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背景

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

但是会引发错误

可以使用可用的服务和参数调用在'MyApp.Data.Repository.MyRepository'类型上找到'Autofac.Core.Activators.Reflection.DefaultConstructorFinder'的构造函数:\ r \n无法解析参数'MyApp.Data.CustomContext构造函数的上下文'Void .ctor(MyApp.Data.CustomContext)'."

有没有其他人经历过这种行为？

Answer 1

存储库CustomerContext在您注册时直接在其构造函数中请求,DbContext因此容器不知道如何解决CustomerContext

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