From f0d807d40bc418ec9b92040692ff784232d19cf9 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Thu, 13 Jan 2022 11:26:12 +0100
Subject: [PATCH] Added repro of #2725 to BindingDemo.

---
 samples/BindingDemo/EnumToEnumerable.cs       | 22 +++++++++++++++++++
 samples/BindingDemo/MainWindow.xaml           |  6 ++++-
 .../ViewModels/MainWindowViewModel.cs         |  6 +++++
 3 files changed, 33 insertions(+), 1 deletion(-)
 create mode 100644 samples/BindingDemo/EnumToEnumerable.cs

diff --git a/samples/BindingDemo/EnumToEnumerable.cs b/samples/BindingDemo/EnumToEnumerable.cs
new file mode 100644
index 0000000000..f16c516a2c
--- /dev/null
+++ b/samples/BindingDemo/EnumToEnumerable.cs
@@ -0,0 +1,22 @@
+using System;
+using Avalonia.Markup.Xaml;
+
+namespace BindingDemo
+{
+    public class EnumToEnumerable : MarkupExtension
+    {
+        private readonly Type _enumType;
+
+        public EnumToEnumerable(Type type)
+        {
+            if (!type.IsEnum)
+                throw new ArgumentException(nameof(type));
+            _enumType = type;
+        }
+        
+        public override object ProvideValue(IServiceProvider serviceProvider)
+        {
+            return Enum.GetValues(_enumType);
+        }
+    }
+}
diff --git a/samples/BindingDemo/MainWindow.xaml b/samples/BindingDemo/MainWindow.xaml
index b583503327..4f0780b21f 100644
--- a/samples/BindingDemo/MainWindow.xaml
+++ b/samples/BindingDemo/MainWindow.xaml
@@ -4,7 +4,7 @@
         xmlns:vm="clr-namespace:BindingDemo.ViewModels" 
         xmlns:local="clr-namespace:BindingDemo"
         Title="AvaloniaUI Bindings Test"
-        Width="800"
+        Width="1000"
         Height="600"
         x:DataType="vm:MainWindowViewModel">
   <Window.Styles>
@@ -40,6 +40,10 @@
             <CheckBox IsChecked="{Binding !BooleanString}">!BooleanString</CheckBox>
             <CheckBox IsChecked="{Binding !!BooleanString}">!!BooleanString</CheckBox>
           </StackPanel>
+          <StackPanel Margin="18" Spacing="4" Width="200">
+            <TextBlock FontSize="16" Text="Markup Extensions"/>
+            <ComboBox Items="{local:EnumToEnumerable {x:Type vm:MainWindowViewModel+NestedEnum}}" />
+          </StackPanel>
         </StackPanel>
         <StackPanel Orientation="Horizontal">
           <StackPanel Margin="18" Spacing="4" Width="200" HorizontalAlignment="Left">
diff --git a/samples/BindingDemo/ViewModels/MainWindowViewModel.cs b/samples/BindingDemo/ViewModels/MainWindowViewModel.cs
index 18a7a01a69..c9cb2f3e57 100644
--- a/samples/BindingDemo/ViewModels/MainWindowViewModel.cs
+++ b/samples/BindingDemo/ViewModels/MainWindowViewModel.cs
@@ -115,5 +115,11 @@ namespace BindingDemo.ViewModels
         {
             return BooleanFlag;
         }
+
+        public enum NestedEnum
+        {
+            Nested,
+            Enum,
+        }
     }
 }