added config verification at startup

Src/LibraryCommander/App.xaml.cs

@@ -4,11 +4,14 @@
 using System.Collections.ObjectModel;
 using System.Configuration;
 using System.Data;
+using System.Data.SQLite;
 using System.Globalization;
 using System.IO;
 using System.Linq;
 using System.Threading;
+using System.Threading.Tasks;
 using System.Windows;
+using System.Windows.Threading;
 using BusinessLogic;
 using BusinessLogic.Fs;
 using DataAccess;
@@ -32,8 +35,55 @@ public partial class App : Application
 
         private void App_OnStartup(object sender, StartupEventArgs e)
         {
+            DispatcherUnhandledException += LogUnhandledDispatcherException;
+            AppDomain.CurrentDomain.UnhandledException += LogUnhandledDomainException;
+            TaskScheduler.UnobservedTaskException += LogTaskSchedulerUnobservedTaskException;
+
+            LocalizationProvider.CurrentCulture = Thread.CurrentThread.CurrentUICulture;
+            BusinessLogic.Localization.Instance = new LocalizationModel();
+            Injector.Localization = new LocalizationVm();
+
+            // Db verification
+            AppSettings settings;
+            try
+            {
+                // trying to get app setting from db
+                settings = new EntityRepository<AppSettings>().Query().FirstOrDefault();
+            }
+            catch (Exception ex)
+            {
+                var m = new MessageVm { Text = Injector.Localization.DbConnectionError };
+
+                // cannot get data from SQLite db
+                if (ex is SQLiteException || ex.InnerException is SQLiteException)
+                    m.Text += Environment.NewLine + Injector.Localization.SQLiteError;
+
+                ShowMessage(m);
+                Application.Current.Shutdown();
+                return;
+            }
+
+            // restore last localization from settings
+            if (settings != null && String.IsNullOrWhiteSpace(settings.Culture) == false)
+                LocalizationProvider.CurrentCulture = new CultureInfo(settings.Culture);
+
             string library = ConfigurationManager.AppSettings["library"];
 
+            // Storage verification
+            if (false == Directory.Exists(library))
+            {
+                var m = new MessageVm
+                        {
+                            Text = Injector.Localization.FolderNotFound + Environment.NewLine +
+                                   library + Environment.NewLine +
+                                   Injector.Localization.StorageError
+                        };
+
+                ShowMessage(m);
+                Application.Current.Shutdown();
+                return;
+            }
+
             var args = Environment.GetCommandLineArgs();
             Resources.MergedDictionaries.Clear();
             // apply a skin
@@ -65,23 +115,13 @@ private void App_OnStartup(object sender, StartupEventArgs e)
             c.Register(() => new FileFormatManager { Repository = new FileFormatRepository() }); 
             c.Register(() => new BookManager { Repository = new BookRepository() });
 
-            c.Register(() => new SearchNavigator(library) { Repository = new BookRepository() });             
+            c.Register(() => new SearchNavigator(library) { Repository = new BookRepository() });
             c.Register(() => new VirtualFsNavigator(library)
                              {
                                  BookRepository = new BookRepository(),
                                  CategoryRepository = new CategoryRepository()
                              });
             Injector.Container = c;
-
-            var settings = new EntityRepository<AppSettings>().Query().FirstOrDefault();
-
-            // configurate localization
-            if (settings != null && String.IsNullOrWhiteSpace(settings.Culture) == false)
-                LocalizationProvider.CurrentCulture = new CultureInfo(settings.Culture);
-            else
-                LocalizationProvider.CurrentCulture = Thread.CurrentThread.CurrentUICulture;
-            BusinessLogic.Localization.Instance = new LocalizationModel();
-            Injector.Localization = new LocalizationVm();            
 
             StorageManager.StoragePath = library;
             UsageValidator.Repository = new BookRepository();
@@ -107,6 +147,10 @@ private void App_OnStartup(object sender, StartupEventArgs e)
 
         private void App_OnExit(object sender, ExitEventArgs e)
         {
+            // app initialization was not completed. quit without changing settings
+            if (_commander == null)
+                return;
+
             // save app setting on Exit
             var rep = new EntityRepository<AppSettings>();
             var settings = rep.Query().FirstOrDefault() ?? new AppSettings();
@@ -124,5 +168,58 @@ private void App_OnExit(object sender, ExitEventArgs e)
 
             rep.SaveOrUpdate(settings);
         }
+
+        private void ShowMessage(MessageVm m)
+        {
+            new WpfMessageBox().ShowDialog(m);
+        }
+
+        private void ShowExceptionMessage(Exception ex, string source)
+        {
+            var m = new MessageVm
+                    {
+                        Text = ex.Message + Environment.NewLine + Injector.Localization.LogRequest,
+                        Yes = true,
+                        No = true,
+                    };
+
+            // request to create log file
+            new WpfMessageBox().ShowDialog(m);
+
+            if (m.DialogResult.ToString() != "Yes")
+                return;
+
+            try
+            {
+                File.WriteAllLines("Log " + DateTime.Now.ToString("dd-mm-yy hh-MM-ss") + ".txt",
+                    new[]
+                    {
+                        source,
+                        ex.GetType().FullName,
+                        ex.Message,
+                        ex.StackTrace
+                    });
+            }
+            catch
+            {
+                // log write failed
+            }
+        }
+
+        private void LogTaskSchedulerUnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs arg)
+        {
+            ShowExceptionMessage(arg.Exception, "TaskScheduler.UnobservedTaskException");
+        }
+
+        private void LogUnhandledDomainException(object sender, UnhandledExceptionEventArgs arg)
+        {
+            ShowExceptionMessage(arg.ExceptionObject as Exception, "AppDomain.CurrentDomain.UnhandledException: " + String.Format("IsTerminating = {0}", arg.IsTerminating));
+        }
+
+        private void LogUnhandledDispatcherException(object sender, DispatcherUnhandledExceptionEventArgs arg)
+        {
+            ShowExceptionMessage(arg.Exception, "DispatcherUnhandledException");
+            arg.Handled = true;
+        }
     }
 }

Src/LibraryCommander/Localization/LocalizationVm.cs

@@ -40,5 +40,10 @@ public class LocalizationVm: LocalizationProvider, ILocalizationVm
 
         public string FileNotFound { get { return GetResource(); } }
         public string FolderNotFound { get { return GetResource(); } }
+
+        public string DbConnectionError { get { return GetResource(); } }
+        public string SQLiteError { get { return GetResource(); } }
+        public string StorageError { get { return GetResource(); } }
+        public string LogRequest { get { return GetResource(); } }
     }
 }

Src/LibraryCommander/MainWindow.xaml

@@ -200,15 +200,8 @@
                                     <!--<Setter Property="Background" Value="Transparent"/>-->
                                     <!--<Setter Property="IsHitTestVisible" Value="False"/>-->
                                     <Setter Property="local:Attached.IsFocused" Value="{Binding Path=IsSelected, RelativeSource={RelativeSource Self}, Mode=OneWay}"/>
-                                    <Setter Property="BorderThickness" Value="0"/>                                        
-                                    <Setter Property="FocusVisualStyle" Value="{x:Null}"/>                                        
-                                    <Style.Triggers>
-                                        <Trigger Property="IsSelected" Value="True">
-                                            <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
-                                            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
-                                            <Setter Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
-                                        </Trigger>
-                                    </Style.Triggers>
+                                    <Setter Property="BorderThickness" Value="0"/>
+                                    <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
                                 </Style>
                             </DataGrid.CellStyle>
 

Src/LibraryCommander/Properties/AssemblyInfo.cs

@@ -51,5 +51,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.0.0.0")]
-[assembly: AssemblyFileVersion("1.0.0.0")]
+[assembly: AssemblyVersion("1.0.1.0")]
+[assembly: AssemblyFileVersion("1.0.1.0")]

Src/LibraryCommander/Properties/Resources.resx

@@ -247,4 +247,16 @@
   <data name="LanguageUsageWarning" xml:space="preserve">
     <value>Library contains book(s) in language [{0}]</value>
   </data>
+  <data name="DbConnectionError" xml:space="preserve">
+    <value>Cannot connect to database.</value>
+  </data>
+  <data name="LogRequest" xml:space="preserve">
+    <value>Create log file?</value>
+  </data>
+  <data name="SQLiteError" xml:space="preserve">
+    <value>If app was launched with default settings, file Books.db is possibly missing.</value>
+  </data>
+  <data name="StorageError" xml:space="preserve">
+    <value>Change "library" value in application .CONFIG file (should be full path of an existing folder)</value>
+  </data>
 </root>

Src/LibraryCommander/Properties/Resources.ru-Ru.resx

@@ -313,4 +313,16 @@
   <data name="LanguageUsageWarning" xml:space="preserve">
     <value>В библиотеке есть книги на языке [{0}]</value>
   </data>
+  <data name="DbConnectionError" xml:space="preserve">
+    <value>Не удалось подключиться к базе данных.</value>
+  </data>
+  <data name="LogRequest" xml:space="preserve">
+    <value>Создать файл с информацией об ошибке?</value>
+  </data>
+  <data name="SQLiteError" xml:space="preserve">
+    <value>Возможно отсутствует файл Books.db, если приложение было запущено с настройками по умолчанию.</value>
+  </data>
+  <data name="StorageError" xml:space="preserve">
+    <value>Заполните значение поля "library" в конфигурационном файле приложения (расширение .CONFIG). Укажите полный путь к существующему каталогу, который будет использоваться для хранения документов.</value>
+  </data>
 </root>

Src/ViewModels/ILocalizationVm.cs

@@ -32,5 +32,10 @@ public interface ILocalizationVm
         string Library { get; }
         string FileNotFound { get; }
         string FolderNotFound { get; }
+
+        string DbConnectionError { get; }
+        string SQLiteError { get; }
+        string StorageError { get; }
+        string LogRequest { get; }
     }
 }