Developer forum

What I wanted to do is that some productgroups should by default be filtered on a condition unless a certain other filter is used. 

The solution was to use Ecommerce.Querying.BeforeQuery. 

The you can for example check and manipulate the parameters with notificationArgs.Settings.Parameters. 

So I could check for come conditions and the add a parameter if none the conditions were true. Nice. 

        public override void OnNotify(string notification, NotificationArgs args)
        {
            
            if (!(args is Ecommerce.Querying.BeforeQueryArgs))
                return;

            var notificationArgs = (Ecommerce.Querying.BeforeQueryArgs)args;

            var groupId = !string.IsNullOrEmpty(HttpContext.Current.Request["GroupID"]) ? HttpContext.Current.Request.QueryString.Get("GroupID") : "";
            var currentEcomGroup = Dynamicweb.Ecommerce.Services.ProductGroups.GetGroup(groupId);
            var mainProductListing = Convert.ToBoolean(currentEcomGroup.ProductGroupFieldValues.GetProductGroupFieldValue("MainProductListing").Value);

            if (currentEcomGroup.HasChildGroups && !mainProductListing) return;

            if (notificationArgs.Settings.Parameters.Keys.Contains("Color")) return;

            notificationArgs.Settings.Parameters.Add("MP", true);
                   
        }

Regards /Aki