问题描述

在Notification Hub中注册了设备后，从Azure门户上没有找到相应的入口来删除已注册设备 (Active Devices)

如果使用C# SDK是否有办法删除呢？

问题解答

可以的，查看Notification Hub的文档，可以通过注册ID来删除一个注册设备：https://docs.azure.cn/zh-cn/notification-hubs/notification-hubs-push-notification-registration-management#example-code-to-register-with-a-notification-hub-from-a-backend-using-a-registration-id

示例代码

MainPage.xaml.cs

using Microsoft.Azure.NotificationHubs;
using Microsoft.WindowsAzure.Messaging;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Threading.Tasks;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Networking.PushNotifications;
using Windows.UI.Popups;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409

namespace NoteHubApp
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class MainPage : Page
    {
        //Connection String & Notification Hub Name
        const string nhName = "NH Name";
        const string managementConnectionString = "NH Connection String";

        NotificationHubClient hub = NotificationHubClient.CreateClientFromConnectionString(managementConnectionString, nhName);


        List<string> registrationIds = new List<string>();
        public MainPage()
        {
            this.InitializeComponent();
        }

        private void MyButton_Click(object sender, RoutedEventArgs e)
        {
            RegisterDevices();

            RefreshAllRegistration();
        }
        private async void RegisterDevices()
        {
            var channel = await PushNotificationChannelManager.CreatePushNotificationChannelForApplicationAsync();
            // create a registration description object of the correct type, e.g.
            var reg = new WindowsRegistrationDescription(channel.Uri);
            // Create
            var result = await hub.CreateRegistrationAsync(reg);
            // Displays the registration ID so you know it was successful
            if (result.RegistrationId != null)
            {
                registrationIds.Add(result.RegistrationId);

                var dialog = new MessageDialog("Registration successful: " + result.RegistrationId);
                dialog.Commands.Add(new UICommand("OK"));
                await dialog.ShowAsync();
            }
        }
        private void Refresh_Click(object sender, RoutedEventArgs e)
        {
            RefreshAllRegistration();
        }

        private async void RefreshAllRegistration()
        {
            registrationIds.Clear();

            var allRegistrations = await hub.GetAllRegistrationsAsync(100);

            showresult.Text = "Registrations Total is " + allRegistrations.Count().ToString() + "\n";

            foreach (var registration in allRegistrations)
            {
                registrationIds.Add(registration.RegistrationId);

                showresult.Text += registration.RegistrationId + "\n";
            }

            //var dialogs = new MessageDialog("Get Registrations Number " + allRegistrations.Count().ToString());
            //dialogs.Commands.Add(new UICommand("OK"));
            //await dialogs.ShowAsync();
        }

        private void Delete_Click(object sender, RoutedEventArgs e)
        {
            DeleteDevices();
        }

        private async void DeleteDevices()
        {
            if (registrationIds.Count > 0)
            {
                var rid = registrationIds[registrationIds.Count - 1];
                // Get by ID
                var r = await hub.GetRegistrationAsync<RegistrationDescription>(rid);
                try
                {
                    // delete
                    await hub.DeleteRegistrationAsync(r);
                    registrationIds.Remove(rid);
                    var dialog = new MessageDialog("Delete Registration: " + rid);
                    dialog.Commands.Add(new UICommand("OK"));
                    await dialog.ShowAsync();
                }
                catch
                {
                }

                RefreshAllRegistration();
            }
        }
    }
}

MainPage.xaml

<Page
    x:Class="NoteHubApp.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:NoteHubApp"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Height="1027" Width="1623">
    <Grid Margin="0,0,66,30">
        <Button x:Name="MyButton" Content="Register One!" Click="MyButton_Click" Height="244" Width="243" Margin="48,610,0,0" VerticalAlignment="Top" RenderTransformOrigin="2.758,-2.919" Background="#33228919"/>
        <Button x:Name="MyButton_Copy" Content="Refresh All Register!" Click="Refresh_Click" Height="809" Width="198" Margin="723,36,0,0" VerticalAlignment="Top" Background="#33D26136"/>
        <Button x:Name="MyButton_Copy1" Content="Delete Old One!" Click="Delete_Click" Height="238" Width="374" Margin="315,613,0,0" VerticalAlignment="Top" Background="#33172D5D"/>
        <TextBox x:Name="showresult" HorizontalAlignment="Left" Margin="30,28,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Height="556" Width="664" Background="#667B857A"/>
    </Grid>
</Page>

UI 展示如下：

参考资料

注册管理 (DeleteRegistrationAsync)  ： https://docs.azure.cn/zh-cn/notification-hubs/notification-hubs-push-notification-registration-management#example-code-to-register-with-a-notification-hub-from-a-backend-using-a-registration-id