帶有 Sitecore 和 WebApi 控制器的 SimpleInjector 沒有默認構造函數

Question

我們已經集成SimpleInjector（ 4.4.x我們） Sitecore 8.2螺旋項目。

我們的基礎層中有一個依賴注入項目，它由以下管道組成：

public void Process(PipelineArgs args)
{
    var container = new Container();
    container.Options.DefaultScopedLifestyle = new WebRequestLifestyle();

    // register app dependencies (omitted for readability)

    // get assemblies of our application
    container.RegisterMvcControllers(assemblies);
    container.RegisterWebApiControllers(GlobalConfiguration.Configuration,assemblies);

    container.Verify();

    DependencyResolver.SetResolver(new SimpleInjectorDependencyResolver(container));
    GlobalConfiguration.Configuration.DependencyResolver =
        new SimpleInjectorWebApiDependencyResolver(container);
}

也如上述這篇文章中，流水線處理機在Sitecore的實現initialize管道：

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <pipelines>
      <initializeDependencyInjection/>
      <initialize>
        <processor type="Company.Foundation.Example.DependencyInjectionProcessor, Company.Foundation.Example"
                   patch:before="processor[@type='Sitecore.Mvc.Pipelines.Loader.InitializeControllerFactory, Sitecore.Mvc']" />
      </initialize>
    </pipelines>
  </sitecore>
</configuration>

如您所見，同時使用了ASP.NET MVC和WebApi ( .NET 4.6 )。 我們的解決方案僅包含 MVC 控制器。 我們試圖實現的是在我們的解決方案中引入WebApi 。 添加以下控制器時，一切正常：

public class HelloController : ApiController
{
    [HttpGet, Route("api/hello")]
    public IHttpActionResult Get()
    {
        return Ok("Hello World!");
    }
}

但是當我添加依賴項（並注冊）時，例如：

public interface IFoo
{
    string Hello { get; }
}

public class Foo : IFoo
{
    public string Hello => "Hello World!";
}

public class HelloController : ApiController
{
    private readonly IFoo _foo;

    public HelloController(IFoo foo)
    {
        _foo = foo;
    }

    [HttpGet, Route("api/hello")]
    public IHttpActionResult Get()
    {
        return Ok(_foo.Hello);
    }
}

執行 HTTP 請求時，我在運行時收到以下異常消息：

System.InvalidOperationException：嘗試創建類型為“HelloController”的控制器時出錯。 確保控制器具有無參數的公共構造函數。

堆棧跟蹤：

at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)
at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__15.MoveNext()

內部異常：

System.ArgumentException：類型“Company.Feature.Example.HelloController”沒有默認構造函數

at System.Linq.Expressions.Expression.New(Type type)
at System.Web.Http.Internal.TypeActivator.Create[TBase](Type instanceType)
at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.GetInstanceOrActivator(HttpRequestMessage request, Type controllerType, Func`1& activator)
at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)

讓我感到奇怪的是container.Verify()不會拋出任何異常或警告。 調試的時候可以看到在container的Root Registrations中注冊了HelloController 。

WebApi的綁定重定向WebApi根項目的web.config中設置：

<dependentAssembly>
  <assemblyIdentity name="System.Web.Http" publicKeyToken="31bf3856ad364e35" xmlns="urn:schemas-microsoft-com:asm.v1" />
  <bindingRedirect oldVersion="0.0.0.0-5.2.3.0" newVersion="5.2.3.0" xmlns="urn:schemas-microsoft-com:asm.v1" />
</dependentAssembly>

Answer 1

根據這個答案，正如史蒂文在評論中所建議的那樣，依賴解析器稍后會在 Sitecore 管道中被覆蓋。

我擴展了initialize管道：

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <pipelines>
      <initializeDependencyInjection/>
      <initialize>
        <processor type="Company.Foundation.Example.DependencyInjectionProcessor, Company.Foundation.Example"
                   patch:before="processor[@type='Sitecore.Mvc.Pipelines.Loader.InitializeControllerFactory, Sitecore.Mvc']" />
        <processor type=" Company.Foundation.Example.WebApiDependenceResolverProcessor, Company.Foundation.Example"
                   patch:after="*[@type='Sitecore.PathAnalyzer.Services.Pipelines.Initialize.WebApiInitializer, Sitecore.PathAnalyzer.Services']" />
      </initialize>
    </pipelines>
  </sitecore>
</configuration>

我還添加了以下處理器：

public class WebApiDependenceResolverProcessor
{
    public void Process(PipelineArgs args)
    {
        // retrieve container here

        GlobalConfiguration.Configuration.DependencyResolver = new SimpleInjectorWebApiDependencyResolver(container);
    }
}

在這里，我們設置了 Sitecore 重置WebApi后的依賴解析器。