最佳实践：StructureMap 和 ASP.NET MVC 2 - 抽象基础控制器中的 Setter 注入/构造注入

Question

public abstract class ConventionController : Controller
{
    public const int PageSize = 5;

    public IMappingService MappingService { get; set;}
}

如何设置 StructureMap 来获取 IMappingService 的实例？

编辑：

在Joshua Flanagan的帮助下，我现在有了以下代码：

EmployeeController

public class EmployeeController : ConventionController
{
    private readonly ITeamEmployeeRepository _teamEmployeeRepository;

    public EmployeeController(ITeamEmployeeRepository teamEmployeeRepository)
    {
        _teamEmployeeRepository = teamEmployeeRepository;
    }

    public ActionResult Index(int page = 1)
    {
        // The IMappingService dependency is hidden in the AutoMappedHybridView method that is a part of the ConventionController, easy use in the controller
        return AutoMappedHybridView<TeamEmployee, TeamEmployeeForm>(_teamEmployeeRepository.GetPagedEmployees(page, PageSize));

       // With constructor injection I had to write this ...
       // return new HybridViewResult<TSourceElement, TDestinationElement>(_mappingService, _teamEmployeeRepository.GetPagedEmployees(page, PageSize));
    }
 }

ConventionController

public abstract class ConventionController : Controller
{
    public const int PageSize = 5;

    // This property is inject via StructureMap
    public IMappingService MappingService { get; private set; }

    public HybridViewResult<TSourceElement, TDestinationElement> AutoMappedHybridView<TSourceElement,TDestinationElement>(PagedList<TSourceElement> pagedList, string viewNameForAjaxRequest)
    {
        return new HybridViewResult<TSourceElement, TDestinationElement>(MappingService, pagedList, viewNameForAjaxRequest);
    }

    public HybridViewResult<TSourceElement, TDestinationElement> AutoMappedHybridView<TSourceElement,TDestinationElement>(PagedList<TSourceElement> pagedList)
    {
        return new HybridViewResult<TSourceElement, TDestinationElement>(MappingService, pagedList);
    }

    public HybridViewResult<TSourceElement, TDestinationElement> AutoMappedHybridView<TSourceElement, TDestinationElement>(TSourceElement sourceElement)
    {
        return new HybridViewResult<TSourceElement, TDestinationElement>(MappingService, sourceElement);
    }

    public HybridViewResult<TSourceElement, TDestinationElement> AutoMappedHybridView<TSourceElement, TDestinationElement>(TSourceElement sourceElement, string viewNameForAjaxRequest)
    {
        return new HybridViewResult<TSourceElement, TDestinationElement>(MappingService, sourceElement, viewNameForAjaxRequest);
    }
}

HybridViewResult< /strong>

public class HybridViewResult<TSourceElement, TDestinationElement> : BaseHybridViewResult
{
    public HybridViewResult(IMappingService mappingService, PagedList<TSourceElement> pagedList)
    {
        ViewModel = mappingService.MapToViewModelPagedList<TSourceElement, TDestinationElement>(pagedList);
    }

    public HybridViewResult(IMappingService mappingService, PagedList<TSourceElement> pagedList, string viewNameForAjaxRequest)
    {
        ViewNameForAjaxRequest = viewNameForAjaxRequest;
        ViewModel = mappingService.MapToViewModelPagedList<TSourceElement, TDestinationElement>(pagedList);
    }

    public HybridViewResult(IMappingService mappingService, TSourceElement model)
    {
        ViewModel = mappingService.Map<TSourceElement, TDestinationElement>(model);
    }

    public HybridViewResult(IMappingService mappingService, TSourceElement model, string viewNameForAjaxRequest)
    {
        ViewNameForAjaxRequest = viewNameForAjaxRequest;
        ViewModel = mappingService.Map<TSourceElement, TDestinationElement>(model);
    }
}

如您所见，HybridViewResult 需要 IMappingService 依赖项。

如果我在 ConventionController 中使用构造函数，我会“污染”我的 EmployeeController （恕我直言）。

如果 EmployeeController 直接需要 IMapping 依赖项，我将使用构造函数进行注入。但这不是必需的，因为 ConventionController 已经有 IMapping 属性。所以正如Darin Dimitrov所说，这违反了DI原则。

如何重构我的代码？我真的必须使用构造函数注入吗？

编辑 2

我如何命令 StructureMap 创建 HybridViewResult 的实例？如果这可能的话，控制器就不需要知道 IMapping 依赖关系。是否有可能从 StructureMap 获取通用对象（未装箱）？

Answer 1

实际上，不，SetAllProperties() 不适用于抽象类。这是 Structuremap 实现中的一个弱点。我为你感到抱歉，就像我为自己感到抱歉一样，属性注入不适用于基本抽象类。对于基本抽象类，您将需要使用构造函数注入（与这里的所有炒作相反，这并不总是满足依赖关系时的最佳方法）。

Answer 2

我假设您已经从 StructureMap 中获取了控制器。如果是这种情况，您只需将 SetAllProperties() 调用添加到容器配置中即可。 SetAllProperties 允许您定义应注入的属性的标准。