【发布时间】:2019-02-07 20:01:05
【问题描述】:
我们已将 SimpleInjector (4.4.x) 集成到我们的 Sitecore 8.2 Helix 项目中。
我们在Foundation Layer 中有一个依赖注入项目,它由以下管道组成:
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);
}
同样如this post 中所述,流水线处理器在 Sitecore initialize 流水线中实现:
<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>
如您所见,ASP.NET MVC 和 WebApi 都被使用 (.NET 4.6)。
我们的解决方案仅包含 MVC 控制器。我们正在努力实现的是在我们的解决方案中引入WebApi。添加以下控制器时,一切正常:
public class HelloController : ApiController
{
[HttpGet, Route("api/hello")]
public IHttpActionResult Get()
{
return Ok("Hello World!");
}
}
但是当我添加一个依赖项(并注册)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);
}
}
在执行 HTTP 请求时,我在运行时收到以下异常消息:
System.InvalidOperationException:尝试创建“HelloController”类型的控制器时发生错误。确保控制器有一个无参数的公共构造函数。
堆栈跟踪:
at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)
at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__15.MoveNext()
内部异常:
System.ArgumentException:类型“Company.Feature.Example.HelloController”没有默认构造函数
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)
让我感到奇怪的是container.Verify() 不会抛出任何异常或警告。调试的时候可以看到HelloController注册在container的Root Registrations中。
WebApi 的绑定重定向也在根项目的web.config 中设置:
<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>
【问题讨论】:
-
我可以从异常详细信息中看到,由于某种原因(我不清楚),
DefaultHttpControllerActivator没有使用SimpleInjectorWebApiDependencyResolver,因为SimpleInjector.Integration.WebApi.SimpleInjectorWebApiDependencyResolver永远不会当DefaultHttpControllerActivator请求IHttpController派生时,返回null。也许GlobalConfiguration.Configuration.DependencyResolver稍后会再次被覆盖。您必须对此进行调试才能找出发生这种情况的原因。 -
嗨@Steven,您的时间正好是我偶然发现的那一刻:sitecore.stackexchange.com/questions/1739/… 事实上,在 Sitecore 管道的后期,实体
GlobalConfiguration被覆盖。我已经应用了补丁,它现在可以工作了。
标签: c# asp.net-mvc asp.net-web-api sitecore simple-injector