Xamarin フォーム バーコード スキャナー 質問する

以下のコードを試すことができます。ソリューション内のすべてのプロジェクトにzxingライブラリ/コンポーネントを追加します

public class Home : ContentPage
{
    string message = "";
    public Home()
    {
        //Intialize the button
        Button btnScan = new Button
        {
            Text = "Start Scan",
            BackgroundColor = Color.FromRgb(207, 197, 159),
            TextColor = Color.White,
            BorderRadius = 5,
            TranslationY = 120
        };
        //Attach the click event
        btnScan.Clicked += btnScan_Clicked;

        this.Content = new StackLayout
        {
            BackgroundColor = Color.FromRgb(150, 172, 135),
            Spacing = 10,
            Padding = 25,
            Children =
            {
                btnScan
            }
        };
    }

    async void btnScan_Clicked(object sender, EventArgs e)
    {
        var scanner = new MobileBarcodeScanner();
        scanner.TopText = "Hold the camera up to the barcode\nAbout 6 inches away";
        scanner.BottomText = "Wait for the barcode to automatically scan!";

        //This will start scanning
        ZXing.Result result = await scanner.Scan();

        //Show the result returned.
        HandleResult(result);
    }

    void HandleResult(ZXing.Result result)
    {
        var msg = "No Barcode!";
        if (result != null)
        {
            msg = "Barcode: " + result.Text + " (" + result.BarcodeFormat + ")";
        }

        DisplayAlert("", msg, "Ok");
    }
}