Collections

Most Revit Platform API properties and methods use customized collection classes defined in the Revit Platform API when providing access to a group of related items. These collections are of one of three basic types:

• Array
• Set
• Map

These collection classes were written before generic type-safe .NET classes like List<T> existed.

The IEnumerable and IEnumerator interfaces implemented in Revit collection types are defined in the System.Collection namespace.