问题描述
我需要构建一个 Owin 中间件对象,但不能从 Startup
类中构建.我需要从代码中的任何其他地方构建它,因此我需要引用应用程序的 AppBuilder
实例.有没有办法从其他地方得到它?
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
您可以简单地将 AppBuilder
自身注入 OwinContext
.但是由于 Owin 上下文只支持 IDisposable
对象,所以将其包裹在 IDisposable
对象中并注册.
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
}
}
因此,您可以在代码的任何地方访问 IAppBuilder
对象.
So in everywhere of your code you have access IAppBuilder
object.
public class FooController : Controller
{
public ActionResult BarAction()
{
var app = HttpContext.Current.GetOwinContext().Get<AppBuilderProvider>().Get();
// rest of your code.
}
}
这篇关于如何在我的 ASP.NET MVC 5.2.3 应用程序中的其他地方获取 IAppBuilder 的实例?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!