public virtual void InsertParts( int beforePartIndex, IEnumerable<IEnumerable<Segment>> parts )
Public Overridable Sub InsertParts( _ ByVal beforePartIndex As Integer, _ ByVal parts As IEnumerable(Of IEnumerable(Of Segment)) _ )
Parameters
- beforePartIndex
 - 0 based index. Specify 0 to insert at the beginning. Specify (CountParts - 1) or -1 to insert at the end.
 - parts
 - n enumeration of parts built from an enumeration of segments.