CODEWITHSUNDEEP
c#asp.net-mvcasp.net-core
vfabre
vfabre

Reputation: 1408

aspnet vNext ActionFilter and TempData

I'm trying to create an ActionFilter in aspnet vNext. Within this filter I want to access to the TempData and the ViewData (both available in Controller in previous versions).I override the method public override void OnActionExecuting(ActionExecutingContext filterContext)

Into the filterContext I have the controller but is an object instead of ControllerBase. I was expected a ControllerBase because in previous versions of MVC the ControllerContext (the base class of ActionExecutingContext) was a ControllerBase, here is the source code in codeplex. I understand that this could be because the POCO controllers.

So, the question is, how can access to the TempData and the ViewData if the controller is an object. Simply doing a downcasting (something like this (Controller)filterContext.Controller) or there's a best way to do it.

Update

That I want to achieve if explain it in this blog post but with aspnet 5.

Upvotes: 6

Views: 2797

Answers (1)

Kiran
Kiran

Reputation: 57949

To access TempData from within an action filter, you can get the service called ITempDataDictionary from DI.

To get this service from DI, you could either do something like actionContext.HttpContext.RequestServices.GetRequiredService<ITempDataDictionary>() from within your OnActionExecuting method. You could also use construction inject if you like by using ServiceFilterAttribute.

NOTE:
TempData by default depends on Session feature(i.e TempData's data is stored in Session) and so you need to few things to get it working.

  • Reference Microsoft.AspNet.Session and Microsoft.Framework.Caching.Memory packages.

  • In your ConfigureServices method, do the following:

    services.AddCaching();
services.AddSession();

  • In your Configure method, register the Session middleware (this is the one which creates/attaches a session to the incoming requests) and do it before registering MVC.

    app.UseSession();
app.UseMvc(...)

Upvotes: 6

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