ASP.NET5中如何使用基于IAppBuilder的Owin中间件

Question

ASP.NET 5 (aspnet vnext) 与 Katana 一样基于 OWIN，但具有不同的抽象。值得注意的是 IAppBuilder 已被 IApplicationBuilder 取代。许多中间件库依赖于 IAppBuilder 并且尚未更新以支持 ASP.NET 5

如何在 APS.NET 5 中间件中使用这个 OWIN 中间件。两者都是基于 OWIN 的，因此应该是可能的。

Microsoft.AspNet.Builder.OwinExtensions 确实提供了 UseOwin 方法，但它基于低级 OWIN 签名，因此不能与期望 IAppBuilder.

的方法一起使用

Answer 1

框架兼容的经常被引用的参考文献是 an extension method build by Thinktecture for supporting their IdentityServer3 on ASP.NET 5。

该方法特定于 IdentityServer，不支持由稍后在 AspNet 管道中注册的任何中间件处理的请求（它不调用下一个组件）。

这调整了方法以解决这些缺点：

internal static class IApplicationBuilderExtensions
{
  public static void UseOwin(
    this IApplicationBuilder app,
    Action<IAppBuilder> owinConfiguration )
  {
    app.UseOwin(
      addToPipeline =>
        {
          addToPipeline(
            next =>
              {
                var builder = new AppBuilder();

                owinConfiguration( builder );

                builder.Run( ctx => next( ctx.Environment ) );

                Func<IDictionary<string, object>, Task> appFunc =
                  (Func<IDictionary<string, object>, Task>)
                  builder.Build( typeof( Func<IDictionary<string, object>, Task> ) );

                return appFunc;
              } );
        } );
  }
}

可以这样使用：

app.UseOwin(
    owin =>
        {
            // Arbitrary IAppBuilder registrations can be placed in this block

            // For example, this extension can be provided by
            // NWebsec.Owin or Thinktecture.IdentityServer3
            owin.UseHsts();
        } );

// ASP.NET 5 components, like MVC 6, will still process the request
// (assuming the request was not handled by earlier middleware)
app.UseMvc();

Answer 2

编辑：您现在可以使用 AspNet.Hosting.Katana.Extensions package。

这是一个略有不同的版本，它使用 AppBuilder.DefaultApp:

public static IApplicationBuilder UseOwinAppBuilder(this IApplicationBuilder app, Action<IAppBuilder> configuration)
{
    if (app == null)
    {
        throw new ArgumentNullException(nameof(app));
    }

    if (configuration == null)
    {
        throw new ArgumentNullException(nameof(configuration));
    }

    return app.UseOwin(setup => setup(next =>
    {
        var builder = new AppBuilder();
        var lifetime = (IApplicationLifetime) app.ApplicationServices.GetService(typeof(IApplicationLifetime));

        var properties = new AppProperties(builder.Properties);
        properties.AppName = app.ApplicationServices.GetApplicationUniqueIdentifier();
        properties.OnAppDisposing = lifetime.ApplicationStopping;
        properties.DefaultApp = next;

        configuration(builder);

        return builder.Build<Func<IDictionary<string, object>, Task>>();
    }));
}

请注意，引用 Microsoft.Owin 会使您的应用与 dnxcore50 (Core CLR) 不兼容。

ASP.NET5中如何使用基于IAppBuilder的Owin中间件

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