NodeName" >element name</param>        /// <param name= "xelements" >element properties and content</param>         Public voidAddxmlnodetoroot (stringNodeName,params Object[] xelements) {XElement RootNode=xelement.load (_filepath); XElement NewNode=NewXElement (NodeName, xelements);            Rootnode.add (NewNode);        Rootnode.save (_filepath); }        /// <summary>        ///deleting elements and their child elements from XML and nodes/// </summary>        /// <param name= "NodeName" >element name</param>        /// <param name= "Idelement" >element Filter Criteria</param>         Public voidDeletenodefromroot (stringNodeName, Xmlelementinfor idelement) {XElement RootNode=xelement.load (_filepath); IEnumerable<XElement> targetnodes = fromTargetinchrootnode.descendants (nodeName)whereTarget. Element (Idelement.name). Value.equals (Idelement.value)SelectTarget;            Targetnodes.remove ();        Rootnode.save (_filepath); }        /// <summary>        ///Updating elements/// </summary>        /// <param name= "NodeName" >element name</param>        /// <param name= "Idelement" >element Filter Criteria</param>        /// <param name= "Updatevalue" >need to update content</param>         Public voidUpdatenodefromroot (stringNodeName, Xmlelementinfor idelement, xmlelementinfor[] updatevalue) {XElement RootNode=xelement.load (_filepath); IEnumerable<XElement> targetnodes = fromTargetinchrootnode.descendants (nodeName)whereTarget. Element (Idelement.name). Value.equals (Idelement.value)SelectTarget; foreach(XElement nodeinchtargetnodes) {                foreach(varIteminchupdatevalue) {node. Element (item. Name). SetValue (item.                Value);        }} rootnode.save (_filepath); }        /// <summary>        ///querying elements from the root node/// </summary>        /// <param name= "NodeName" >element name</param>        /// <param name= "Idelement" >element Filter Criteria</param>        /// <returns></returns>         PublicIenumerable<xelement> Querynodefromroot (stringNodeName, Xmlelementinfor idelement) {XElement RootNode=xelement.load (_filepath); IEnumerable<XElement> targetnodes = fromTargetinchrootnode.descendants (nodeName)whereTarget. Element (Idelement.name). Value.equals (Idelement.value)SelectTarget; returnTargetnodes; }    }

Xmlhelper

     Public classXmlelementinfor {Private string_name; Private string_value;  PublicXmlelementinfor (stringElementName,stringelementvalue) {_name=elementname; _value=Elementvalue; }         Public stringName {Get{return_name;} }         Public stringValue {Get{return_value;} }    }

LINQ FOR XML Simple example