Data caching per request in Owin application

Question

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.

score 18 · Accepted Answer · edited Apr 21 '17 at 17:23

18

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?

edited Apr 21 '17 at 17:23

hbulens

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answered Jan 30 '15 at 18:40

Calvin

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I up-voted this answer because; it is a new approach I was unaware of. I've always used [DalSoft](http://stackoverflow.com/users/324497/dalsoft)'s approach. Does anyone know the difference between the two? This approach seems more **global** while DalSoft's seems a bit more **local**, but I'm still not certain of the difference. – Chef_Code Mar 25 '16 at 20:40
1

OwinRequestScopeContext.Current is null always. Please help. – Kumar Sep 26 '16 at 07:15
In startup.cs, call app.UseRequestScopeContext() before you enable WebApi - or put it at the very top. – Calvin Jan 07 '17 at 00:15

DalSoft · Answer 2 · 2015-08-24T10:38:22.103

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");

Data caching per request in Owin application

2 Answers2

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