A thread action: jumps to an article thread (bead) in this or another document.
public sealed class PdfThreadAction : PdfAction
ISO 32000-2 §12.6.4.7, Table 209 (PDF 1.1), and §12.4.3 (articles, exposed raw). The thread is given by its dictionary
(ThreadDictionary), by its index in the catalog's Threads array (ThreadIndex) or by its title
(ThreadTitle); the bead likewise by dictionary or index. When File is present they belong to that file.
kind:method, kind:property, kind:ctor. Press Esc to clear.BeadGets the bead (B) as stored: a bead dictionary or an index into the thread's beads; null: the first bead.BeadDictionaryGets the bead dictionary when B is one, else null.BeadIndexGets the 0-based index of the bead in the thread when B is an integer, else null.FileGets the file holding the thread (F), or null: this document.KindGets the type of action ActionType names in Table 201, or Unknown.ThreadGets the thread (D, required) as stored: a thread dictionary, an index or a title; null when absent.ThreadDictionaryGets the thread dictionary when D is one, else null.ThreadIndexGets the 0-based index of the thread in the catalog's Threads array when D is an integer, else null.ThreadTitleGets the title of the thread when D is a text string, else null; the first thread with that title is meant.