Ninject + MVC3 = InvalidOperationException:序列不包含任何元素 [英] Ninject + MVC3 = InvalidOperationException: Sequence contains no elements

问题描述

我创建了一个新的 MVC3 项目，按 F5，看到示例页面.

I created a new MVC3 project, hit F5, saw the sample page.

然后我使用 NuGet 来获取 Ninject.MVC 扩展.我根据 Ninject 文档修改了我的 global.asax，如何设置 MVC3 应用程序:

Then I used NuGet to get the Ninject.MVC extension. I modified my global.asax according to the Ninject documentation, How To Setup an MVC3 Application:

public class MvcApplication : NinjectHttpApplication
{
   public static void RegisterGlobalFilters(GlobalFilterCollection filters)
   {
       filters.Add(new HandleErrorAttribute());
   }

   public static void RegisterRoutes(RouteCollection routes)
   {
       routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

       routes.MapRoute(
           "Default", // Route name
           "{controller}/{action}/{id}", // URL with parameters
           new { controller = "Home", action = "Index", 
               id = UrlParameter.Optional });
   }

   protected override IKernel CreateKernel()
   {
       var kernel = new StandardKernel();
       kernel.Load(Assembly.GetExecutingAssembly());
       return kernel;
   }

   protected override void OnApplicationStarted()
   {
       base.OnApplicationStarted();

       AreaRegistration.RegisterAllAreas();
       RegisterGlobalFilters(GlobalFilters.Filters);
       RegisterRoutes(RouteTable.Routes);
   }
}

现在，当我运行该应用程序时，出现黄屏死机，但有以下异常:

Now when I run the app, I get the yellow screen of death with the following exception:

InvalidOperationException - 序列不包含任何元素.

InvalidOperationException - Sequence contains no elements.

在 System.Linq.Enumerable.Single(...)

at System.Linq.Enumerable.Single(...)

在 Ninject.Web.Mvc.Bootstrapper.Initialize(...)第 67 行.

at Ninject.Web.Mvc.Bootstrapper.Initialize(...) line 67.

果然，该文件的第 67 行 调用 .Single()，从而抛出异常.

And sure enough, line 67 of that file calls .Single(), thus throwing the exception.

我做错了什么?

推荐答案

您可能会注意到，在安装 ninject.mvc3 NuGet 后，在您的内部创建了一个 App_Start 子文件夹包含 NinjectMVC3.cs 文件的项目.删除此文件夹并重试.所以这是我遵循的步骤:

You might notice that after installing the ninject.mvc3 NuGet there is an App_Start subfolder created inside your project containing an NinjectMVC3.cs file. Delete this folder and try again. So here are the steps I followed:

1. 使用默认模板创建一个新的 ASP.NET MVC 3 项目
2. 打开包管理器控制台窗口(查看 -> 其他窗口 -> 包管理器控制台)
3. 在命令行输入 install-package ninject.mvc3
4. 将 Global.asax 中的默认代码替换为您问题中的代码
5. 删除在安装包期间创建的 AppStart 子文件夹
6. 运行应用程序
7. 享受在 Google Chrome 网络浏览器中打开的 /Home/Index 默认页面的美妙之处:-)

1. Create a new ASP.NET MVC 3 project using the default template
2. Bring up the Package Manager Console window (View -> Other Windows -> Package Manager Console)
3. Type install-package ninject.mvc3 on the command line
4. Replace the default code in Global.asax with the code in your question
5. Delete the AppStart subfolder created during the installation of the package
6. Run the application
7. Enjoy the beauty of the /Home/Index default page opened in your Google Chrome web browser :-)

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