EventRegistrationToken Struct
Definition
Important
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Represents a reference to a delegate that receives change notifications.
.NET When programming with .NET, this type is hidden. For advanced scenarios, use System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken instead.
C++/WinRT In the C++/WinRT language projection, this type appears as winrt::event_token.
public value class EventRegistrationToken/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.FoundationContract, 65536)]
struct EventRegistrationToken[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.FoundationContract), 65536)]
public struct EventRegistrationTokenvar eventRegistrationToken = {
value : /* Your value */
}Public Structure EventRegistrationToken- Inheritance
-
EventRegistrationToken
- Attributes
Windows requirements
| Device family |
Windows 10 (introduced in 10.0.10240.0)
|
| API contract |
Windows.Foundation.FoundationContract (introduced in v1.0)
|
Remarks
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.
Fields
| Value |
The reference to the delegate. A valid reference will not have a value of zero. |