App.xaml.cs

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Windows;
using System.Windows.Media;
using System.Windows.Threading;
using Presenter.App_Code;
using Presenter.Resources;

namespace Presenter
{
    public partial class App : Application
    {
        void App_DispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
        {
            // Prevent default unhandled exception processing
            e.Handled = true;

            // Process unhandled exception
            LogError(e.Exception);
            
            MessageBox.Show(Labels.AppError + ":" + Environment.NewLine + e.Exception.GetBaseException().Message, "Presenter", MessageBoxButton.OK, MessageBoxImage.Error);

            //if main window is not open when error is thrown, close application otherwise only way to close it will be via task manager
            if (this.MainWindow == null || this.MainWindow.Visibility != Visibility.Visible)
                Environment.Exit(1);
        }

        public static void LogError(Exception ex)
        {
            ex = ex.GetBaseException();
            string stacktrace = ex.StackTrace ?? "";
            if (stacktrace.Length > 500 && stacktrace.IndexOf(" at ", 500) != -1)
                stacktrace = stacktrace.Substring(0, stacktrace.IndexOf("at", 500));

            string path = Path.GetDirectoryName(System.Windows.Forms.Application.ExecutablePath) + "\\error.log";
            using (StreamWriter log = new StreamWriter(File.Open(path, FileMode.Append)))
            {
                log.WriteLine("Date: " + DateTime.Now);
                log.WriteLine("Type: " + ex.GetType().Name);
                log.WriteLine("Error: " + ex.Message + Environment.NewLine + "StackTrace:" + Environment.NewLine + stacktrace + Environment.NewLine);
            }
        }

        protected override void OnStartup(StartupEventArgs e)
        {
            var key = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Microsoft SQL Server Compact Edition\v4.0", false);
            if (key == null) // || Util.Parse<int>(key.GetValue("ServicePackLevel")) < 2)
                throw new Exception(Labels.AppRequiresSql);

            key = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Office");
            bool found = false;
            if (key != null)
            {
                string[] versions = key.GetSubKeyNames().Where(v => Util.Parse<double>(v) >= 10).ToArray();
                foreach (string v in versions)
                {
                    key = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Office\" + v + @"\PowerPoint\InstallRoot", false);
                    if (key != null && !String.IsNullOrEmpty(key.GetValue("Path") as string))
                        found = true;
                }
            }

            if (!found)
            {
                key = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Wow6432Node\Microsoft\Office");
                if (key == null)
                    throw new Exception(Labels.AppRequiresOffice);
                string[] versions = key.GetSubKeyNames().Where(v => Util.Parse<double>(v) >= 10).ToArray();
                foreach (string v in versions)
                {
                    key = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Wow6432Node\Microsoft\Office\" + v + @"\PowerPoint\InstallRoot", false);
                    if (key != null && !String.IsNullOrEmpty(key.GetValue("Path") as string))
                        found = true;
                }
            }

            if (!found)
                throw new Exception(Labels.AppRequiresOffice);

            Config.FontSize = Util.Parse<double?>(ConfigurationManager.AppSettings["FontSize"]) ?? SystemFonts.MessageFontSize;

            base.OnStartup(e);

            //accessing database causes 3 or 4 sec delay so place in background thread, useful preloading for when planner is opened
            new Action(() =>
            {
                //determine if it's a new installation by whether there are any schedules loaded or not
                //if Presenter 0.9.9, will be running sql compact 3.5 that will need to be upgraded to 4.0
                bool isnew = true;
                try { isnew = !Schedule.LoadSchedules().Any(); }
                catch (Exception ex)
                {
                    if (ex.GetBaseException().Message == "The database file has been created by an earlier version of SQL Server Compact. Please upgrade using SqlCeEngine.Upgrade() method.")
                    {
                        var engine = new System.Data.SqlServerCe.SqlCeEngine(ConfigurationManager.ConnectionStrings["DatabaseConnectionString"].ConnectionString);
                        engine.Upgrade();
                        engine.Compact(null);
                        isnew = !Schedule.LoadSchedules().Any();
                    }
                    else
                        throw ex;
                }

                //gives warning that videos won't work without WMP10, not a requirement so only display if a new installation
                if (isnew)
                {
                    key = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\MediaPlayer\PlayerUpgrade", false);
                    if (key == null || Util.Parse<int>((key.GetValue("PlayerVersion") ?? "").ToString().Split(',').FirstOrDefault()) < 10)
                    if (!Application.Current.Dispatcher.CheckAccess())
                        Application.Current.Dispatcher.Invoke(new Action(() => { MessageBox.Show(MainWindow, Labels.AppRequiresWMP, "", MessageBoxButton.OK, MessageBoxImage.Exclamation); }));
                }
            }).BeginInvoke(null, null);
        }
    }
}