Get the Subcategory of a Reference Plane

This Revit Macro will get the subcategory of a reference plane.

public void GetCat()

{

//find a subcategory of reference planes by name

UIDocument uidoc = ActiveUIDocument;

Document doc = ActiveUIDocument.Document;

Autodesk.Revit.DB.View pView = ActiveUIDocument.Document.ActiveView;

Selection selection = uidoc.Selection;

ICollection<ElementId> selectedIds = uidoc.Selection.GetElementIds();

//test example code for lines;

/*

Categories cats = doc.Settings.Categories;

Category lineCat = null;

foreach (Category cat in cats)

{

if (cat.Id.IntegerValue == -2000530)

{

lineCat = cat;

break;

}

}

if (lineCat != null)

{

foreach (Category subCat in lineCat.SubCategories)

{

if (revitFamily.FamilyName == "Model Lines")

types.Add(subCat.Name);

else if (revitFamily.FamilyName == "Detail Lines" && !subCat.Name.StartsWith("<") && !subCat.Name.EndsWith(">"))

types.Add(subCat.Name);

}

}

*/

//Earlier attempt to find the subcategories and to add one and change the color

//filter to find the subcategories

//ElementCategoryFilter filter = new ElementCategoryFilter(BuiltInCategory.OST_CLines);

//

//FilteredElementCollector collector = new FilteredElementCollector(doc);

//IList<Element> subcats = collector.WherePasses(filter).WhereElementIsNotElementType().ToElements();

//String prompt = "The subcategories in the current document are:\n";

//foreach (Element e in subcats)

// {

//ElementId id = e.Id;

// Category cat = e.Category;

// prompt += e.Name + " " + cat.Name.ToString() + "\n";

// }

// TaskDialog.Show("Revit", prompt);

///THIS WORKS FOR GETTING ITEM SUBCATEGORIES

Category refCat = doc.Settings.Categories.get_Item(BuiltInCategory.OST_CLines);

CategoryNameMap subcats = refCat.SubCategories;

Category myCat = subcats.get_Item("TopPlane Subcategory");

if (myCat != null)

{

TaskDialog.Show ("Found TopPlane Subcategory", myCat.Name.ToString ());

TaskDialog.Show("Element ID", myCat.Id.ToString ());

}

else

{

TaskDialog.Show("Did not find subcategory", "So Sad :(");

}

//Category refsubCat;

//string newSubCatName = "Test Create Ref Subcat";

//Color newSubCatColor = new Color(255, 0, 0); //Red

//try

//{

//using (Transaction docTransaction = new Transaction(doc, "ref planes SubCategory"))

//{

//docTransaction.Start();

//refsubCat = doc.Settings.Categories.NewSubcategory(refCat, newSubCatName);

//refsubCat.LineColor = newSubCatColor;

//docTransaction.Commit();

//}

//}

//catch (Exception ex)

//{

//MessageBox.Show(ex.ToString());

//}

}