How receives push notification in Windows with MAUI

Question

I'm creating an application using .NET8 MAUI. The application registers the device in an Azure Notification Hub. From here, I can send push notifications to the different devices.

The problem I have with Windows is that the message arrives on the Windows application, only if the application is open. I like to understand if it is possible to register the application to wait for messages in the background.

I saw in the Package.appxmanifest for Windows those settings

but I can't find a way to use it. How do I have to configure the application in order to receive push notifications also when the application is closed?

Answer 1

@Enrico Rossini Please note that this is outside the scope of Azure Notifications Hubs, which is what I support. Please go easy on me as I would like to try and assist you. To receive push notifications in the background on Windows with .NET MAUI, you need to register a background task in your application. This background task will be triggered when a push notification is received, even if the application is closed. To register a background task, you need to add the following code to your App.xaml.cs file:

private async void RegisterBackgroundTask()
{
    var builder = new BackgroundTaskBuilder();
    builder.Name = "PushNotificationBackgroundTask";
    builder.SetTrigger(new PushNotificationTrigger());
    builder.Register();
}

This code creates a new BackgroundTaskBuilder object, sets the name of the background task to "PushNotificationBackgroundTask", and sets the trigger to a PushNotificationTrigger. Finally, it registers the background task. You can call this method from the OnLaunched method of your App.xaml.cs file to register the background task when the application is launched:

protected override void OnLaunched(LaunchActivatedEventArgs args)
{
    RegisterBackgroundTask();

    // Rest of the OnLaunched method
}

You also need to add the uap:Capability element to your Package.appxmanifest file, as you mentioned. This element should be added as a child of the Package element, like this:

<Package
    ...
    xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
    IgnorableNamespaces="uap">

    <uap:Capability Name="internetClient" />
    <uap:Capability Name="internetClientServer" />
    <uap:Capability Name="privateNetworkClientServer" />
    <uap:Capability Name="userNotificationListener" />
    <uap:Capability Name="removableStorage" />
    <uap:Capability Name="backgroundMediaPlayback" />
    <uap:Capability Name="backgroundVoIP" />
    <uap:Capability Name="backgroundTasks" />
    <uap:Capability Name="pushNotifications" />
    
    ...
</Package>

Make sure to add the pushNotifications capability to enable push notifications.