ASP.NET MVC ActionFilter parameter binding

Question

If you have a model-bound parameter in an action method, how can you get to that parameter in an action filter?

[MyActionFilter]
public ActionResult Edit(Car myCar)
{
    ...
}

public class MyActionFilterAttribute : ActionFilterAttribute
{
    public void OnActionExecuted(ActionExecutedContext filterContext)
    {
        //I want to access myCar here
    }

}

Is there anyway to get myCar without going through the Form variables?

Here is a great article explaining how to access ActionParameters for authorization purposes: joe-stevens.com/2010/08/19/… — Michael La Voie
– Michael La Voie, Commented Apr 17, 2013 at 18:05

eu-ge-ne · Accepted Answer · 2009-12-25 16:43:58Z

12

Not sure about OnActionExecuted but you can do it in OnActionExecuting:

public class MyActionFilterAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        // I want to access myCar here

        if(filterContext.ActionParameters.ContainsKey("myCar"))
        {
            var myCar = filterContext.ActionParameters["myCar"] as Car;

            if(myCar != null)
            {
                // You can access myCar here
            }
        }
    }
}

edited Dec 25, 2009 at 16:43

answered Dec 25, 2009 at 16:28

eu-ge-ne

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4 Comments

Yuriy Faktorovich Over a year ago

I don't think you can use ActionFilter there, it is ActionFilterAttribute. Also where did you get the ActionParameters property on the ActionExecutedContext?

eu-ge-ne Over a year ago

Thanks, it is ActionFilterAttribute - you are right. I have not noticed that the question is about OnActionExecuted.

Shlomo Over a year ago

Thanks guys. Edited my original question to state ActionFilterAttribute.

Dean Martin Over a year ago

Great answer however "if(filterContext.ActionParameters["myCar"] is Car) filterContext.ActionParameters["myCar"] as Car" is a little better.

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