#RTCEUR Wish #1 – Push parameter from Host to Hosted

@Jbenoit44 suggested a tool to push a param from any Host (inc. Lev. and ref pl.) to any Hosted & reverse. Doors windows face base fam Parts etc

This implementation drives parameters from Hosts to their Family Instances.

public void ParametersFromHost()
{
    Document doc = this.ActiveUIDocument.Document;

    ElementCategoryFilter hostFilter = new ElementCategoryFilter(BuiltInCategory.OST_Walls);
    ElementCategoryFilter hostedFilter = new ElementCategoryFilter(BuiltInCategory.OST_Doors);

    string parameterName = "Rating";

    using (Transaction t = new Transaction(doc, "Set hosted parameters"))
    {
        t.Start();
        foreach (Element host in new FilteredElementCollector(doc).WherePasses(hostFilter))
        {
            Parameter paramHost = host.get_Parameter(parameterName);

            foreach (Element hosted in new FilteredElementCollector(doc)
                     .WherePasses(hostedFilter)
                     .OfClass(typeof(FamilyInstance))
                     .Cast<FamilyInstance>()
                     .Where(q => q.Host.Id == host.Id))
            {
                if (paramHost.StorageType == StorageType.String)
                    hosted.get_Parameter(parameterName).Set(paramHost.AsString());
                else if (paramHost.StorageType == StorageType.Double)
                    hosted.get_Parameter(parameterName).Set(paramHost.AsDouble());
                else if (paramHost.StorageType == StorageType.Integer)
                    hosted.get_Parameter(parameterName).Set(paramHost.AsInteger());
            }
        }
        t.Commit();
    }
}