Synnefo » Pithos MS Client

using System;

using System.Collections.Generic;

using System.Configuration;

using System.Data;

using System.Diagnostics;

using System.Linq;

using System.Net.Mail;

using System.Reflection;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

using Caliburn.Micro;

using Microsoft.Win32;

using Caliburn.Micro.Logging;

using Pithos.Client.WPF.Properties;

namespace Pithos.Client.WPF

{

    /// <summary>

    /// Interaction logic for App.xaml

    /// </summary>

    public partial class App : Application

    {

        private readonly log4net.ILog _log = log4net.LogManager.GetLogger(typeof (App));

        public App()

        {

            log4net.Config.XmlConfigurator.Configure();            

            this.DispatcherUnhandledException += OnUnhandledException;

            AppDomain.CurrentDomain.UnhandledException += OnUnhandledException;

            TaskScheduler.UnobservedTaskException += OnUnobservedException;

            InitializeComponent();            

        }

        protected override void OnStartup(StartupEventArgs e)

        {            

            if (!Settings.Default.StartOnSystemStartup && e.Args.Contains("startup"))

            {

                this.Shutdown();

            }

            base.OnStartup(e);

        }

        private void OnUnobservedException(object sender, UnobservedTaskExceptionEventArgs e)

        {            

            var messages=new List<UserMessage>();

            e.Exception.Handle(exc=>{

                messages.Add(new UserMessage

                {

                    Message = "Unexpected Exception",

                    Details = exc.ToString(),

                    Severity = Severity.Error

                });

                return true;

            });

            ShowMessages("Oops!","Where did that come from? \r\nErm, an exception occured.\r\nWe apologize for the inconvenience", messages);

            e.SetObserved();

        }

        private void OnUnhandledException(object sender, UnhandledExceptionEventArgs e)

        {

            var message = e.IsTerminating

                              ? "Unexpected Exception. The application must terminate"

                              : "Unexpected Exception";

            var messages = new[]{

                                   new UserMessage

                                       {

                                           Message = (e.ExceptionObject as Exception).Message,

                                           Details = e.ExceptionObject.ToString(),

                                           Severity = Severity.Error

                                       }

                               };

            ShowMessages("Oops!", message,messages);

        }

        void OnUnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e)

        {                        

            var messages = new[]{

                                   new UserMessage

                                       {

                                           Message = e.Exception.Message, 

                                           Details = e.Exception.ToString(),

                                           Severity = Severity.Error

                                       }

                               };

            ShowMessages("Oops!", "Unexcpected Exception", messages);

            e.Handled=true;

        }

        void ShowMessages(string title,string message,IEnumerable<UserMessage> messages )

        {

            LogMessages(messages);

            Execute.OnUIThread(()=>{

                var messageView = new MessageView(messages);

                messageView.Title = title;

                messageView.Message = message;

                messageView.ShowDialog();

            });

        }

        private void LogMessages(IEnumerable<UserMessage> messages)

        {

            var logMessage = CreateMessage(messages);

            _log.Error(logMessage);

        }

        private static string CreateMessage(IEnumerable<UserMessage> messages)

        {

            var messageBuilder = messages.Aggregate(new StringBuilder("Unexpected Error\r\n"),

                                                    (builder, message) =>

                                                        {

                                                            builder.AppendFormat("\r\n[{0}] {1}\r\n{2}\r\n", message.Severity,

                                                                                 message.Message, message.Details);

                                                            return builder;

                                                        });

            var logMessage = messageBuilder.ToString();

            return logMessage;

        }

    }

}