A check is performed the first time a method using the Feature ID indicated for that method is called, regardless of the number of methods that share the same Feature ID across the program.

A check is performed when the method is run, once for each Feature ID within the same class.

If the same Feature ID is also assigned to the class constructor, the check is performed the first time the .ctor method is run.

If the same Feature ID is used in other classes, the check is performed separately for each class.

NOTE   The Once per class instance frequency is available only for Instance methods.