如何在显示应用程序之前在UWP中运行进程

using Windows.ApplicationModel.Background;

...

private void RegisterBackgroundTask()
{
    // 创建一个后台任务
    BackgroundTaskBuilder taskBuilder = new BackgroundTaskBuilder();
    taskBuilder.Name = "MyBackgroundTask";
    taskBuilder.TaskEntryPoint = "MyNamespace.MyBackgroundTaskClass";

    // 设置触发器（例如计时器触发器）
    TimeTrigger trigger = new TimeTrigger(15, false);
    taskBuilder.SetTrigger(trigger);

    // 注册后台任务
    BackgroundTaskRegistration taskRegistration = taskBuilder.Register();
}

using Windows.ApplicationModel.Background;

public sealed class MyBackgroundTaskClass : IBackgroundTask
{
    public void Run(IBackgroundTaskInstance taskInstance)
    {
        // 在此处编写后台任务的逻辑代码
    }
}

<Package>
    <Applications>
        <Application>
            ...
            <Extensions>
                <BackgroundTasks>
                    <Task Type="systemEvent" EntryPoint="MyNamespace.MyBackgroundTaskClass"/>
                </BackgroundTasks>
            </Extensions>
        </Application>
    </Applications>
</Package>