Access viewcontext from httpcontext

Question

I want to get ViewData value from httpcontext. My function:

[LogActionFilter]
public ActionResult Edit(int id = 0)
{
    var obj = getObjFromDb(id);
    ViewData["abc"] = obj.name;
    return View(obj);
}

My action filter where I want to to access ViewData value:

public class LogActionFilter : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        var a= filterContext.HttpContext.Items["abc"]; //null
        var b = filterContext.HttpContext.Request.RequestContext.HttpContext.Items["abc"]; //null
    }

    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        var a= filterContext.HttpContext.Items["abc"]; //null
        var b = filterContext.HttpContext.Request.RequestContext.HttpContext.Items["abc"]; //null
    }
}

How can I access the value of ViewData from HttpContext ?

Answer 1

You can use session to pass value into your OnActionExecuted filter. However you can't pass anything from your action to OnActionExecution because its executed before your action.

 [LogActionFilter]
  public ActionResult Edit(int id = 0)
  {
    var obj = getObjFromDb(id);
    Session["abc"] = obj.name;
    return View(obj);
  }

In filter:

public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        var a = filterContext.HttpContext.Session["abc"];
        /// a should have a value
    }

Answer 2

Thanks to Stephen Muecke,

ViewData is not available in HttpContext

So I changed my logic, instead of getting viewdata value, I fetched data from database in action filter.