Add new EnumToBooleanConverter

src/Avalonia.Controls/Converters/EnumToBooleanConverter.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Globalization;
+using Avalonia.Data;
+using Avalonia.Data.Converters;
+
+namespace Avalonia.Controls.Converters
+{
+    /// <summary>
+    /// Converter to convert an enum value to bool by comparing to the given parameter.
+    /// Both value and parameter must be of the same enum type.
+    /// </summary>
+    /// <remarks>
+    /// This converter is useful to enable binding of radio buttons with a selected enum value.
+    /// </remarks>
+    public class EnumToBooleanConverter : IValueConverter
+    {
+        /// <inheritdoc/>
+        public object? Convert(
+            object? value,
+            Type targetType,
+            object? parameter,
+            CultureInfo culture)
+        {
+            if (value == null &&
+                parameter == null)
+            {
+                return true;
+            }
+            else if (value == null ||
+                     parameter == null)
+            {
+                return false;
+            }
+            else
+            {
+                return value!.Equals(parameter);
+            }
+        }
+
+        /// <inheritdoc/>
+        public object? ConvertBack(
+            object? value,
+            Type targetType,
+            object? parameter,
+            CultureInfo culture)
+        {
+            if (value is bool boolValue)
+            {
+                return boolValue ? parameter : BindingOperations.DoNothing;
+            }
+            else
+            {
+                return BindingOperations.DoNothing;
+            }
+        }
+    }
+}

src/Avalonia.Controls/Converters/EnumValueEqualsConverter.cs

@@ -10,7 +10,11 @@ namespace Avalonia.Controls.Converters
     public class EnumValueEqualsConverter : IValueConverter
     {
         /// <inheritdoc/>
-        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+        public object? Convert(
+            object? value,
+            Type targetType,
+            object? parameter,
+            CultureInfo culture)
         {
             // Note: Unlike string comparisons, null/empty is not supported
             // Both 'value' and 'parameter' must exist and if both are missing they are not considered equal
@@ -46,7 +50,11 @@ namespace Avalonia.Controls.Converters
         }
 
         /// <inheritdoc/>
-        public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+        public object? ConvertBack(
+            object? value,
+            Type targetType,
+            object? parameter,
+            CultureInfo culture)
         {
             throw new System.NotImplementedException();
         }