如何配置 Web API 2 和结构图

Question

我浏览了多个博客等，试图找出如何使用 Web API 2 配置 StructureMap，但没有一个实现对我有用。混淆似乎在于 MVC 使用的不同 IDependency Resolver 和 Web API 使用的 IDependency Resolver。

首先，哪个是正确的 Nuget 包，其次，如何使用纯 Web API 2 项目对其进行配置？

谢谢

这是我到目前为止所拥有的，它似乎正在工作。这是正确的吗？

 public class StructureMapControllerActivator : IHttpControllerActivator
{
    private readonly IContainer _container;

    public StructureMapControllerActivator(IContainer container)
    {
        if (container == null) throw new ArgumentNullException("container");
        _container = container;
    }

    public IHttpController Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)
    {
        try
        {
            var scopedContainer = _container.GetNestedContainer();
            scopedContainer.Inject(typeof(HttpRequestMessage), request);
            request.RegisterForDispose(scopedContainer);
            return (IHttpController)scopedContainer.GetInstance(controllerType);
        }
        catch (Exception e)
        {
            // TODO : Logging
            throw e;
        }
    }
}

Answer 1

有一个 nuget：https://www.nuget.org/packages/WebApi.StructureMap/

public class Global : System.Web.HttpApplication
{
    protected void Application_Start(object sender, EventArgs e)
    {
        GlobalConfiguration.Configuration.UseStructureMap<Registry>();

        // Or

        GlobalConfiguration.Configuration.UseStructureMap(x =>
        {
            x.AddRegistry<Registry1>();
            x.AddRegistry<Registry2>();
        });

        ...
    }
}

Answer 2

链接很少，我是否试图解释我们如何（轻松地）同时使用 StructureMap 和 Web API：

• WebAPI + APIController with structureMap
• Configuring dependency injection with ASP.NET Web API 2.1

我们必须实现IHttpControllerActivator，这可以从已经配置的StructureMap ObjectFactory中获益：

public class ServiceActivator : IHttpControllerActivator
{
    public ServiceActivator(HttpConfiguration configuration) {}    

    public IHttpController Create(HttpRequestMessage request
        , HttpControllerDescriptor controllerDescriptor, Type controllerType)
    {
        var controller = ObjectFactory.GetInstance(controllerType) as IHttpController;
        return controller;
    }
}

然后，我们只需要注册我们的实现(global.asax)：

protected void Application_Start()
{
    ...
    HttpConfiguration config = GlobalConfiguration.Configuration;
    config.Services
          .Replace(typeof(IHttpControllerActivator), new ServiceActivator(config));
    ...