如何使用Ninject引导程序中的WebAPI OwinHost启动？ [英] How to use Ninject bootstrapper in WebApi OwinHost Startup?

问题描述

我从IIS的WebAPI迁移到OwinHost。利用的NuGet包的最新pre-发布版本，我成功地使用说明操作：

I am migrating from IIS WebAPI to OwinHost. Utilizing the latest pre-release versions of nuget packages, I successfully used instructions here:

<一个href=\"https://github.com/ninject/Ninject.Web.Common/wiki/Setting-up-a-OWIN-WebApi-application\">https://github.com/ninject/Ninject.Web.Common/wiki/Setting-up-a-OWIN-WebApi-application

下面是我的code的存根：

Here is stub of my code:

    public void Configuration(IAppBuilder app)
    {
        var config = new HttpConfiguration();
        config.MapHttpAttributeRoutes();

        app.UseNinjectMiddleware(CreateKernel);
        app.UseNinjectWebApi(config);
    }

    private static StandardKernel CreateKernel()
    {
        var kernel = new StandardKernel();
        kernel.Load(Assembly.GetExecutingAssembly());
        RegisterServices(kernel);
        return kernel;
    }

    private static void RegisterServices(IKernel kernel)
    {
        ...
    }

但在我的code和文件的例子，直到启动后未创建Ninject内核。我需要Ninject DI，然而，在用于一个Cors和OAuth中间件登记启动注册过程。迁移到OwinHost之前，我可以做这样的事情：

But in my code and the documentation example, the Ninject kernel is not created until after Startup. I need Ninject DI, however, in the Startup registration process for Cors and OAuth middleware registration. Before migrating to OwinHost, I could do something like this:

public void Configuration(IAppBuilder app)
{
  _bootstrapper = new Bootstrapper();
  _bootstrapper.Initialize(CreateKernel);           

  var config = new HttpConfiguration();
  config.MapHttpAttributeRoutes();

  // USE _boostrapper.Kernel here

  app.UseNinjectMiddleware(CreateKernel);
  app.UseNinjectWebApi(config);
}

但在内部，OwinBootstrapper.Execute最终会调用CreateKernel和bootstrapper.Initialize第二次，用不好的后果。

But internally, OwinBootstrapper.Execute will end up calling CreateKernel and bootstrapper.Initialize a second time, with bad consequences.

什么是创建和启动内使用ninject内核，仍然注册Ninject /中间件的WebAPI正确的方式？

What is the right way to create and use the ninject kernel within Startup and still register the Ninject/WebAPI middleware?

推荐答案

以下的NuGet的程序包添加到应用程序：

Add the following nuget-packages to your application:

1. 安装封装Microsoft.AspNet.WebApi.Owin


2. 安装封装Ninject

如果您正在使用Web API版本5.0.0.0你还需要下载<一个href=\"https://github.com/WebApiContrib/WebApiContrib.IoC.Ninject/blob/master/src/WebApiContrib.IoC.Ninject/NinjectResolver.cs\">Ninject从回购解析器类以避免兼容性问题。

If you are using web api version 5.0.0.0 you also need to download the Ninject Resolver class from the repo to avoid compatability issues.

创建一个返回内核对象的静态方法

Create a static method that returns a Kernel object

public static class NinjectConfig
{
    public static IKernel CreateKernel()
    {
        var kernel = new StandardKernel();
        //Create the bindings
        kernel.Bind<IProductsRepository>().To<ProductRepository>();
        return kernel;
    }
}

然后你就可以在你的启动类使用ninject

Then you can use ninject in your startup class

public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        var config = new HttpConfiguration();
        config.DependencyResolver = new NinjectResolver(NinjectConfig.CreateKernel());

        config.Routes.MapHttpRoute("default", "api/{controller}/{id}", new { id=RouteParameter.Optional });

        app.UseWebApi(config);
    }
}

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