launcher source

using System;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Windows.Forms;

namespace Launcher
{
    class Program
    {
        static void Main(string[] args)
        {
            var launcher = new Launcher();
            launcher.RunApplication();
        }

    }

    class Launcher
    {
        static string AppData { get { return Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData); } }
        const string FolderPath = "alt";

        readonly string BuildPath = $@"{AppData}\{FolderPath}\build.txt";
        readonly string AppPath = $@"{AppData}\{FolderPath}\app.exe";

        readonly string GetLatestApp = "http://IP/latest-alt.exe";
        readonly string GetLatestBuild = "http://IP/latest-build.txt";

        public void RunApplication()
        {
            if (!Directory.Exists($"{AppData}/{FolderPath}"))
                Directory.CreateDirectory($"{AppData}/{FolderPath}");

            if (UpdateAvailable())
                DownloadApplication();

            if (File.Exists(AppPath)) Process.Start(AppPath);
            else MessageBox.Show("При скачивании последней версии ALT'a возникли ошибки.\nПроверьте интернет соединение");
        }

        public bool UpdateAvailable()
        {
            if (!File.Exists(BuildPath) || !File.Exists(AppPath))
                return true;

            try {
                var serverBuild = new WebClient().DownloadString(GetLatestBuild);
                var localBuild = File.ReadAllText(BuildPath);

                return serverBuild != localBuild;
            } catch { return false; }
        }

        public void DownloadApplication()
        {
            try {
                var client = new WebClient();

                //File.Delete(AppPath);
                //File.Delete(BuildPath);

                client.DownloadFile(GetLatestApp, AppPath);
                client.DownloadFile(GetLatestBuild, BuildPath);
            } catch { }
        }
    }
}