无参数公共构造函数

Question

第一次使用 MS Unity。我有一个带有以下构造函数的控制器：

 protected IAdministrationService AdministrationService { get; set; }

 public GenerateCacheController(IAdministrationService administrationService)
 {
    AdministrationService = administrationService;
 }

尝试运行项目时出现以下错误：

确保控制器有一个无参数的公共构造函数。

在我的 Bootstrpper.cs 文件中，RegisterTypes 方法中有以下内容：

container.RegisterType<GenerateCacheController>();

我仍然得到错误。我还缺少什么吗？我正在使用 ASP.NET MVC 5 和 Unity 3。

这是我的 Boostrapper.cs 文件：

 public static class Bootstrapper
{
    public static IUnityContainer Initialise()
    {
        var container = BuildUnityContainer();
        DependencyResolver.SetResolver(new UnityDependencyResolver(container));
        return container;
    }

    private static IUnityContainer BuildUnityContainer()
    {
        var container = new UnityContainer();
        RegisterTypes(container);
        return container;
    }

    public static void RegisterTypes(IUnityContainer container)
    {
        container.RegisterInstance(container);
        var im = new InjectionMember[0];
        container.RegisterType<IAdministrationService, AdministrationService>("AdministrationService", im);
        container.RegisterType<ILookupMapper, LookupMapper>("LookupMapper", im);
        container.RegisterType<IEmailService, EmailService>("EmailService", im);

        container.RegisterType<GenerateCacheController>();

        var provider = new UnityServiceLocator(container);
        ServiceLocator.SetLocatorProvider(() => provider);
    }
}

AdministrationService 类的缩略版：

 public class AdministrationService : IAdministrationService
{
    protected ILookupMapper LookupMapper { get; set; }
    protected IEmailService EmailService { get; set; }

    public AdministrationService(ILookupMapper lookupMapper, IEmailService emailService)
    {
        LookupMapper = lookupMapper;
        EmailService = emailService;
    }
}

Answer 1

发现问题。

我把这行注释掉了：

 var im = new InjectionMember[0];
 container.RegisterType<IAdministrationService, AdministrationService>("AdministrationService", im);

并添加：

container.RegisterType<IAdministrationService, AdministrationService>();

这很有效，因为以前的开发人员正在做这样的事情：

private IUnityContainer Container { get; set; }

public AdministrationService()
{
    Container = Microsoft.Practices.ServiceLocation.ServiceLocator.Current.GetInstance<IUnityContainer>();
}

而不是

protected ILookupMapper LookupMapper { get; set; }
protected IEmailService EmailService { get; set; }

public AdministrationService(ILookupMapper lookupMapper, IEmailService emailService)
{
    LookupMapper = lookupMapper;
    EmailService = emailService;
}

我必须回到他们的方式不破坏现有的代码。总有一天我会去重构。