From 1fcabca32809d3a33a204eb1978e00ceefa2fbac Mon Sep 17 00:00:00 2001
From: Dan Walmsley <dan@walms.co.uk>
Date: Thu, 6 Mar 2025 13:51:31 +0000
Subject: [PATCH] add a benchmark for inherited property change notifications.

---
 .../Data/InheritedProperties.cs               | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 tests/Avalonia.Benchmarks/Data/InheritedProperties.cs

diff --git a/tests/Avalonia.Benchmarks/Data/InheritedProperties.cs b/tests/Avalonia.Benchmarks/Data/InheritedProperties.cs
new file mode 100644
index 0000000000..2579a228c9
--- /dev/null
+++ b/tests/Avalonia.Benchmarks/Data/InheritedProperties.cs
@@ -0,0 +1,46 @@
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using Avalonia.Controls;
+using Avalonia.UnitTests;
+using BenchmarkDotNet.Attributes;
+
+namespace Avalonia.Benchmarks.Data;
+
+[MemoryDiagnoser]
+public class InheritedProperties
+{
+    private readonly TestRoot _root;
+    private readonly List<Control> _controls = new();
+
+    public InheritedProperties()
+    {
+        var panel = new StackPanel();
+
+        _root = new TestRoot
+        {
+            Child = panel,
+            Renderer = new NullRenderer()
+        };
+
+        _controls.Add(panel);
+        _controls = ControlHierarchyCreator.CreateChildren(_controls, panel, 3, 5, 5);
+
+        _root.LayoutManager.ExecuteInitialLayoutPass();
+    }
+    
+    [Benchmark, MethodImpl(MethodImplOptions.NoInlining)]
+    public void ChangeDataContext()
+    {
+        TestDataContext[] dataContexts = [new(), new(), new()];
+            
+        for (int i = 0; i < 100; i++)
+        {
+            for (int j = 0; j < dataContexts.Length; j++)
+            {
+                _root.DataContext = dataContexts[j];
+            }
+        }
+    }
+
+    public class TestDataContext;
+}