Called once just before the plugin is unloaded. If the plugin implements IDisposable, then Dispose will be called immediately after the plugin is unloaded. Plugins are typically unloaded at application shutdown or when the end user has disabled a plugin. Default implementation does nothing. This is a good place to unsubscribe from API events.

Protected Overridable Sub OnUnloading

protected virtual void OnUnloading()

protected:
virtual void OnUnloading()