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a guest Aug 19th, 2019 66 Never
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  1. private async void ScannerSelection_Changed(object sender, SelectionChangedEventArgs args)
  2.     {
  3.         var selectedScannerInfo = (BarcodeScannerInfo)args.AddedItems[0];
  4.         var deviceId = selectedScannerInfo.DeviceId;
  5.  
  6.         if (isSelectionChanging)
  7.         {
  8.             pendingSelectionDeviceId = deviceId;
  9.             return;
  10.         }
  11.  
  12.         do
  13.         {
  14.             await SelectScannerAsync(deviceId); <- ошибка тут
  15.  
  16.             // Stop takes precedence over updating the selection.
  17.             if (isStopPending)
  18.             {
  19.                 await CloseScannerResourcesAsync();
  20.                 break;
  21.             }
  22.  
  23.             deviceId = pendingSelectionDeviceId;
  24.             pendingSelectionDeviceId = null;
  25.         } while (!String.IsNullOrEmpty(deviceId));
  26.     }
  27.      
  28. private async Task SelectScannerAsync(string scannerDeviceId)
  29.     {
  30.         isSelectionChanging = true;
  31.  
  32.         await CloseScannerResourcesAsync();
  33.  
  34.         selectedScanner = await BarcodeScanner.FromIdAsync(scannerDeviceId);
  35.  
  36.         if (selectedScanner != null)
  37.         {
  38.             claimedScanner = await selectedScanner.ClaimScannerAsync();
  39.             if (claimedScanner != null)
  40.             {
  41.                 await claimedScanner.EnableAsync();
  42.                 claimedScanner.Closed += ClaimedScanner_Closed;
  43.                 ScannerSupportsPreview = !String.IsNullOrEmpty(selectedScanner.VideoDeviceId);
  44.                 RaisePropertyChanged(nameof(ScannerSupportsPreview));
  45.  
  46.                 claimedScanner.DataReceived += ClaimedScanner_DataReceived;
  47.  
  48.                 if (ScannerSupportsPreview)
  49.                 {
  50.                     await StartMediaCaptureAsync(selectedScanner.VideoDeviceId);
  51.                 }
  52.             }
  53.             else
  54.             {
  55.                 //rootPage.NotifyUser("Failed to claim the selected barcode scanner", NotifyType.ErrorMessage);
  56.             }
  57.  
  58.         }
  59.         else
  60.         {
  61.             //rootPage.NotifyUser("Failed to create a barcode scanner object", NotifyType.ErrorMessage);
  62.         }
  63.  
  64.         IsScannerClaimed = claimedScanner != null;
  65.         RaisePropertyChanged(nameof(IsScannerClaimed));
  66.  
  67.         isSelectionChanging = false;
  68.     }
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