EventRegistrationToken EventRegistrationToken EventRegistrationToken Struct
Represents a reference to a delegate that receives change notifications.
.NET When programming with .NET, this type is hidden. Advanced-scenario developers should use System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken.
public : struct EventRegistrationToken
public struct EventRegistrationToken
Public Structure EventRegistrationToken
Windows 10 (introduced v10.0.10240.0)
Windows.Foundation.FoundationContract (introduced v1)
When programming with .NET, this type is hidden and developers that need an event registration token for advanced event scenarios should use the System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken type. For most app code, you won't need EventRegistrationToken (or event registration tokens) at all, because the add/remove syntax for C# and Visual Basic languages enables the compiler to generate the registration tokens from a simpler syntax.
In the event subscription model, a delegate registers to receive change notifications from a specified object such as a collection. The EventRegistrationToken is used to remove the delegate as a subscriber of change notifications when notifications are no longer needed.