Xbim library does not find all properties

Question

We process ifc IFC2X3 file for retrieving information.

With the following code some properties seems not to be found. Its about "Typical-code" in "General" section

            //get one single object 
            var id = "2c$4fosk5BCvGtDFpkXAUc";

            var prd = _ifcModel.Instances
               .OfType<IIfcProduct>()
               .Where(ro => ro.GlobalId.Equals(id))
               .FirstOrDefault();

            //get all single-value properties of the door
            var properties = prd.IsDefinedBy
                .Where(r => r.RelatingPropertyDefinition is IIfcPropertySet)
                .SelectMany(r => ((IIfcPropertySet)r.RelatingPropertyDefinition).HasProperties)
                .OfType<IIfcPropertySingleValue>();

When I use another viewer like BIMcollab ZOOM or solibri bim360 then the particular "Typical-code" property is found.

Tried with example code to get the particular property from the model.

Answer 1

It turned out that also the IIfcRelDefinesByType should be checked

        var rdbt = _ifcModel.Instances
            .OfType<IIfcRelDefinesByType>()
            .ToList();

        var general_set_properties_type = rdbt
            .Where(bt => bt.RelatingType.HasPropertySets.Any(ps => ps.Name.Value.Equals("General")))
            .SelectMany(bt => bt.RelatedObjects.Select(bt1 => (bt1.GlobalId, bt.RelatingType)))
            .ToDictionary(
                k => k.GlobalId,
                v => v.RelatingType.HasPropertySets
                .Where(ps => ps.Name.Value.Equals("General"))
                .OfType<IIfcPropertySet>()
                .FirstOrDefault().HasProperties.ToList());