McrNews.xaml.cs

Go to the documentation of this file.

using System;
using System.Windows;
using System.Windows.Controls;
using System.ComponentModel;
using System.Net;
using System.IO;

namespace SeciControls
{
    public partial class McrNews : UserControl
    {
        String _url = "http://dataweb.isis.rl.ac.uk/mcr/mcrnews.txt";
        BackgroundWorker _worker = new BackgroundWorker();
        System.Timers.Timer _timer;
        int _updateRateSecs = 30;

        public McrNews()
        {
            InitializeComponent();
        }

        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            _worker.DoWork += new DoWorkEventHandler(_worker_DoWork);
            _worker.RunWorkerAsync();

            _timer = new System.Timers.Timer();
            _timer.Interval = _updateRateSecs * 1000;
            _timer.Elapsed += new System.Timers.ElapsedEventHandler(_timer_Elapsed);
            _timer.Start();
        }

        void _timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            if (!_worker.IsBusy)
            {
                _worker.RunWorkerAsync();
            }
        }

        void _worker_DoWork(object sender, DoWorkEventArgs e)
        {
            Action action = delegate()
            {
                String text = GetLatestInformation();

                if (!String.IsNullOrEmpty(text) && text != txtNews.Text)
                {
                    //Update the data
                    txtNews.Text = text;
                }
            };

            this.Dispatcher.Invoke(action);
        }

        public String GetLatestInformation()
        {
            try
            {
                if (String.IsNullOrEmpty(_url)) return "";

                String data;
                WebRequest wr = WebRequest.Create(_url);

                using (WebResponse res = wr.GetResponse())
                using (Stream s = res.GetResponseStream())
                using (StreamReader sr = new StreamReader(s))
                    data = sr.ReadToEnd();

                return data;
            }
            catch
            {
                return "";
            }
        }
    }
}