Creating a new desktop app with avaloniaui

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

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+using Avalonia.Controls;
+using Avalonia.Media.Imaging;
+
+namespace v2rayN.Desktop.Views
+{
+    public partial class QrcodeView : Window
+    {
+        public QrcodeView(string? url)
+        {
+            InitializeComponent();
+
+            txtContent.Text = url;
+            imgQrcode.Source = GetQRCode(url);
+
+            btnCancel.Click += (s, e) => this.Close();
+        }
+
+        private Bitmap? GetQRCode(string? url)
+        {
+            var qrCodeImage = QRCodeHelper.GenQRCode(url);
+            if (qrCodeImage is null) return null;
+            var ms = new MemoryStream(qrCodeImage);
+            return new Bitmap(ms);
+        }
+    }
+}