如何在我的ASP.NET MVC应用程序5.2.3其他地方得到IAppBuilder的实例？ [英] How do I get an instance of IAppBuilder elsewhere in my ASP.NET MVC 5.2.3 application?

问题描述

我需要建立一个Owin中间件对象，但不是从启动类中。我需要从我的code别处内部建立，所以我需要在应用程序的的AppBuilder 实例的引用。是否有一种方式来获得从其他地方？

I need to build an Owin middle-ware object but not from within the Startup class. I need to build it from within anywhere else in my code, so I need a reference to the AppBuilder instance of the application. Is there a way to get that from anywhere else?

推荐答案

您可以简单地注入的AppBuilder 本身 OwinContext 。但由于Owin方面只支持的IDisposable 对象，把它包在的IDisposable 对象，并对其进行注册。

You could simply inject AppBuilder itself to OwinContext. But since Owin context only supports IDisposable object, wrap it in IDisposable object and register it.

public class AppBuilderProvider : IDisposable
{
    private IAppBuilder _app;
    public AppBuilderProvider(IAppBuilder app)
    {
        _app = app;
    }
    public IAppBuilder Get() { return _app; }
    public void Dispose(){}
}

public class Startup
{
    // the startup method
    public void Configure(IAppBuilder app)
    {
        app.CreatePerOwinContext(() => new AppBuilderProvider(app));
        // another context registrations
    }
}

所以在你到处code你有机会获得 IAppBuilder 对象。

public class FooController : Controller
{
    public ActionResult BarAction()
    {
        var app = HttpContext.GetOwinContext().Get<AppBuilderProvider>().Get();
        // rest of your code.        
    }
}

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