v2rayN/v2rayN/v2rayN.Desktop/Views/QrcodeView.axaml.cs

using Avalonia.Controls;
using Avalonia.Media.Imaging;
using Avalonia.Threading;

namespace v2rayN.Desktop.Views;

public partial class QrcodeView : UserControl
{
    public QrcodeView()
    {
        InitializeComponent();
    }

    public QrcodeView(string? url)
    {
        InitializeComponent();

        txtContent.Text = url;
        imgQrcode.Source = GetQRCode(url);

        txtContent.GotFocus += (_, _) => Dispatcher.UIThread.Post(() => { txtContent.SelectAll(); });
    }

    private Bitmap? GetQRCode(string? url)
    {
        var bytes = QRCodeHelper.GenQRCode(url);
        return ByteToBitmap(bytes);
    }

    private Bitmap? ByteToBitmap(byte[]? bytes)
    {
        if (bytes is null)
        {
            return null;
        }

        using var ms = new MemoryStream(bytes);
        return new Bitmap(ms);
    }
}