Question

我需要在控制器操作中调用CompositionContainer.GetExportedValue<>。我使用MefContrib，我需要知道如何以及在何处将CompositionContainer本身添加到目录中，以便我可以在控制器中导入它。

更新这是'AppStart_MefContribMVC3.cs'的内容，我相信MefContrib正在配置它的目录。这里没有在CompositionContainer上签名！

public static class AppStart_MefContribMVC3
{
    public static void Start()
    {
        // Register the CompositionContainerLifetimeHttpModule HttpModule.
        // This makes sure everything is cleaned up correctly after each request.
        CompositionContainerLifetimeHttpModule.Register();

        // Create MEF catalog based on the contents of ~/bin.
        //
        // Note that any class in the referenced assemblies implementing in "IController"
        // is automatically exported to MEF. There is no need for explicit [Export] attributes
        // on ASP.NET MVC controllers. When implementing multiple constructors ensure that
        // there is one constructor marked with the [ImportingConstructor] attribute.
        var catalog = new AggregateCatalog(
            new DirectoryCatalog("bin"),
            new ConventionCatalog(new MvcApplicationRegistry())); // Note: add your own (convention)catalogs here if needed.

        // Tell MVC3 to use MEF as its dependency resolver.
        var dependencyResolver = new CompositionDependencyResolver(catalog);
        DependencyResolver.SetResolver(dependencyResolver);

        // Tell MVC3 to resolve dependencies in controllers
        ControllerBuilder.Current.SetControllerFactory(
            new CompositionControllerFactory(
                new CompositionControllerActivator(dependencyResolver)));

        // Tell MVC3 to resolve dependencies in filters
        FilterProviders.Providers.Remove(FilterProviders.Providers.Single(f => f is FilterAttributeFilterProvider));
        FilterProviders.Providers.Add(new CompositionFilterAttributeFilterProvider(dependencyResolver));

        // Tell MVC3 to resolve dependencies in model validators
        ModelValidatorProviders.Providers.Remove(ModelValidatorProviders.Providers.OfType<DataAnnotationsModelValidatorProvider>().Single());
        ModelValidatorProviders.Providers.Add(
            new CompositionDataAnnotationsModelValidatorProvider(dependencyResolver));

        // Tell MVC3 to resolve model binders through MEF. Note that a model binder should be decorated
        // with [ModelBinderExport].
        ModelBinderProviders.BinderProviders.Add(
            new CompositionModelBinderProvider(dependencyResolver));
    }
}

Answer 1

I need to know how

CompositionContainer就像任何其他object一样，您可以使用以下声明添加它：

CompositionContainer.ComposeExportedValue(CompositionContainer);

and where should I add the CompositionContainer

就这一点而言，我需要看一些代码来建议应该添加的位置以及导出CompositionContainer是否是最佳策略。

Answer 2

事实证明，使用MefContrib，您不需要CompositionContainer来解析导出的类型。以下是它的完成方式：

DependencyResolver.Current.GetService<SomeTypeName>()

MefContrib：如何导出合成容器

2 个答案: