| Overload | Description | 
|---|---|
| Contains(SubscriptionToken) | Returns true if there is a subscriber matching SubscriptionToken. | 
| Contains(Action<TPayload>) | Returns true if there is a subscriber matching | 
| Overload | Description | 
|---|---|
| Contains(SubscriptionToken) | Returns true if there is a subscriber matching SubscriptionToken. | 
| Contains(Action<TPayload>) | Returns true if there is a subscriber matching | 
Target Platforms: Windows 10, Windows 8.1