Data caching per request in Owin application

问题:

In traditional ASP.NET applications (that use System.Web), I'm able to cache data in

HttpContext.Current.Items 

Now in Owin the HttpContext is not available anymore. Is there a way to do the similar thing in Owin - a static method/property through which I can set/get per request data?

This question gave some hints but not exact a solution in my case.

回答1:

Finally I found OwinRequestScopeContext. Very simple to use.

In the Startup class:

app.UseRequestScopeContext();

Then I can add per request cache like this:

OwinRequestScopeContext.Current.Items["myclient"] = new Client();

Then anywhere in my code I can do (just like HttpContext.Current):

var currentClient = OwinRequestScopeContext.Current.Items["myclient"] as Client;

Here is the source code if you're curious. It uses CallContext.LogicalGetData and LogicalSetData. Does any one see any problem with this approach of caching request data?

回答2:

You just need to use OwinContext for this:

From your middleware:

public class HelloWorldMiddleware : OwinMiddleware
{
   public HelloWorldMiddleware (OwinMiddleware next) : base(next) { }

   public override async Task Invoke(IOwinContext context)
   {   
       context.Set("Hello", "World");
       await Next.Invoke(context);     
   }   
}

From MVC or WebApi:

Request.GetOwinContext().Get<string>("Hello");