c# - Xamarin CrossMediaManager 视频仅适用于第一次运行

Question

我正在使用 CrossMediaManager 在我的标签下载文件夹中播放视频，视频播放路径是file:///storage/emulated/0/Download/DilmahStory.mp4

问题是当我将视频页面移动到另一个页面并返回视频页面时，视频暂停了。要求是每次用户打开视频页面时从头开始播放视频。

视频页面查看模型如下

 public class GuestVideoViewModel : ContextViewModelBase
    {
        private string videoUrl = "file:///storage/emulated/0/Download/DilmahStory.mp4";
        private TimeSpan seekTime;
        public GuestVideoViewModel(IAppContext context) : base(context)
        {
            Title = "Guest Vedio Page";
            ActionCommand = new Command(OnActionCommand);
            PageAppearingCommand = new Command(OnPageAppearingCommand);
            PageDisappearingCommand = new Command(OnPageDisappearingCommand);
        }

        public string GotoMenuName { get; set; } = "START ORDER";

        public ICommand ActionCommand { get; }

        private void OnActionCommand()
        {
            Navigator.PushAsync<DashboardMainFirstViewMode>();
        }

        private async void OnPageDisappearingCommand()
        {
            seekTime = CrossMediaManager.Current.Position;
            await CrossMediaManager.Current.Stop();
            CrossMediaManager.Current.StatusChanged -= CurrentOnStatusChanged;

           // 
        }

        private async void OnPageAppearingCommand()
        {
            if (await GetStoragePermisson())
            {
                CrossMediaManager.Current.StatusChanged += CurrentOnStatusChanged;

                await CrossMediaManager.Current.Play(videoUrl, MediaFileType.Video);

            }
        }

        private void CurrentOnStatusChanged(object sender, StatusChangedEventArgs e)
        {

            Debug.WriteLine($"MediaManager Status: {e.Status}");

        }

        private async Task<bool> GetStoragePermisson()
        {
            var status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Storage);
            if (status != PermissionStatus.Granted)
            {
                var results = await CrossPermissions.Current.RequestPermissionsAsync(new[] { Permission.Storage });
                status = results[Permission.Storage];
            }
            return status == PermissionStatus.Granted;
        }
    }
} 

我不知道为什么打开视频页面时视频没有从头开始，如果有人可以指导我应该在OnPageAppearingCommand()or上更改什么，我将非常感激OnPageDisappearingCommand()，提前感谢您的支持。