Understanding ASP.NET MVC Lifecycle: Why is Model not available in ActionFilter?[Answered] RSS

• • Reply
  HoomanBahrei...

  Member

  2 Points

  4 Posts

  Understanding ASP.NET MVC Lifecycle: Why is Model not available in ActionFilter?

  May 11, 2020 07:11 AM|HoomanBahreini|LINK

  I have created the following Custom Action Filter, when I try to access the Model in the following code, it is null:

  public class CustomPermissionCheckAttribute : ActionFilterAttribute
  {
      public override void OnActionExecuting(ActionExecutingContext context)
      {
          OrganisationBaseController orgBaseController = context.Controller as Controller;
          MyViewModel m = ((Controller)context.Controller).ViewData.Model as MyViewModel; // null
  
          // check if current user has permission to m.OrganisationId
  
          base.OnActionExecuting(context);
      }
  }

  I am trying to understand why the Model is null? According to ASP.NET MVC Pipeline, Action Filters are executed after Model Binding, so I am not sure why the Model is not available?

  This is how I am register the above Action Filter:

  [HttpPost]
  [CustomPermissionCheck]
  public ActionResult UpdateBranch(MyViewModel myViewModel)
  {
      if (ModelState.IsValid)
      {
          // do something...
      }
      return View();
  }

• • Reply
  bruce (sqlwo...

  All-Star

  58204 Points

  15661 Posts

  Re: Understanding ASP.NET MVC Lifecycle: Why is Model not available in ActionFilter?

  May 11, 2020 02:18 PM|bruce (sqlwork.com)|LINK

  The viewdata.model, is set when the viewcontext is setup via

      return View(viewModel)

  bruce (sqlwork.com)
• • Reply
  YihuiSun

  Contributor

  2750 Points

  781 Posts

  Re: Understanding ASP.NET MVC Lifecycle: Why is Model not available in ActionFilter?

  May 12, 2020 09:39 AM|YihuiSun|LINK

  Hi,  HoomanBahreini

  You can get your model in the following way.

  MyViewModel m = context.ActionParameters.Values.SingleOrDefault() as MyViewModel;

  Here is the result.

  

  Best Regards,

  YihuiSun
   

  .NET forums are moving to a new home on Microsoft Q&A, we encourage you to go to Microsoft Q&A for .NET for posting new questions and get involved today.
• • Reply
  HoomanBahrei...

  Member

  2 Points

  4 Posts

  Re: Understanding ASP.NET MVC Lifecycle: Why is Model not available in ActionFilter?

  May 14, 2020 07:22 AM|HoomanBahreini|LINK

  Thanks a lot,