Run controller code once per page in ASP.NET MVC

Question

I set a property in the base controller so that I can have access to its value from every action. Originally I put code to get the value (from a cookie) in the OnActionExecuting method, which works, but then I realized it's going to get called on every action call (some pages may run it hundreds of times because of repeating partial views). How could I do it so it's only called once per page?

I looked at a similar answered question... How to call a function *only once* in ASP.NET MVC page cycle but the answer only deals with Ajax requests, which is not my problem.

What do you mean by "once per page"? You do realize that a new controller instance is [generally] created each time a GET or POST request is made, don't you? You could use a static property, but that will be invoked once per app domain. To set it once per user session, consider using a session state variable. — Nicholas Carey
– Nicholas Carey, Commented Oct 28, 2013 at 19:59

Spock · Accepted Answer · 2013-10-28 19:50:46Z

1

Similar to @philsandler mentioned you can use the same solution. BUT I would still use an Action Filter to make it reusable and contained. Something like below.

public class RunOnlyPerAction : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext) {
        if (!filterContext.HttpContext.Request.IsAjaxRequest())
        {
            //read cookie
        }
    }
}


 [RunOnlyPerAction]
 public ActionResult Index()
 {
     return View();
 }

answered Oct 28, 2013 at 19:50

Spock

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3 Comments

Rodolfo Over a year ago

but it's not an ajax request, I have pages that contain partial views and they're displayed on the 'parent' view with a @html.action(xxx) for example.

Rodolfo Over a year ago

I think my question didn't make much sense now that I'm reading it again. I'm thinking I could do what I want with an action filter so marking this as answer.

Michael R Over a year ago

Is this related? stackoverflow.com/questions/28078534/…

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