如何从Owin管道中获取ApplicationDbContext [英] How to get ApplicationDbContext out of the Owin pipeline

问题描述

这必须很简单，但是我很难找到答案.控制器动作如何获得对保存在Owin管道中的每个请求的ApplicationDbContext的引用?

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?

好的，我想我越来越近了……也许不是……我所有的谷歌搜索似乎都导致了

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>();

其中上下文显然是Microsoft.Owin.IOwinContext的实例.所以我尝试了:

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

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

但是Get<T>方法需要一个string key参数. :(

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

推荐答案

答案(显然)是... 您需要添加using语句才能使其正常工作:

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

using Microsoft.AspNet.Identity.Owin;

因此，完整的示例如下:

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();
    }
}

这篇关于如何从Owin管道中获取ApplicationDbContext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IT屋！