How to get ApplicationDbContext out of the Owin pipeline

问题

This has to be simple, but I'm going bug-eyed trying to find the answer. How does a controller action get a reference to the per-request ApplicationDbContext that was stashed in the Owin pipeline?

EDIT: Ok, I think I'm getting closer... or maybe not... All of my Googling seems to lead to this blog post, which sez to use:

var dbContext = context.Get<ApplicationDbContext>();

where context is apparently an instance of Microsoft.Owin.IOwinContext. So I tried:

var db = HttpContext.GetOwinContext().Get<ApplicationDbContext>();

But the Get<T> method requires a string key parameter. :(

回答1:

And the answer (apparently) is... You need to add this using statement to get it to work:

using Microsoft.AspNet.Identity.Owin;

so a complete example would look like:

using Microsoft.AspNet.Identity.Owin;

public class HomeController : Controller
{
    public ActionResult Index()
    {
        var context = HttpContext.GetOwinContext().Get<ApplicationDbContext>();
        DoSomething(context); // Use the context object; do not dispose it!

        return View();
    }
}

来源：https://stackoverflow.com/questions/23881489/how-to-get-applicationdbcontext-out-of-the-owin-pipeline