Question

我有以下构造函数（只有一个用于控制器）：

[Authorize]
public class AccountController : Controller
{
    public AccountController(ApplicationUserManager userManager, ApplicationSignInManager signInManager,
        IAccountService accountSrv)
    {
        UserManager = userManager;
        SignInManager = signInManager;
        AccountService = accountSrv;
    }

    private IAccountService AccountService { get; }

    private ApplicationSignInManager SignInManager { get; }

    private ApplicationUserManager UserManager { get; }

我希望MVC用适当的参数调用它，所以我尝试了这个：
的Global.asax.cs

public class MvcApplication : HttpApplication
{
    protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);
        DALMapper.Mapping();
        LabMapper.Mapping();

        var container = new UnityContainer();
        container
            .RegisterType<IDALContext, DALContext>()
            .RegisterType<IConsultantService, ConsultantService>()
            .RegisterType<IProjectService, ProjectService>()
            .RegisterType<IAccountService, AccountService>()
            .RegisterType<AccountController, AccountController>()
            .RegisterType<ApplicationUserManager, ApplicationUserManager>()
            .RegisterType<ApplicationSignInManager, ApplicationSignInManager>()
            .RegisterInstance<IAccountService>(new AccountService(new DALContext()), new ContainerControlledLifetimeManager())
        ;

        DependencyResolver.SetResolver(new UnityDependencyResolver(container));

（UnityDependencyResolver是:)

public class UnityDependencyResolver : IDependencyResolver
{
    private readonly IUnityContainer _container;

    public UnityDependencyResolver(IUnityContainer container)
    {
        _container = container;
    }

    public object GetService(Type serviceType)
    {
        try
        {
            return _container.Resolve(serviceType);
        }
        catch
        {
            return null;
        }
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        try
        {
            return _container.ResolveAll(serviceType);
        }
        catch
        {
            return new List<object>();
        }
    }
}

我在哪里注册所需的所有类型（结果感觉很奇怪，但是当进/出类型相同时（我是Unity的新手））。

但它不起作用。（据我所知，自MV3以来，默认控制器工厂将使用服务定位器，因此不需要实现它自己的工厂）。

出了什么问题？

目前的结果：

Server Error in '/' Application.

No parameterless constructor defined for this object.

Answer 1

如果我正确理解您的问题，则解决ApplicationUserManager和ApplicationSignInManager的依赖关系时出现问题。这是为我解决问题的代码：

//for accountcontroller
        container.RegisterType<DbContext, ApplicationDBContext>(new HierarchicalLifetimeManager());
        container.RegisterType<UserManager<ApplicationUser>>(new HierarchicalLifetimeManager());
        container.RegisterType<IUserStore<ApplicationUser>, UserStore<ApplicationUser>>(new HierarchicalLifetimeManager());
        container.RegisterType<IAuthenticationManager>(new InjectionFactory(o => HttpContext.Current.GetOwinContext().Authentication));

Answer 2

在深入挖掘之后（下载Unity源代码，构建它，添加了对dll的引用，将pdb添加到符号位置（debug））*，我可以看到错误来自另一个构造函数requirs参数。

public class ApplicationUserManager : UserManager<ApplicationUser>
{
    public ApplicationUserManager(IUserStore<ApplicationUser> store)
        : base(store)
    {
    }

（我还没有解决这个问题，但这很容易）。

*是否有更简单的方法来进入第三方库的代码？请在评论中告诉我。

Unity IOC无法解决无参数构造函数问题

2 个答案: