public Result Execute(
ExternalCommandData commandData,
ref string message,
ElementSet elements)
{
UIApplication app = commandData.Application;
Document doc = app.ActiveUIDocument.Document;
FilteredElementCollector levels = Util.GetElementsOfType(
doc, typeof( Level ), BuiltInCategory.OST_Levels );
Level level = levels.FirstElement() as Level;
if( null == level )
{
message = "No level found.";
return Result.Failed;
}
// get symbol to use:
BuiltInCategory bic;
Type t;
// this retrieves the railing baluster symbols
// but they cannot be used to create a railing:
bic = BuiltInCategory.OST_StairsRailingBaluster;
t = typeof( FamilySymbol );
// this retrieves all railing symbols,
// but they are just Symbol instances,
// not FamilySymbol ones:
bic = BuiltInCategory.OST_StairsRailing;
t = typeof( ElementType );
FilteredElementCollector symbols
= Util.GetElementsOfType( doc, t, bic );
FamilySymbol sym = null;
foreach( ElementType s in symbols )
{
FamilySymbol fs = s as FamilySymbol;
Debug.Print(
"Family name={0}, symbol name={1},"
+ " category={2}",
null == fs ? "<none>" : fs.Family.Name,
s.Name,
s.Category.Name );
if( null == sym && s is ElementType )
{
// this does not work, of course:
sym = s as FamilySymbol;
}
}
if( null == sym )
{
message = "No railing family symbols found.";
return Result.Failed;
}
using ( Transaction tx = new Transaction( doc ) )
{
tx.Start( "Create New Railing" );
XYZ p1 = new XYZ( 17, 0, 0 );
XYZ p2 = new XYZ( 33, 0, 0 );
Line line = Line.CreateBound( p1, p2 );
// we need a FamilySymbol instance here, but only have a Symbol:
FamilyInstance Railing1
= doc.Create.NewFamilyInstance(
line, sym, level, StructuralType.NonStructural );
tx.Commit();
}
return Result.Succeeded;
}
