我试图使用Unity容器来更容易地对我的控制器进行单元测试.我的控制器使用一个接受Repository接口的构造函数.在global.asax文件中,我实例化一个UnityContainerFactory并将其注册到MVC框架中,然后注册存储库及其实现.我将[Dependency]属性添加到控制器的CTOR Repository参数.这一切似乎都可以正常工作,除了偶尔工厂的GetControllerInstance(类型controllerType)被多次调用,并且作为controllerType传递一个空参数.

对工厂的第一次调用是正确的,controllerType“ProductsController”作为参数传入.但有时候,工厂被称为几次,视图被显示为一个空值为控制器,我不知道为什么.当控制器类型的正确值通过“调用堆栈”对我有意义,但是当通过null时,我不知道为什么或正在进行调用.有任何想法吗？

示例的代码和调用堆栈如下所示.

调用堆栈时工作

Test.DLL！Test.UnityHelpers.UnityControllerFactory.GetControllerInstance(System.Type controllerType = {Name =“ProductsController”FullName =“Test.Controllers.ProductsController”})行23 C#
Test.DLL！Test._Default.Page_Load(object sender = {ASP.default_aspx},System.EventArgs e = {System.EventArgs})行18 0x1a bytes C#

在controllerType传递NULL时调用堆栈

Test.DLL！Test.UnityHelpers.UnityControllerFactory.GetControllerInstance(System.Type controllerType = null)第27行C#

首先我创建了一个UnityControllerFactory

public class UnityControllerFactory : DefaultControllerFactory
{
    UnityContainer container;

    public UnityControllerFactory(UnityContainer container)
    {
        this.container = container;
    }

    protected override IController GetControllerInstance(Type controllerType)
    {
        if (controllerType != null)
        {
            return container.Resolve(controllerType) as IController;
        }
        else
        {
            return null; // I never expect to get here,but I do sometimes,the callstack does not show the caller
        }
    }
}

接下来,我添加了以下代码global.asax文件来实例化容器工厂

protected void Application_Start()
    {
        RegisterRoutes(RouteTable.Routes);

        // Create Unity Container if needed
        if (_container == null)
        {
            _container = new UnityContainer();
        }

        // Instantiate a new factory
        IControllerFactory unityControllerFactory = new UnityControllerFactory(_container);

        // Register it with the MVC framework
        ControllerBuilder.Current.SetControllerFactory(unityControllerFactory);

        // Register the sqlProductRepository
        _container.RegisterType<IProductsRepository,sqlProductRepository>
            (new ContainerControlledLifetimeManager());
    }

该应用程序有一个控制器

public class ProductsController : Controller
{
    public IProductsRepository productsRepository;

    public ProductsController([Dependency]IProductsRepository productsRepository)
    {
       this.productsRepository = productsRepository;
    }
}

if (controllerType != null)
    {
        return container.Resolve(controllerType) as IController;
    }
    else
    {
        return base.GetControllerInstance(requestContext,controllerType);
    }