CODEWITHSUNDEEP
c#wpfautofac
Joe
Joe

Reputation: 4183

Autofac not hitting constructor with parameter

Autofac's default is to use the constructor with the most parameters yet it keeps hitting the parameterless default constructor.

Consuming class:

using AlbumApp.Core.Common.Contracts;
using AlbumApp.Core.Common.UI.Core;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AlbumApp.Admin.ViewModels
{
  public class MainViewModel : ViewModelBase
  {
    private static IServiceFactory _serviceFactory;

    public MainViewModel() { }

    public MainViewModel(IServiceFactory serviceFactory)
    { _serviceFactory = serviceFactory; }

    private DashboardViewModel _dashboardViewModel = new DashboardViewModel(_serviceFactory);

    public DashboardViewModel DashboardViewModel { get { return _dashboardViewModel; } private set { } } // = new DashboardViewModel();
  }
}

AutofacLoader:

using AlbumApp.Client.Proxies;
using AlbumApp.Core.Common.Contracts;
using Autofac;
using System.Reflection;

namespace AlbumApp.Admin.Bootstrapper
{
  public static class AutoFacLoader
  {
    public static IContainer Init() { 
      var builder = Builder();
      return builder.Build(); }

    public static ContainerBuilder Builder() {
      var builder = new ContainerBuilder();
      builder.RegisterAssemblyTypes(Assembly.GetExecutingAssembly())
        .InNamespace("AlbumApp.Admin.ViewModels").SingleInstance();
      builder.RegisterType<ServiceFactory>().As<IServiceFactory>();

      return builder; }
  }
}

App.xaml.cs

using AlbumApp.Admin.Bootstrapper;
using AlbumApp.Core.Common.Core;
using System.Windows;

namespace AlbumApp.Admin
{
  /// <summary>
  /// Interaction logic for App.xaml
  /// </summary>
  public partial class App : Application
  {
    protected override void OnStartup(StartupEventArgs e)
    {
      base.OnStartup(e);

      ObjectBase.Container = AutoFacLoader.Init();

    }
  }
}

When I set a breakpoint on the builder.Build and check the ComponentRegistry it contains the ServiceFactory.

{Activator = ServiceFactory (ReflectionActivator), Services = [AlbumApp.Core.Common.Contracts.IServiceFactory], Lifetime = Autofac.Core.Lifetime.CurrentScopeLifetime, Sharing = None, Ownership = OwnedByLifetimeScope}

I also set a breakpoint on the two constructors of the MainViewModel and only the default constructor is hit so the _serviceFactory is null.

How do I get Autofac to inject a ServiceFactory?

Call Stack on parameterless constructor:

AlbumApp.Admin.exe!AlbumApp.Admin.ViewModels.MainViewModel.MainViewModel() Line 15 C# AlbumApp.Admin.exe!AlbumApp.Admin.MainWindow.MainWindow() Line 30 C# [Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.RuntimeType.CreateInstanceSlow(bool publicOnly, bool skipCheckThis, bool fillCache, ref System.Threading.StackCrawlMark stackMark) Unknown mscorlib.dll!System.Activator.CreateInstance(System.Type type, bool nonPublic) Unknown mscorlib.dll!System.RuntimeType.CreateInstanceImpl(System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, object[] args, System.Globalization.CultureInfo culture, object[] activationAttributes, ref System.Threading.StackCrawlMark stackMark) Unknown mscorlib.dll!System.Activator.CreateInstance(System.Type type, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, object[] args, System.Globalization.CultureInfo culture, object[] activationAttributes) Unknown mscorlib.dll!System.Activator.CreateInstance(System.Type type, object[] args) Unknown System.Xaml.dll!System.Xaml.Schema.SafeReflectionInvoker.CreateInstanceCritical(System.Type type, object[] arguments) Unknown System.Xaml.dll!System.Xaml.Schema.SafeReflectionInvoker.CreateInstance(System.Type type, object[] arguments) Unknown System.Xaml.dll!System.Xaml.Schema.XamlTypeInvoker.CreateInstanceWithActivator(System.Type type, object[] arguments) Unknown System.Xaml.dll!System.Xaml.Schema.XamlTypeInvoker.CreateInstance(object[] arguments) Unknown System.Xaml.dll!MS.Internal.Xaml.Runtime.ClrObjectRuntime.CreateInstanceWithCtor(System.Xaml.XamlType xamlType, object[] args) Unknown System.Xaml.dll!MS.Internal.Xaml.Runtime.ClrObjectRuntime.CreateInstance(System.Xaml.XamlType xamlType, object[] args) Unknown System.Xaml.dll!MS.Internal.Xaml.Runtime.PartialTrustTolerantRuntime.CreateInstance(System.Xaml.XamlType xamlType, object[] args) Unknown System.Xaml.dll!System.Xaml.XamlObjectWriter.Logic_CreateAndAssignToParentStart(MS.Internal.Xaml.Context.ObjectWriterContext ctx) Unknown System.Xaml.dll!System.Xaml.XamlObjectWriter.WriteStartMember(System.Xaml.XamlMember property) Unknown System.Xaml.dll!System.Xaml.XamlWriter.WriteNode(System.Xaml.XamlReader reader) Unknown PresentationFramework.dll!System.Windows.Markup.WpfXamlLoader.TransformNodes(System.Xaml.XamlReader xamlReader, System.Xaml.XamlObjectWriter xamlWriter, bool onlyLoadOneNode, bool skipJournaledProperties, bool shouldPassLineNumberInfo, System.Xaml.IXamlLineInfo xamlLineInfo, System.Xaml.IXamlLineInfoConsumer xamlLineInfoConsumer, MS.Internal.Xaml.Context.XamlContextStack stack, System.Windows.Markup.IStyleConnector styleConnector) Unknown PresentationFramework.dll!System.Windows.Markup.WpfXamlLoader.Load(System.Xaml.XamlReader xamlReader, System.Xaml.IXamlObjectWriterFactory writerFactory, bool skipJournaledProperties, object rootObject, System.Xaml.XamlObjectWriterSettings settings, System.Uri baseUri) Unknown PresentationFramework.dll!System.Windows.Markup.WpfXamlLoader.LoadBaml(System.Xaml.XamlReader xamlReader, bool skipJournaledProperties, object rootObject, System.Xaml.Permissions.XamlAccessLevel accessLevel, System.Uri baseUri) Unknown PresentationFramework.dll!System.Windows.Markup.XamlReader.LoadBaml(System.IO.Stream stream, System.Windows.Markup.ParserContext parserContext, object parent, bool closeStream) Unknown PresentationFramework.dll!System.Windows.Application.LoadBamlStreamWithSyncInfo(System.IO.Stream stream, System.Windows.Markup.ParserContext pc) Unknown PresentationFramework.dll!System.Windows.Application.LoadComponent(System.Uri resourceLocator, bool bSkipJournaledProperties) Unknown PresentationFramework.dll!System.Windows.Application.DoStartup() Unknown PresentationFramework.dll!System.Windows.Application..ctor.AnonymousMethod__1_0(object unused) Unknown WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate callback, object args, int numArgs) Unknown WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.TryCatchWhen(object source, System.Delegate callback, object args, int numArgs, System.Delegate catchHandler) Unknown WindowsBase.dll!System.Windows.Threading.Dispatcher.WrappedInvoke(System.Delegate callback, object args, int numArgs, System.Delegate catchHandler) Unknown WindowsBase.dll!System.Windows.Threading.DispatcherOperation.InvokeImpl() Unknown WindowsBase.dll!System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(object state) Unknown mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) Unknown mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) Unknown mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) Unknown WindowsBase.dll!MS.Internal.CulturePreservingExecutionContext.Run(MS.Internal.CulturePreservingExecutionContext executionContext, System.Threading.ContextCallback callback, object state) Unknown WindowsBase.dll!System.Windows.Threading.DispatcherOperation.Invoke() Unknown WindowsBase.dll!System.Windows.Threading.Dispatcher.ProcessQueue() Unknown WindowsBase.dll!System.Windows.Threading.Dispatcher.WndProcHook(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam, ref bool handled) Unknown WindowsBase.dll!MS.Win32.HwndWrapper.WndProc(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam, ref bool handled) Unknown WindowsBase.dll!MS.Win32.HwndSubclass.DispatcherCallbackOperation(object o) Unknown WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate callback, object args, int numArgs) Unknown WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.TryCatchWhen(object source, System.Delegate callback, object args, int numArgs, System.Delegate catchHandler) Unknown WindowsBase.dll!System.Windows.Threading.Dispatcher.WrappedInvoke(System.Delegate callback, object args, int numArgs, System.Delegate catchHandler) Unknown WindowsBase.dll!System.Windows.Threading.Dispatcher.LegacyInvokeImpl(System.Windows.Threading.DispatcherPriority priority, System.TimeSpan timeout, System.Delegate method, object args, int numArgs) Unknown WindowsBase.dll!System.Windows.Threading.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority priority, System.Delegate method, object arg) Unknown WindowsBase.dll!MS.Win32.HwndSubclass.SubclassWndProc(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam) Unknown [Native to Managed Transition]
[Managed to Native Transition]
WindowsBase.dll!System.Windows.Threading.Dispatcher.TranslateAndDispatchMessage(ref System.Windows.Interop.MSG msg) Unknown WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame frame) Unknown WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrame(System.Windows.Threading.DispatcherFrame frame) Unknown WindowsBase.dll!System.Windows.Threading.Dispatcher.Run() Unknown PresentationFramework.dll!System.Windows.Application.RunDispatcher(object ignore) Unknown PresentationFramework.dll!System.Windows.Application.RunInternal(System.Windows.Window window) Unknown PresentationFramework.dll!System.Windows.Application.Run(System.Windows.Window window) Unknown PresentationFramework.dll!System.Windows.Application.Run() Unknown AlbumApp.Admin.exe!AlbumApp.Admin.App.Main() Unknown [Native to Managed Transition]
[Managed to Native Transition]
mscorlib.dll!System.AppDomain.nExecuteAssembly(System.Reflection.RuntimeAssembly assembly, string[] args) Unknown mscorlib.dll!System.AppDomain.ExecuteAssembly(string assemblyFile, System.Security.Policy.Evidence assemblySecurity, string[] args) Unknown Microsoft.VisualStudio.HostingProcess.Utilities.dll!Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() Unknown mscorlib.dll!System.Threading.ThreadHelper.ThreadStart_Context(object state) Unknown mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) Unknown mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) Unknown mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) Unknown mscorlib.dll!System.Threading.ThreadHelper.ThreadStart() Unknown

Upvotes: 2

Views: 936

Answers (1)

Joe
Joe

Reputation: 4183

The ViewModelBase class contains the AutoFac Container which gets populated in the App.xaml.cs. Initialize the ViewModels by resolving them from the Container.

Updated MainViewModel.cs

  public class MainViewModel : ViewModelBase
  {
    public MainViewModel() { } 

    public DashboardViewModel DashboardViewModel {
      get { return Container.Resolve<DashboardViewModel>(); }    private set { } }

    public MaintainAlbumsViewModel MaintainAlbumsViewModel {
      get { return Container.Resolve<MaintainAlbumsViewModel>(); }     private set { } }

    public OrdersViewModel OrdersViewModel {
      get { return Container.Resolve<OrdersViewModel>(); }       private set { }
    }
  }

Upvotes: 1

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