Public Function IsLinked( _
   ByVal fromdata As NodeType, _
   ByVal fromparam As PortKey, _
   ByVal todata As NodeType, _
   ByVal toparam As PortKey _
) As Boolean

public bool IsLinked( 
   NodeType fromdata,
   PortKey fromparam,
   NodeType todata,
   PortKey toparam
)

Parameters

fromdata

a node key identifying the node data from which the link comes

fromparam

an optional value identifying which port on the "from" node the link is connected to

todata

a node key identify the node data to which the link goes

toparam

an optional value identifying which port on the "to" node the link is connected to

This is used for model navigation and graph traversal.

Reference