Executing code before a controller's method is invoked?

Question

Is it possible to make an action filter or something that runs before the action method itself runs on the controller?

I need this to analyze a few values in the request before the action runs.

score 13 · Accepted Answer · answered Feb 27 '12 at 09:38

13

You can override OnActionExecuting method in controller class

protected override void OnActionExecuting(ActionExecutingContext filterContext)
{
        base.OnActionExecuting(filterContext);
//Your logic is here...
}

answered Feb 27 '12 at 09:38

Ivan Manzhos

743
6
12

http://stackoverflow.com/questions/1337907/how-to-wire-common-code-from-a-base-controller-in-asp-net-mvc – Artem Koshelev Feb 27 '12 at 09:39
And what if I need to do it for all my controllers at once with a single code fragment? – Mathias Lykkegaard Lorenzen Feb 27 '12 at 09:40
Create a base class for all your controllers, as it's described in Artem's comment – Ivan Manzhos Feb 27 '12 at 09:42
You can use AOP (e.g. PostSharp or similar). – Andrea Colleoni Feb 27 '12 at 09:43
@Mathias Also you can hook up to the `Application_*` event handlers in global.asax. – oleksii Feb 27 '12 at 09:44

score 5 · Answer 2 · answered Feb 27 '12 at 10:03

You could use an attribute:

public class MyFilterAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        // Your logic here...

        base.OnActionExecuting(filterContext);
    }
}

And if you want to apply it to all controllers, in your Global.asax.cs:

public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
    filters.Add(new MyFilterAttribute());
}

protected void Application_Start()
{
    // Other code removed for clarity of this example...

    RegisterGlobalFilters(GlobalFilters.Filters);
    RegisterRoutes(RouteTable.Routes);

    // Other code removed for clarity of this example...
}

score 0 · Answer 3 · answered Feb 27 '12 at 09:51

0

If u don't want to use a base controller u can also add a own HttpHandler and register it in the web.config. In the BeginProcessRequest method u can analyse the values.

answered Feb 27 '12 at 09:51

rfcdejong

2,219
1
25
51

Executing code before a controller's method is invoked?

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