Question

DbContext注册

container.RegisterType<DbContext, MobileEntities>(GetLifetime());
container.RegisterType<DbContext, AuthenticationEntities>("AuthDb", GetLifetime());

通用存储库注册

container.RegisterType(typeof(IReadOnlyRepository<>), typeof(ReadOnlyRepository<>), GetLifetime());
container.RegisterType(typeof(IReadOnlyRepository<>), typeof(ReadOnlyRepository<>), "ReadOnlyAuth", GetLifetime(), new InjectionConstructor(
    container.Resolve<DbContext>("AuthDb")
));

上述存储库仅使用DbContext作为参数。我有多个我想根据提供的泛型参数注入的上下文。 是否可以在Unity配置中注入正确的DbContext类型而不构造或解析它的实例？

container.RegisterType<IUserPermissionService, UserPermissionService>(GetLifetime(), new InjectionConstructor(
    container.Resolve<IReadOnlyRepository<Customer>>("ReadOnlyAuth"),
    container.Resolve<IReadOnlyRepository<VisitPlan>>("ReadOnlyAuth"),
    container.Resolve<IReadOnlyRepository<UserBranch>>("ReadOnlyAuth"),
    container.Resolve<IReadOnlyRepository<UserRoute>>("ReadOnlyAuth"),
    container.Resolve<IReadOnlyRepository<UserDriverNumber>>("ReadOnlyAuth"),
    container.Resolve<IReadOnlyRepository<UserActivity>>("ReadOnlyAuth"),
    container.Resolve<IReadOnlyRepository<UserRole>>("ReadOnlyAuth")
));

我是否可以对其进行配置，以便上述Resolve<>次调用在他们分开注册之前不会执行？即，我是否可以对其进行配置，使其仅在解决“ReadOnlyAuth”请求时执行container.Resolve<DbContext>("AuthDb")。

Answer 1

您可以使用ResolvedParameter InjectionMember表示您希望稍后解决该值。将创建一个解析器，它将使用名称和类型在解析时获取依赖关系。

container.RegisterType<IUserPermissionService, UserPermissionService>(
    GetLifetime(), 
    new InjectionConstructor(
        new ResolvedParameter<IReadOnlyRepository<Customer>>("ReadOnlyAuth"),
        new ResolvedParameter<IReadOnlyRepository<VisitPlan>>("ReadOnlyAuth"),
        new ResolvedParameter<IReadOnlyRepository<UserBranch>>("ReadOnlyAuth"),
        new ResolvedParameter<IReadOnlyRepository<UserRoute>>("ReadOnlyAuth"),
        new ResolvedParameter<IReadOnlyRepository<UserDriverNumber>>("ReadOnlyAuth"),
        new ResolvedParameter<IReadOnlyRepository<UserActivity>>("ReadOnlyAuth"),
        new ResolvedParameter<IReadOnlyRepository<UserRole>>("ReadOnlyAuth")
    ));

在这些情况下，也可以使用InjectionFactory：

container.RegisterType<IUserPermissionService, UserPermissionService>(
    GetLifetime(), 
    new InjectionFactory(c =>
    {
        new UserPermissionService(
            c.Resolve<IReadOnlyRepository<Customer>>("ReadOnlyAuth"),
            c.Resolve<IReadOnlyRepository<VisitPlan>>("ReadOnlyAuth"),
            c.Resolve<IReadOnlyRepository<UserBranch>>("ReadOnlyAuth"),
            c.Resolve<IReadOnlyRepository<UserRoute>>("ReadOnlyAuth"),
            c.Resolve<IReadOnlyRepository<UserDriverNumber>>("ReadOnlyAuth"),
            c.Resolve<IReadOnlyRepository<UserActivity>>("ReadOnlyAuth"),
            c.Resolve<IReadOnlyRepository<UserRole>>("ReadOnlyAuth")
    }));

如果使用注入工厂，则需要进行编译时检查，以确保构造函数参数的类型正确。

是否可以注入正确的类型而不在Unity配置中构造或解析它的实例？

1 个答案: