Base class for all instances of EventArg<T0>.
Use the EventArg.Create factory method to create instances and
EventArg<T0>.Register, EventArg<T0>.Unregister to assign argument values
to individual elements for all callbacks that use this argument identifier in their definition.
Additional resources: EventArg<T0>, EventCallbackDefinition
| Method | Description |
|---|---|
| Create | Creates a EventArg<T0> containing a unique identifier. |