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c# - Asp.net mvc - Accessing view Model from a custom Action filter

I am trying to access the Model data passed to the view in the action filter OnActionExecuted. Does anyone know if this is possible?

I am trying to do something like this:

public override void OnActionExecuted(ActionExecutedContext filterContext)
{
    //get model data
    //...

    sitemap.SetCurrentNode(model.Name);
}

Any advice?

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The model is at:

filterContext.Controller.ViewData.Model

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