DbContext 沒有被 autofac 注入

Question

我有一個問題，我的上下文沒有在我的 startup.cs 中注冊

我的完整啟動看起來像

public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        var builder = new ContainerBuilder();
        RegisterApiTypes(builder);

        var config = new HttpConfiguration();

        // Register your Web API controllers.
        builder.RegisterApiControllers(Assembly.GetExecutingAssembly());

        //Register filters
        builder.RegisterWebApiFilterProvider(GlobalConfiguration.Configuration);

        var container = builder.Build();
        config.DependencyResolver = new AutofacWebApiDependencyResolver(container);
        GlobalConfiguration.Configuration.DependencyResolver = new AutofacWebApiDependencyResolver(container);

        app.UseAutofacMiddleware(container);
        app.UseAutofacWebApi(config);
        app.UseWebApi(config);
    }

    private static void RegisterApiTypes(ContainerBuilder builder)
    {
        builder.RegisterType<Logger>()
           .As<ILogger>()
           .InstancePerRequest();
        builder.RegisterType<ApplicationService>().As<IApplicationService>().InstancePerLifetimeScope();
        builder.RegisterType<CardRepository>().As<ICardRepository>().InstancePerLifetimeScope();
        //tried both of these without any luck
        //builder.RegisterType(typeof(CustomContext)).As(typeof(DbContext)).InstancePerRequest();
        //builder.RegisterType<CustomContext>().As<DbContext>().InstancePerRequest();

        builder.RegisterAssemblyTypes(Assembly.Load("MyApp.Data"))
            .Where(t => t.Name.EndsWith("Repository"))
            .AsImplementedInterfaces()
            .InstancePerLifetimeScope();

    }

}

我的上下文類沒什么特別的

public class CustomContext:DbContext
{
    public CustomContext() : base("DefaultConnection")
    {

    }
}

我嘗試在標准庄園中注入上下文

public MyRepository(CustomContext context)
{
    _context = context;
}

但是會拋出錯誤

在類型 'MyApp.Data.Repository.MyRepository' 上找到的帶有 'Autofac.Core.Activators.Reflection.DefaultConstructorFinder' 的構造函數都不能用可用的服務和參數調用：\\r\\n無法解析參數 'MyApp.Data.CustomContext構造函數‘Void .ctor(MyApp.Data.CustomContext)’的上下文’。”

有沒有其他人經歷過這種行為？

Answer 1

當您將其注冊為DbContext時，存儲庫直接在其構造函數中要求CustomerContext ，因此容器不知道如何解析CustomerContext

builder.RegisterType<CustomContext>().InstancePerRequest();

Answer 2

將CustomContext注冊為IDbContext並且MyRepository的構造函數的參數應該是IDbContext 。