PushNotificationChannelManager.ChannelsRevoked 事件

定义

命名空间:

Windows.Networking.PushNotifications

撤销推送通道时引发，以便可以立即请求新通道。 这可最大程度地减少使用吊销的 WNS 通道造成的任何停机时间。 事件参数类型为 PushNotificationChannelsRevokedEventArgs。

// Register
static event_token ChannelsRevoked(EventHandler<PushNotificationChannelsRevokedEventArgs> const& handler) const;

// Revoke with event_token
static void ChannelsRevoked(event_token const* cookie) const;

// Revoke with event_revoker
static PushNotificationChannelManager::ChannelsRevoked_revoker ChannelsRevoked(auto_revoke_t, EventHandler<PushNotificationChannelsRevokedEventArgs> const& handler) const;

public static event System.EventHandler<PushNotificationChannelsRevokedEventArgs> ChannelsRevoked;

function onChannelsRevoked(eventArgs) { /* Your code */ }
Windows.Networking.PushNotifications.PushNotificationChannelManager.addEventListener("channelsrevoked", onChannelsRevoked);
Windows.Networking.PushNotifications.PushNotificationChannelManager.removeEventListener("channelsrevoked", onChannelsRevoked);
- or -
Windows.Networking.PushNotifications.PushNotificationChannelManager.onchannelsrevoked = onChannelsRevoked;

Public Shared Custom Event ChannelsRevoked As EventHandler(Of PushNotificationChannelsRevokedEventArgs) 

事件类型

EventHandler<PushNotificationChannelsRevokedEventArgs>

EventHandler<PushNotificationChannelsRevokedEventArgs>

Windows 要求

设备系列	Windows 10, version 2004 (在 10.0.19041.0 中引入)
API contract	Windows.Foundation.UniversalApiContract (在 v10.0 中引入)

示例

// Create the manager, and subscribe to the ChannelsRevoked event.

PushNotificationChannel channel = null;
PushNotificationChannelManager.ChannelsRevoked += OnChannelsRevoked;

try
{
    // Create the channel manager for the user.
    PushNotificationChannelManagerForUser channelManagerForUser = PushNotificationChannelManager.GetDefault();

    // Create the channel.
    channel = await channelManagerForUser.CreatePushNotificationChannelForApplicationAsync();

    // If the channel isn't null, send to app service.
    if (channel != null)
    {
        sendChannelURIToServer(channel.Uri);
    }
}
catch (Exception e){ ... }

...

private async void OnChannelsRevoked(PushNotificationChannelsRevokedEventArgs e)
{
    // PushNotificationChannelsRevokedEventArgs has no members.
    // Previous channel was revoked, time to create a new channel as shown above.
    ...
}    

注解

创建推送通道以通过 WNS 从服务接收推送通知。 这些通道不是永久性的，可能会因各种原因而更改， (最常见的原因是通道在) 30 天后过期。 平台中还可能发生撤销通道 (例如全局设备 ID 更改) 的事件。 但是，如果你使用此事件，则无需在每次启动应用时请求新频道。