/// <summary>/// 视频捕捉对象/// </summary>public MediaCapture TheCapture { get; private set; }/// <summary>/// 初始化摄像头/// </summary>private async Task InitializeCapture (){TheCapture = new MediaCapture();// 查找后置摄像头var deviceCollection = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);DeviceInformation backCamera = deviceCollection.FirstOrDefault(d => d.EnclosureLocation.Panel == Windows.Devices.Enumeration.Panel.Back);if (backCamera != null){MediaCaptureInitializationSettings setting = new MediaCaptureInitializationSettings();setting.AudioDeviceId = "";setting.VideoDeviceId = backCamera.Id;await TheCapture.InitializeAsync(setting);}else{await TheCapture.InitializeAsync();}}/// <summary>/// 清理摄像头相关资源/// </summary>private void CleanupCapture (){if (TheCapture != null){TheCapture.Dispose();TheCapture = null;}}

        protected async override void OnLaunched(LaunchActivatedEventArgs e){// 隐藏状态栏Windows.UI.ViewManagement.StatusBar statusbar =Windows.UI.ViewManagement.StatusBar.GetForCurrentView();await statusbar.HideAsync();
#if DEBUGif (System.Diagnostics.Debugger.IsAttached){this.DebugSettings.EnableFrameRateCounter = true;}
#endif await this.InitializeCapture();
     ……

        private async void OnSuspending(object sender, SuspendingEventArgs e){var deferral = e.SuspendingOperation.GetDeferral();// TODO: 保存应用程序状态并停止任何后台活动// 停止拍摄预览await TheCapture.StopPreviewAsync();this.CleanupCapture();deferral.Complete();}

        async void OnResuming ( object sender, object e ){await this.InitializeCapture();Frame root = Window.Current.Content as Frame;if (root != null){MainPage page = root.Content as MainPage;if (page != null)await page.SetCaptureSourceAsync();}}

        public async System.Threading.Tasks.Task SetCaptureSourceAsync (){capture = (App.Current as App).TheCapture;ce.Source = capture;await capture.StartPreviewAsync();}