Question

Is there any way to set the view file name as an attribute on top of Action ?

ex:

[ViewName("~/Views/CustomerInformation.cshtml")]
public ActionResult ViewCustomers()
{
    // 
}

purpose is to change the view file dynamically at run time.

Answer 1

Of course, you could override the OnActionExecuted method and replace the original view name that was used by the one specified in the action filter:

public class ViewNameAttribute : ActionFilterAttribute
{
    private readonly string _viewName;
    public ViewNameAttribute(string viewName)
    {
        _viewName = viewName;
    }

    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        var result = filterContext.Result as ViewResultBase;
        if (result != null)
        {
            result.ViewName = _viewName;
        }
    }
}

and then you could just return a dummy view:

[ViewName("~/Views/CustomerInformation.cshtml")]
public ActionResult ViewCustomers()
{
    return View();
}

But I wonder what the practical application of your custom action filter is when you could directly write:

public ActionResult ViewCustomers()
{
    return View("~/Views/CustomerInformation.cshtml");
}

You doesn’t seem to be bringing much value with this custom action filter to what the framework already provides.