Question

我在ASP.NET MVC应用程序上使用StructureMap和Entity Framework以及IRepository / IUnitOfWork模式。目标是将所有对象限定为当前HTTP请求，如下所示：

For<ObjectContext>()
    .HttpContextScoped()
        .Use<MembershipEntities>()
            .Ctor<string>("connectionString")
                .Is("name=MembershipEntities")
        .Named(MembershipObjectContextInstanceKey);

For<IObjectContext>()
    .HttpContextScoped()
        .Use<ObjectContextAdapter>()
            .Ctor<ObjectContext>("objectContext")
                .Is(c => c.GetInstance<ObjectContext>(MembershipObjectContextInstanceKey))
        .Named(MembershipIObjectContextInstanceKey);

For<IUnitOfWork>()
    .HttpContextScoped()
        .Use<UnitOfWork>()
            .Ctor<IObjectContext>("objectContext")
                .Is(x => x.GetInstance<IObjectContext>(MembershipIObjectContextInstanceKey))
        .Named(MembershipUOWInstanceKey);

For(typeof(IRepository<>))
    .HttpContextScoped()
        .Use(typeof(Repository<>))
            .CtorDependency<IObjectContext>("objectContext")
                .IsNamedInstance(MembershipIObjectContextInstanceKey)
        .Named(MembershipIRepositoryInstanceKey);

但是，当我运行此代码并获取IRepository和IUnitOfWork的命名实例时，它们的内部IObjectContexts不是同一个实例，这不是我的意图。

关于我做错的任何想法？任何帮助都将非常感激！

Answer 1

StructureMap支持两种形式的依赖注入：


构造函数注入 - 通过构造函数参数将“依赖”推入具体类中。

Setter Injection - 通过公共属性将依赖项“推送”到具体类中。 “Setter”命名法取自   Java的属性是getSomething（）和setSomething（value）。

我使用类似于以下的配置获得了很好的结果：

// In my projects, I have something like a DataContext (IDataContext's implementation) expose my ObjectContext...
// * You don't need to HttpContextScope everything, usually the ObjectContext is sufficient
For<ObjectContext>()
    .HttpContextScoped()
    .Use<MembershipEntities>()
    .Ctor<string>("connectionString")
    .Is("name=MembershipEntities")
    .Named(MembershipObjectContextInstanceKey);

// Usually, I don't abstract or wrap the ObjectContext, it is simply injected, under the hood
// ObjectContextAdapter receives an ObjectContext (HttpContextScoped)
For<IObjectContext>().Use<ObjectContextAdapter>();

// Ctor receives a IObjectContext
// * Again, if you have absolutely no use for IObjectContext, it shouldn't exist and UnitOfWork's ctor should receive the HttpContextScoped ObjectContext
For<IUnitOfWork>().Use<UnitOfWork>();

// Ctor receives a IObjectContext [...]
For(typeof(IRepository<>)).Use(typeof(Repository<>));

这或多或少都是我每次都这样做的。

让我知道它是否适合您。此致最大

StructureMap，实体框架和IRepository / IUnitOfWork配置

1 个答案: