Silverlight uses IsolatedStorage to create a new XML file and query XML with LINQ

code highlighting produced by Actipro Codehighlighter (freeware) http://www.CodeHighlighter.com/-->using System;usingSystem.Linq;usingSystem.Windows.Shapes;usingSystem.Collections.Generic;usingSystem.Collections.ObjectModel;usingSystem.IO.IsolatedStorage;usingSystem.IO;usingSystem.Xml.Linq;usingSystem.Xml;namespaceservicefacade{ Public classFresourcecategorycode {ReadOnly stringstrFileName ="Resourcecategorycode.xml"; List<FResourceCategoryCodeModel> Lfrccs =NewList<fresourcecategorycodemodel>();/// <summary>///generate an XML cache file/// </summary> Public voidCreateFile (list<fresourcecategorycodemodel>lfrccm) {Try{using(IsolatedStorageFile Isostore =isolatedstoragefile.getuserstoreforapplication ()) {using(IsolatedStorageFileStream Isostream =NewIsolatedStorageFileStream (Strfilename,filemode.create, Isostore)) {//Store one message per userXmlWriterSettings settings =Newxmlwritersettings (); settings. Indent=true;//create a XmlWriter.using(XmlWriter writer =xmlwriter.create (Isostream, Settings)) {//set the root of the XMLWriter. WriteStartElement ("Resourcecategorys");foreach(varVinchlfrccm) {//set the root of each elementWriter. WriteStartElement ("resourcecategory");//here are the settings for each element and valueWriter. WriteStartElement ("Cnccategroystandard"); writer. WriteString (V.cnccategroystandard); writer. WriteEndElement (); writer. WriteStartElement ("Cnvccategorycode"); writer. WriteString (V.cnvccategorycode); writer. WriteEndElement (); writer. WriteStartElement ("Cnvccategoryname"); writer. WriteString (V.cnvccategoryname); writer. WriteEndElement (); writer. WriteStartElement ("Cnilevel"); writer. WriteString (Convert.ToString (V.cnilevel)); writer. WriteEndElement (); writer. WriteStartElement ("Cnvcparentcode"); writer. WriteString (V.cnvcparentcode); writer. WriteEndElement (); writer. WriteStartElement ("Cniorderid"); writer. WriteString (Convert.ToString (V.cniorderid)); writer. WriteEndElement ();//XML end Tagwriter. WriteEndElement ();}//XML root end tagwriter. WriteEndElement (); writer. Flush (); }}}}Catch{;}}/// <summary>        ///reading cache files/// </summary>        Private voidReadXml () {using(IsolatedStorageFile store =isolatedstoragefile.getuserstoreforapplication ()) {                //read the file and convert the file to StreamReaderStreamReader reader =NewStreamReader (store.                OpenFile (strFileName, FileMode.Open, FileAccess.Read)); //Convert a string to XMLXDocument xmlstory =Xdocument.parse (reader.                ReadToEnd ()); //converting to a collection with LINQ to XML               varVardetails = fromDetailsinchXmlstory.descendants ("resourcecategory")//only information that is node resourcecategory is obtained.                                 Select NewFresourcecategorycodemodel {Cnccategroystandard = (string) details. Element ("Cnccategroystandard"), Cnvccategorycode= (string) details. Element ("Cnvccategorycode"), Cnvccategoryname= (string) details. Element ("Cnvccategoryname"), Cnilevel= (int) details. Element ("Cnilevel"), Cniorderid= (int) details. Element ("Cniorderid"), Cnvcparentcode= (string) details. Element ("Cnvcparentcode")                                 }; Lfrccs= vardetails.tolist<fresourcecategorycodemodel>(); Store.            Dispose (); }        }/// <summary>        ///entity class/// </summary>   Public classFresourcecategorycodemodel {Private int_cnicategroyid; /// <summary>        ///Serial Number/// </summary>         Public intCnicategroyid {Get{return_cnicategroyid;} Set{_cnicategroyid =value;} }        Private string_cnccategroystandard; /// <summary>        ///Standard Classification code/// </summary>         Public stringCnccategroystandard {Get{return_cnccategroystandard;} Set{_cnccategroystandard =value;} }        Private string_cnvccategorycode; /// <summary>        ///Resource classification and coding/// </summary>         Public stringCnvccategorycode {Get{return_cnvccategorycode;} Set{_cnvccategorycode =value;} }        Private string_cnvccategoryname; /// <summary>        ///Resource Category name/// </summary>         Public stringCnvccategoryname {Get{return_cnvccategoryname;} Set{_cnvccategoryname =value;} }        Private int_cnilevel; /// <summary>        ///Resource Classification Hierarchy/// </summary>         Public intCnilevel {Get{return_cnilevel;} Set{_cnilevel =value;} }        Private string_cnvcparentcode; /// <summary>        ///Resource Classification Parent Code/// </summary>         Public stringCnvcparentcode {Get{return_cnvcparentcode;} Set{_cnvcparentcode =value;} }        Private int_cniorderid; /// <summary>        ///Sort ID/// </summary>         Public intCniorderid {Get{return_cniorderid;} Set{_cniorderid =value;} }        Private string_cnvcremark; /// <summary>        ///Description Text/// </summary>         Public stringCnvcremark {Get{return_cnvcremark;} Set{_cnvcremark =value;} }}}}

Then by calling the method CreateFile and ReadXml can be implemented, the file storage address is the independent space of SL, the storage address under the XP system is C:\Documents and Settings\ user name \local Settings\ Application Data\microsoft\silverlight directory, you can find many cache files

Article turned from: http://www.cnblogs.com/888h/archive/2010/10/20/1856407.html