Create UInt32ToColorConverter.cs

samples/ColorPickerDemo/UInt32ToColorConverter.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Globalization;
+using Avalonia;
+using Avalonia.Data.Converters;
+using Avalonia.Media;
+
+namespace ColorPickerDemo;
+
+public class UInt32ToColorConverter : IValueConverter
+{
+    public static UInt32ToColorConverter Instance = new();
+
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is uint c && (targetType == typeof(Color?) || targetType == typeof(Color)))
+        {
+            try
+            {
+                return Color.FromUInt32(c);
+            }
+            catch (Exception)
+            {
+                return AvaloniaProperty.UnsetValue;
+            }
+        }
+        return AvaloniaProperty.UnsetValue;
+    }
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is Color c2 && targetType == typeof(uint))
+        {
+            try
+            {
+                return c2.ToUint32();
+            }
+            catch (Exception)
+            {
+                return AvaloniaProperty.UnsetValue;
+            }
+        }
+        return AvaloniaProperty.UnsetValue;
+    }
+}