针对IHttpModule的InRequestScope ObjectContext

Question

我正在通过添加IHttpModule使用cookie进行登录。该模块依赖于我的DbContext，它在Ninject配置中被设置为InRequestScope。但是，尽管我在SendAsync实现中使用了(MyContext)DependencyResolver.Current.GetService(typeof(MyContext));，但HTTP模块似乎获得了与请求的其余代码不同的DbContext。

Answer 1

你需要使用ninject的web通用扩展名和webapi扩展名。在我们的代码中，它看起来像下面这样，即使使用Ctor注入也可以工作：

public static class NinjectWebCommon 
{
    private static readonly Bootstrapper bootstrapper = new Bootstrapper();

    public static void Start()
    {
        ConfigureLogger();

        DynamicModuleUtility.RegisterModule(typeof(OnePerRequestHttpModule));
        DynamicModuleUtility.RegisterModule(typeof(NinjectHttpModule));
        bootstrapper.Initialize(CreateKernel);
    }

    public static void Stop()
    {
        bootstrapper.ShutDown();
    }


    private static IKernel CreateKernel()
    {
        var kernel = new StandardKernel();
        RegisterServices(kernel);

        kernel.Bind<Func<IKernel>>().ToMethod(ctx => () => new Bootstrapper().Kernel);
        kernel.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>();
        kernel.Bind<IHttpModule>().To<AuthenticationHttpModule>();

        return kernel;
    }

    private static void RegisterServices(IKernel kernel)
    {
        kernel.Load(Assembly.GetExecutingAssembly());
    }
}

例如，我们的自定义模块

public class AuthenticationHttpModule : IHttpModule
{
    private readonly IAuthenticationVerifier authenticateVerify;

    public AuthenticationHttpModule(IAuthenticationVerifier authenticateVerify)
    {
        this.authenticateVerify = authenticateVerify;
    }

    public void Dispose()
    {
    }

    public void Init(HttpApplication application)
    {
        application.AuthenticateRequest += this.OnAuthenticateRequest;
        application.EndRequest += this.OnEndRequest;
    }

    private void OnAuthenticateRequest(object source, EventArgs eventArgs)
    {
        var app = (HttpApplication)source;

        try
        {
            var user = this.authenticateVerify.DoAuthentication(app.Request);

            app.Context.User = user;
        }
        catch (InvalidCredentialException)
        {
            this.DenyAccess(app);
        }
    }

    private void OnEndRequest(object source, EventArgs eventArgs)
    {
        ...
    }

}