Autofac没有使用参数

Question

Autofac的默认设置是使用具有最多参数的构造函数，但它始终遵循无参数默认构造函数。

消费类：

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();

    }
  }
}

当我在breakpoint上设置builder.Build并检查ComponentRegistry时，它包含ServiceFactory。

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

我还在MainViewModel的两个构造函数上设置了断点，只有默认构造函数被命中，因此_serviceFactory为空。

如何让Autofac注入ServiceFactory？

在无参数构造函数上调用堆栈：

  

AlbumApp.Admin.exe！AlbumApp.Admin.ViewModels.MainViewModel.MainViewModel（）第15行C＃       AlbumApp.Admin.exe！AlbumApp.Admin.MainWindow.MainWindow（）第30行C＃       [原产于管理过渡]
      [管理到原生过渡]
      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类型，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）未知       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）未知       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的XamlWriter，布尔onlyLoadOneNode，布尔skipJournaledProperties，布尔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（）未知       PresentationFramework.dll！System.Windows.Application..ctor.AnonymousMethod__1_0（对象未使用）未知       WindowsBase.dll！System.Windows.Threading.ExceptionWrapper.InternalRealCall（System.Delegate callback，object args，int numArgs）Unknown       WindowsBase.dll！System.Windows.Threading.ExceptionWrapper.TryCatchWhen（对象源，System.Delegate回调，对象args，int numArgs，System.Delegate catchHandler）未知       WindowsBase.dll！System.Windows.Threading.Dispatcher.WrappedInvoke（System.Delegate回调，对象args，int numArgs，System.Delegate catchHandler）未知       WindowsBase.dll！System.Windows.Threading.DispatcherOperation.InvokeImpl（）未知       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（）未知       WindowsBase.dll！System.Windows.Threading.Dispatcher.ProcessQueue（）未知       WindowsBase.dll！System.Windows.Threading.Dispatcher.WndProcHook（System.IntPtr hwnd，int msg，System.IntPtr wParam，System.IntPtr lParam，ref bool handling）Unknown       WindowsBase.dll！MS.Win32.HwndWrapper.WndProc（System.IntPtr hwnd，int msg，System.IntPtr wParam，System.IntPtr lParam，ref bool handling）Unknown       WindowsBase.dll！MS.Win32.HwndSubclass.DispatcherCallbackOperation（object o）未知       WindowsBase.dll！System.Windows.Threading.ExceptionWrapper.InternalRealCall（System.Delegate callback，object args，int numArgs）Unknown       WindowsBase.dll！System.Windows.Threading.ExceptionWrapper.TryCatchWhen（对象源，System.Delegate回调，对象args，int numArgs，System.Delegate catchHandler）未知       WindowsBase.dll！System.Windows.Threading.Dispatcher.WrappedInvoke（System.Delegate回调，对象args，int numArgs，System.Delegate catchHandler）未知       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）未知       [原产于管理过渡]
      [管理到原生过渡]
      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（）未知       PresentationFramework.dll！System.Windows.Application.RunDispatcher（object ignore）未知       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（）未知       AlbumApp.Admin.exe！AlbumApp.Admin.App.Main（）未知       [原产于管理过渡]
      [管理到原生过渡]
      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（）未知       mscorlib.dll！System.Threading.ThreadHelper.ThreadStart_Context（object state）未知       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（）未知

Answer 1

produceOutput类包含ViewModelBase AutoFac，其填充在Container中。通过从App.xaml.cs解析ViewModels来初始化Container。

更新了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 { }
    }
  }