问重复扫描的ZXING手机问题

EN

public async  void  BtnScanStockTakeItem_Clicked(object sender, EventArgs e)
{    

     var scanPage = new ZXingScannerPage();
     scanPage.ToggleTorch();
     scanPage.IsScanning = true;               
     await Navigation.PushAsync(scanPage);
     scanPage.OnScanResult += (result) =>
     {


      // Stop scanning
      scanPage.IsScanning = false;

      // Pop the page and show the result
      Device.BeginInvokeOnMainThread(async () =>
    {
        await Navigation.PopAsync();
    }
}

private async void SaveFunction(object sender, EventArgs e)
{

        foreach (var item in transferList)
        {

            int z = await restServices.PostStockTakeTransaction(item);
        }
        Preferences.Set("StockTakeWarehouse", pickStockTake.SelectedIndex);
        WarehouseName = pickStockTake.SelectedItem.ToString();
        bool x = await DisplayAlert("Test", "Item Saved", "ReScan", "Cancel");
        if (x)
        {
             BtnScanStockTakeItem_Clicked(sender, e);
            //this is where it rescans the item
        }
 }