我在WPF应用程序中使用Autofac进行依赖注入，无法解决此问题。

我创建了这个抽象类ListItemViewModelBase，其中两个类PasswordItemViewModel和CardItemViewModel继承。

列表项视图模型库. cs

    public abstract class ListItemViewModelBase
    {
        protected readonly IMessenger _messenger;
    
        public string Id { get; }
        public string Name { get; }
        public string Notes { get; }
    
        protected ListItemViewModelBase(IMessenger messenger, string id, string name, string notes)
        {
            _messenger = messenger;
    
            Id = id;
            Name = name;
            Notes = notes;
        }
    
        public abstract void SeeDetails();
    }

密码项视图模型. cs

    public partial class PasswordItemViewModel : ListItemViewModelBase
    {
        public string UserName { get; }
        public string Password { get; }
        public string Website { get; }
    
        public PasswordItemViewModel(IMessenger messenger, string id, string name, string userName, string password, string website, string notes) : base(messenger, id, name, notes)
        {
            UserName = userName;
            Password = password;
            Website = website;
        }
    
        [RelayCommand]
        public override void SeeDetails()
        {
            _messenger.Send(new PasswordDetailMessage(this));
        }
    }

CardItemViewModel. cs

    public partial class CardItemViewModel : ListItemViewModelBase
    {    
        public string CardNumber { get; }
        public int ExpMonth { get; }
        public int ExpYear { get; }
    
        public CardItemViewModel(IMessenger messenger, string id, string name, string cardNumber, int expMonth, int expYear, string notes) : base(messenger, id, name, notes)
        {
            CardNumber = cardNumber;
            ExpMonth = expMonth;
            ExpYear = expYear;
        }
    
        [RelayCommand]
        public override void SeeDetails()
        {
            _messenger.Send(new CardDetailMessage(this));
        }
    }

配置Autofac的App. xaml.cs如下所示：

xaml. cs

    public partial class App : Application
        {
            public static IServiceProvider ServiceProvider { get; private set; }
    
            [STAThread]
            public static void Main(string[] args)
            {
                using IHost host = CreateHostBuilder(args).Build();
    
                CreateGenericHost(host);
                InitAppAndRun();
            }
    
            private static void InitAppAndRun()
            {
                var app = new App();
                app.InitializeComponent();
                app.MainWindow = ServiceProvider.GetRequiredService();
                app.MainWindow!.Visibility = Visibility.Visible;
                app.Run();
            }
    
            #region Host builder
    
            private static IHostBuilder CreateHostBuilder(string[] args)
            {
                return Host.CreateDefaultBuilder(args)
                    .UseServiceProviderFactory(new AutofacServiceProviderFactory())
                    .ConfigureServices(ConfigureServices)
                    .ConfigureContainer(ConfigureAutofacBuilder);
            }
    
            private static void ConfigureAutofacBuilder(HostBuilderContext ctx, ContainerBuilder builder)
            {
                builder.RegisterModule>();
                builder.RegisterModule>();
    
                var config = new ConfigurationBuilder();
                config.AddJsonFile("autofac.json");
    
                var module = new ConfigurationModule(config.Build());
                builder.RegisterModule(module);
            }
    
            private static void CreateGenericHost(IHost host)
            {
                host.Start();
                ServiceProvider = host.Services;
            }
    
            private static void ConfigureServices(HostBuilderContext ctx, IServiceCollection services)
            {
                services.AddSingleton();
            }
            #endregion
        }

当我尝试启动应用程序时，程序在使用IHost host=CreateHostBuilder（args）的上失败。构建（）；并抛出此错误消息：

Autofac.Core.Activators.Reflection.NoConstructorsFoundException: 'No accessible constructors were found for the type 'TestApp.Bases.ListItemViewModelBase'.'

似乎Autofac无法解析ListItemViewModelBase类的非公共构造函数。有没有办法让Autofac解析这些类型的非公共构造函数？

谢了托拜厄斯

对Orenico回复的回应：

这是autoface. json，它基本上什么都不包含。

    {
      "modules": [],
      "components": []
    }