用autofac解析控制器时的依赖性错误

我正在开发一个ASP.MVC应用程序。我使用Autofac进行DI。我的控制器以组装 'LK.Reports.Services.WebApi.Module' PayrollCenterReportsController的地方，需要在构造一些serivce：用autofac解析控制器时的依赖性错误

public class PayrollCenterReportsController : ODataControllerBase<PayrollCenterReports> 
    { 
     public PayrollCenterReportsController(IDataService<PayrollCenterReports> service) 
      : base(service) 
     { 
     } 
    }

我在其他装配

public class MenaAutofacInitializer : IAutofacIntitializer 
    { 
     public void Initialize(ContainerBuilder builder) 
     { 
      ... 

      builder.RegisterType<PayrollCenterReportsClientService>().As<IDataService<PayrollCenterReports>>(); 

      ... 
     } 
    }

，并在全球注册serivce。 ASAX我用我的初始化：

var builder = new ContainerBuilder(); 
new MenaAutofacInitializer().Initialize(builder); 
var container = builder.Build(); 

GlobalConfiguration.Configuration.DependencyResolver = new AutofacWebApiDependencyResolver(container); 

DependencyResolver.SetResolver(new AutofacDependencyResolver(container)); 

SiteMaps.Loader = container.Resolve<ISiteMapLoader>();

但在页我得到错误：

An error has occurred. An error occurred when trying to create a controller of type 'PayrollCenterReportsController'. Make sure that the controller has a parameterless public constructor. System.InvalidOperationException at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType) at System.Web.Http.Controllers.HttpControllerDescriptor.CreateController(HttpRequestMessage request) at System.Web.Http.Dispatcher.HttpControllerDispatcher.d__1.MoveNext() An error has occurred. Type 'LK.Reports.Services.WebApi.Module.Controllers.PayrollCenterReportsController' does not have a default constructor System.ArgumentException 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)

只有这样，才能解决这个问题是使用组装与控制器明确：

var a = typeof (PayrollCenterReportsController)

有了这个代码Autofac依赖的决心和所有的罚款。

装载组件

assembly = Assembly.Load("LK.Reports.Services.WebApi.Module, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null");

没有帮助

有什么办法解决它，而不在Global.asax中explitly使用typeof（PayrollCenterReportsController）？

来源

2015-10-20 Timur Lemeshko

如果你想避免明确注册你的控制器，你可以使用RegisterControllers方法

builder.RegisterControllers(typeof(MvcApplication).Assembly);

这可能需要一个以上的组件：

builder.RegisterControllers(AppDomain.CurrentDomain.GetAssemblies());

您可以在文档中找到更多的信息：Register Controllers

顺便说一句，而不是你自定义的IAutofacIntitializer接口，我推荐使用IModule。请参阅documentation以获取更多信息

来源

2015-10-20 15:29:44

我刚刚在将OData转换为MVC5项目的过程中遇到了类似的错误。下面的步骤帮助我得到它运行起来：

使用Autofac.WebApi2 NuGet包，而不是Autofac.WebApi包。（并且在添加WebApi2之前卸载Autofac.WebApi，这将使您无需手动将WebApi2添加到引用中。）
在Global.asax.cs中添加对WebApi2扩展的引用（或无论您在哪里旋转Autofac）与using Autofac.Integration.WebApi;
MVC和WebApi使用单独的DI框架。对于MVC，请用builder.RegisterControllers注册您的控制器。对于WebApi2（OData）使用builder.RegisterApiControllers。
最后，设置你的DI解析器，一个MVC和一个用于WebApi2：

DependencyResolver.SetResolver(new AutofacDependencyResolver(container)); // MVC

GlobalConfiguration.Configuration.DependencyResolver = new AutofacWebApiDependencyResolver(container); // WebApi2

来源

2017-02-20 22:00:30

用autofac解析控制器时的依赖性错误

回答

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