DependencyResolver + Owin + WebApi2

Question

Owin的最大优点之一是它不依赖System.Web。如果WebApi显然需要这样的内容，那么我到底该如何设置DI：

var config = new HttpConfiguration();
var container = new WindsorContainer().Install(new ControllerInstaller());
container.Install(FromAssembly.This());
config.DependencyResolver = ...

其中config.DependencyResolver需要一个来自System.Web.Http.Dependencies的具体的IDependencyResolver

我特别感兴趣的是C#代码，它使用了WebApi + Owin + Castle.Windsor (谷歌对此帮助不大)。

Answer 1

我已经设法让它使用了：

[assembly: OwinStartup(typeof(Bla.Startup))]
namespace Bla
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            //...  
            var container = new WindsorContainer().Install(new ControllerInstaller());
        var httpDependencyResolver = new WindsorHttpDependencyResolver(container);
            config.DependencyResolver = httpDependencyResolver;
            //...
        }
}

public class ControllerInstaller : IWindsorInstaller
{
    public void Install(IWindsorContainer container, IConfigurationStore store)
    {
        container.Register(AllTypes.FromThisAssembly()
        .Pick().If(t => t.Name.EndsWith("Controller"))
        .Configure(configurer => configurer.Named(configurer.Implementation.Name))
        .LifestylePerWebRequest());

        //...
    }
}

internal class WindsorDependencyScope : IDependencyScope
{
    private readonly IWindsorContainer _container;
    private readonly IDisposable _scope;

    public WindsorDependencyScope(IWindsorContainer container)
    {
        if (container == null)
        {
        throw new ArgumentNullException("container");
        }

        _container = container;
        _scope = container.BeginScope();
    }

    public object GetService(Type t)
    {
        return _container.Kernel.HasComponent(t)
        ? _container.Resolve(t) : null;
    }

    public IEnumerable<object> GetServices(Type t)
    {
        return _container.ResolveAll(t)
        .Cast<object>().ToArray();
    }

    public void Dispose()
    {
        _scope.Dispose();
    }
}

internal sealed class WindsorHttpDependencyResolver : IDependencyResolver
{
    private readonly IWindsorContainer _container;

    public WindsorHttpDependencyResolver(IWindsorContainer container)
    {
        if (container == null)
        {
        throw new ArgumentNullException("container");
        }

        _container = container;
    }

    public object GetService(Type t)
    {
        return _container.Kernel.HasComponent(t)
         ? _container.Resolve(t) : null;
    }

    public IEnumerable<object> GetServices(Type t)
    {
        return _container.ResolveAll(t)
        .Cast<object>().ToArray();
    }

    public IDependencyScope BeginScope()
    {
        return new WindsorDependencyScope(_container);
    }

    public void Dispose()
    {
    }
}

我所面临的问题是使用：

config.DependencyResolver = httpDependencyResolver;

引入对system.web的依赖关系。因此，当我试图在一些整数测试中使用owin时，我会遇到一些问题。我会提出另一个问题。

Answer 2

看看这里- “Mark在ASP.NET Web中的依赖注入与城堡温莎”。然后在马克·西曼的博客档案。他讲了很多关于DI和WEB的内容，并且经常使用。我打赌城堡温莎是他最喜欢的DI容器。当您查看存档时，不要只查看WEB。有时，他在不同标题下发布关于WEB的文章。

如果你读了他那本好书，你就会对IoC/DI这个话题有很好的理解。很好的书。