Revit 2011二次开发之得到选择的对象

start

[Transaction(TransactionMode.Manual)]
[Regeneration(RegenerationOption.Manual)]
public   class  Document_Selection : IExternalCommand
{
     public  Result Execute(ExternalCommandData commandData,  ref   string  messages, ElementSet elements)
    {
         try
        {
            UIDocument uidoc  =  commandData.Application.ActiveUIDocument;
             // 得到选择的对象
            Selection selection  =  uidoc.Selection;
            ElementSet collection  =  selection.Elements;
             if  ( 0   ==  collection.Size)
            {
                TaskDialog.Show( " Revit " ,  " You haven't selected any elements " );
            }
             else
            {
                 string  info  =   " Ids of selected elements in the document are: " ;
                 foreach  (Element elem  in  collection)
                {
                    info  +=   " \n\t "   +  elem.Id.IntegerValue;
                }
                TaskDialog.Show( " Revit " , info);
            }

             // 得到当前文档中门的ID
            ElementClassFilter familyInstanceFilter  =   new  ElementClassFilter( typeof (FamilyInstance));
            ElementCategoryFilter doorsCategoryfilter  =   new  ElementCategoryFilter(BuiltInCategory.OST_Doors);
            LogicalAndFilter doorsInstancefilter  =   new  LogicalAndFilter(familyInstanceFilter, doorsCategoryfilter);
            FilteredElementCollector collector  =   new  FilteredElementCollector(uidoc.Document);
            ICollection < ElementId >  doors  =  collector.WherePasses(doorsInstancefilter).ToElementIds();
             string  prompt  =   " the ids of the doors in the current document are: " ;
             foreach  (ElementId id  in  doors)
            {
                prompt  +=   " \n\t "   +  id.IntegerValue;
            }
            TaskDialog.Show( " Revit " , prompt);
        }
         catch  (Exception e)
        {
            messages  =  e.Message;
             return  Result.Failed;
        }
         return  Result.Succeeded;
    }
}

end