DbContext 没有被 autofac 注入

Question

我有一个问题，我的上下文没有在我的 startup.cs 中注册

我的完整启动看起来像

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();

    }

}

我的上下文类没什么特别的

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

    }
}

我尝试在标准庄园中注入上下文

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

但是会抛出错误

在类型 'MyApp.Data.Repository.MyRepository' 上找到的带有 'Autofac.Core.Activators.Reflection.DefaultConstructorFinder' 的构造函数都不能用可用的服务和参数调用：\\r\\n无法解析参数 'MyApp.Data.CustomContext构造函数‘Void .ctor(MyApp.Data.CustomContext)’的上下文’。”

有没有其他人经历过这种行为？

Answer 1

当您将其注册为DbContext时，存储库直接在其构造函数中要求CustomerContext ，因此容器不知道如何解析CustomerContext

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

Answer 2

将CustomContext注册为IDbContext并且MyRepository的构造函数的参数应该是IDbContext 。