feat: enhance IconDemo.

demo/Semi.Avalonia.Demo/ViewModels/IconDemoViewModel.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.ObjectModel;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+using Avalonia.Media;
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace Semi.Avalonia.Demo.ViewModels;
+
+public partial class IconDemoViewModel : ObservableObject
+{
+    private readonly IResourceDictionary? _resources =
+        AvaloniaXamlLoader.Load(new Uri("avares://Semi.Avalonia/Themes/Shared/Icon.axaml")) as ResourceDictionary;
+
+    public ObservableCollection<IconItem> Icons { get; set; } = [];
+
+    public void InitializeResources()
+    {
+        LoadIcons();
+    }
+
+    private void LoadIcons()
+    {
+        if (_resources is null) return;
+
+        foreach (var key in _resources.Keys)
+        {
+            if (_resources[key] is Geometry geometry)
+            {
+                var icon = new IconItem { ResourceKey = key.ToString(), Geometry = geometry };
+                Icons.Add(icon);
+            }
+        }
+    }
+}
+
+public class IconItem
+{
+    public string? ResourceKey { get; set; }
+    public Geometry? Geometry { get; set; }
+}