BuildingCoder.CmdCollectorPerformance.GetElementsMatchingParameter C# (CSharp) Метод

        static IList<Element> GetElementsMatchingParameter(
            Document doc,
            string paramName,
            string paramGroup,
            string paramValue)
        {
            IList<Element> elems = new List<Element>();

              // Determine if definition for parameter binding exists

              Definition definition = null;
              BindingMap bm = doc.ParameterBindings;
              DefinitionBindingMapIterator it = bm.ForwardIterator();
              while( it.MoveNext() )
              {
            Definition def = it.Key;
            if( def.Name.Equals( paramName ) )
            {
              definition = def;
              break;
            }
              }
              if( definition == null )
              {
            return elems; // parameter binding not defined
              }

              using( Transaction tx = new Transaction( doc ) )
              {
            tx.Start( "Set temporary parameter" );

            // Temporarily set project information element
            // parameter in order to determine param.Id

            FilteredElementCollector collectorPI
              = new FilteredElementCollector( doc );

            collectorPI.OfCategory(
              BuiltInCategory.OST_ProjectInformation );

            Element projInfoElem
              = collectorPI.FirstElement();

            // using http://thebuildingcoder.typepad.com/blog/2012/04/adding-a-category-to-a-shared-parameter-binding.html

            Parameter param = null;

            //param = HelperParams.GetOrCreateElemSharedParam(
            //     projInfoElem, paramName, paramGroup,
            //     ParameterType.Text, false, true );

            if( param != null )
            {
              ElementId paraId = param.Id;

              tx.RollBack(); // discard project element change

              ParameterValueProvider provider
            = new ParameterValueProvider( paraId );

              FilterRule rule = new FilterStringRule(
            provider, new FilterStringEquals(),
            paramValue, true );

              ElementParameterFilter filter
            = new ElementParameterFilter( rule );

              FilteredElementCollector collector
            = new FilteredElementCollector(
              doc, doc.ActiveView.Id );

              elems = collector.WherePasses( filter )
            .ToElements();
            }
              }
              return elems;
        }