owin-middleware/DotNetDoodle.Owin.Dependencies

An IoC container adapter into OWIN pipeline

DotNetDoodle.Owin.Dependencies

An IoC container adapter into OWIN pipeline

Install Through NuGet

Core package which includes the interfaces and common extensions:

PM> Install-Package DotNetDoodle.Owin.Dependencies -pre

Autofac IoC container implementation:

PM> Install-Package DotNetDoodle.Owin.Dependencies.Autofac -pre

ASP.NET Web API adapter:

PM> Install-Package DotNetDoodle.Owin.Dependencies.Adapters.WebApi -pre

Sample Snippet

Install the DotNetDoodle.Owin.Dependencies.Adapters.WebApi, DotNetDoodle.Owin.Dependencies.Autofac and Autofac.WebApi5 NuGet packages.

Startup.cs

public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        IContainer container = RegisterServices();
        HttpConfiguration config = new HttpConfiguration();
        config.Routes.MapHttpRoute("DefaultHttpRoute", "api/{controller}");

        app.UseAutofacContainer(container)
           .Use<RandomTextMiddleware>()
           .UseWebApiWithContainer(config);
    }

    public IContainer RegisterServices()
    {
        ContainerBuilder builder = new ContainerBuilder();

        builder.RegisterApiControllers(Assembly.GetExecutingAssembly());
        builder.RegisterOwinApplicationContainer();

        builder.RegisterType<Repository>()
               .As<IRepository>()
               .InstancePerLifetimeScope();

        return builder.Build();
    }
}

RandomTextMiddleware.cs

public class RandomTextMiddleware : OwinMiddleware
{
    public RandomTextMiddleware(OwinMiddleware next)
        : base(next)
    {
    }

    public override async Task Invoke(IOwinContext context)
    {
        IServiceProvider requestContainer = context.Environment.GetRequestContainer();
        IRepository repository = requestContainer.GetService(typeof(IRepository)) as IRepository;

        if (context.Request.Path == "/random")
        {
            await context.Response.WriteAsync(repository.GetRandomText());
        }
        else
        {
            context.Response.Headers.Add("X-Random-Sentence", new[] { repository.GetRandomText() });
            await Next.Invoke(context);
        }
    }
}

TextsController.cs

public class TextsController : ApiController
{
    private readonly IRepository _repo;

    public TextsController(IRepository repo)
    {
        _repo = repo;
    }

    public IEnumerable<string> Get()
    {
        return _repo.GetTexts();
    }
}