Wednesday, January 30, 2013

Parse XML file with Linq, part 4: Filtering

Let's read plugin information from the following XML file, selecting only plugins of "UI" type:

<Configuration xmlns="">
    <Plugin Name="Watchdog" Type="Background"/>
    <Plugin Name="UpdateChecker" Type="Background"/>
    <Plugin Name="MainForm" Type="UI"/>
    <Plugin Name="OptionsDialog" Type="UI"/>
    <Plugin Name="AboutDialog" Type="UI"/>
Plugin information is read into list of the following class:

public class Plugin
    public String Name { get; set; }
    public String Type { get; set; }
And the required code is:

namespace LinqTest
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Xml.Linq;

    static public class ParseXml
        static public List<Plugin> Example4(String fileName, String type)
            XDocument document = XDocument.Load(fileName);
            XNamespace ns = document.Root.Name.Namespace;
            List<Plugin> plugins = new List<Plugin>(from plugin in document.Descendants(ns + "Plugin")
                                                    where plugin.Attribute("Type").Value.Equals(type)
                                                    select new Plugin
                                                        Name = (String)plugin.Attribute("Name"),
                                                        Type = (String)plugin.Attribute("Type"),
            return plugins;

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