Question

It’s possible to implement INotifyCollectionChanged or other interface like IObservable to enable to bind filtered data from xml file on this file changed ? I see examples with properties or collection, but what with files changes ?

I have that code to filter and bind xml data to list box:

XmlDocument channelsDoc = new XmlDocument();
channelsDoc.Load("RssChannels.xml");
XmlNodeList channelsList = channelsDoc.GetElementsByTagName("channel");
this.RssChannelsListBox.DataContext = channelsList;

Answer 1

Try using a FileSystemWatcher

    private static void StartMonitoring()
    {
        //Watch the current directory for changes to the file RssChannels.xml
        var fileSystemWatcher = new FileSystemWatcher(@".\","RssChannels.xml");

        //What should happen when the file is changed
        fileSystemWatcher.Changed += fileSystemWatcher_Changed;

        //Start watching
        fileSystemWatcher.EnableRaisingEvents = true;
    }

    static void fileSystemWatcher_Changed(object sender, FileSystemEventArgs e)
    {
        Debug.WriteLine(e.FullPath + " changed");
    }