Привязать список к таблице базы данных

Question

Я поддерживаю приложение WPF. Я создал базу данных с использованием Entity Framework Code First, и теперь я хотел бы использовать мою базу данных с моим графическим интерфейсом. У меня есть ListBox в xaml

XAML

<Window.Resources> 
     <DataTemplate x:Key="lstDishesTemplate"> 
      <StackPanel> 
       <StackPanel Orientation="Horizontal"> 
        <TextBlock Text="{Binding Path = Dishes.Description}" FontWeight="Bold"/> 
       </StackPanel> 
      </StackPanel> 
     </DataTemplate> 
    </Window.Resources> 
<ListBox x:Name="lstDishes" Height="415" VerticalAlignment="Bottom" Margin="0,0,1032,42" HorizontalAlignment="Right" Width="281" ItemTemplate="{StaticResource lstDishesTemplate}" Background="#FFDDC9B0" BorderBrush="{x:Null}"/> 

И тогда я пытаюсь запросить мои данные в таблицу, как это:

XAML.cs

private void Window_Loaded(object sender, RoutedEventArgs e) 
{ 
    public PizzeriaDBContext db = new PizzeriaDBContext(); 

    var dish = db.Dishes.ToList(); 
    lstDishes.ItemsSource = dish; 
} 

Я получаю исключение:

An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in EntityFramework.SqlServer.dll

Additional information: Exception generated by destination of a call (translated).

Update:

System.Reflection.TargetInvocationException was unhandled 
    HResult=-2146232828 
    Message=Eccezione generata dalla destinazione di una chiamata. 
    Source=mscorlib 
    StackTrace: 
     in System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) 
     in System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) 
     in System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) 
     in System.Data.Entity.Core.Common.Internal.Materialization.Translator.TranslateColumnMap(Translator translator, Type elementType, ColumnMap columnMap, MetadataWorkspace workspace, SpanIndex spanIndex, MergeOption mergeOption, Boolean streaming, Boolean valueLayer) 
     in System.Data.Entity.Core.Objects.Internal.ObjectQueryExecutionPlanFactory.Prepare(ObjectContext context, DbQueryCommandTree tree, Type elementType, MergeOption mergeOption, Boolean streaming, Span span, IEnumerable`1 compiledQueryParameters, AliasGenerator aliasGenerator) 
     in System.Data.Entity.Core.Objects.ELinq.ELinqQueryState.GetExecutionPlan(Nullable`1 forMergeOption) 
     in System.Data.Entity.Core.Objects.ObjectQuery`1.<>c__DisplayClass7.<GetResults>b__6() 
     in System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction[T](Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess) 
     in System.Data.Entity.Core.Objects.ObjectQuery`1.<>c__DisplayClass7.<GetResults>b__5() 
     in System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation) 
     in System.Data.Entity.Core.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption) 
     in System.Data.Entity.Core.Objects.ObjectQuery`1.<System.Collections.Generic.IEnumerable<T>.GetEnumerator>b__0() 
     in System.Data.Entity.Internal.LazyEnumerator`1.MoveNext() 
     in System.Collections.ObjectModel.ObservableCollection`1.CopyFrom(IEnumerable`1 collection) 
     in System.Collections.ObjectModel.ObservableCollection`1..ctor(IEnumerable`1 collection) 
     in Cw2.ServerWin.Window_Loaded(Object sender, RoutedEventArgs e) in C:\Users\Fennec\Documents\assessment2\Cw2\Server.xaml.cs:riga 56 
     in System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs) 
     in System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) 
     in System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args) 
     in System.Windows.UIElement.RaiseEvent(RoutedEventArgs e) 
     in System.Windows.BroadcastEventHelper.BroadcastEvent(DependencyObject root, RoutedEvent routedEvent) 
     in System.Windows.BroadcastEventHelper.BroadcastLoadedEvent(Object root) 
     in MS.Internal.LoadedOrUnloadedOperation.DoWork() 
     in System.Windows.Media.MediaContext.FireLoadedPendingCallbacks() 
     in System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks() 
     in System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget) 
     in System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget) 
     in System.Windows.Media.MediaContext.Resize(ICompositionTarget resizedCompositionTarget) 
     in System.Windows.Interop.HwndTarget.OnResize() 
     in System.Windows.Interop.HwndTarget.HandleMessage(WindowMessage msg, IntPtr wparam, IntPtr lparam) 
     in System.Windows.Interop.HwndSource.HwndTargetFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) 
     in MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) 
     in MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) 
     in System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) 
     in System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler) 
     in System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) 
     in MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) 
    InnerException: 
     HResult=-2146233079 
     Message=The class 'Cw2.Dish' has no parameterless constructor. 
     Source=EntityFramework 
     StackTrace: 
      in System.Data.Entity.Core.Objects.DelegateFactory.GetConstructorForType(Type type) 
      in System.Data.Entity.Core.Common.Internal.Materialization.Translator.TranslatorVisitor.Emit_ConstructEntity(EntityType oSpaceType, IEnumerable`1 propertyBindings, Expression entityKeyReader, Expression entitySetReader, TranslatorArg arg, EntityProxyTypeInfo proxyTypeInfo) 
      in System.Data.Entity.Core.Common.Internal.Materialization.Translator.TranslatorVisitor.Visit(EntityColumnMap columnMap, TranslatorArg arg) 
      in System.Data.Entity.Core.Query.InternalTrees.EntityColumnMap.Accept[TResultType,TArgType](ColumnMapVisitorWithResults`2 visitor, TArgType arg) 
      in System.Data.Entity.Core.Common.Internal.Materialization.Translator.TranslatorVisitor.ProcessCollectionColumnMap(CollectionColumnMap columnMap, TranslatorArg arg, ColumnMap discriminatorColumnMap, Object discriminatorValue) 
      in System.Data.Entity.Core.Common.Internal.Materialization.Translator.TranslatorVisitor.Visit(SimpleCollectionColumnMap columnMap, TranslatorArg arg) 
      in System.Data.Entity.Core.Query.InternalTrees.SimpleCollectionColumnMap.Accept[TResultType,TArgType](ColumnMapVisitorWithResults`2 visitor, TArgType arg) 
      in System.Data.Entity.Core.Common.Internal.Materialization.Translator.TranslateColumnMap[T](ColumnMap columnMap, MetadataWorkspace workspace, SpanIndex spanIndex, MergeOption mergeOption, Boolean streaming, Boolean valueLayer) 
     InnerException: 

ОТВЕТ

Анализ полного исключения, кажется, что классы конструкторы не должны иметь параметры.

Answer 1

В первый:

Внутреннее исключение говорит ваша ошибка:

Message=The class 'Cw2.Dish' has no parameterless constructor.
Source=EntityFramework

Так что вам нужно, чтобы исправить свой конструктор. Если вы показываете свои классы, вы можете исправить свою ошибку.

Второй шаг для редактирования:

Вы должны исправить обязательный путь в вашей собственности DataTemplate из Text:

<TextBlock Text="{Binding Path = Description}" FontWeight="Bold"/> 

Причина нет такого свойства Dishes.Description в вашем Dish классе.