From f1f2f702c0d7420e61fefae97ee2dc2af8013da3 Mon Sep 17 00:00:00 2001
From: Andy Butland <abutland73@gmail.com>
Date: Wed, 15 Oct 2025 20:22:58 +0200
Subject: [PATCH] Restored and obsoleted removed extension method
 AsEnumerableOfOne.

---
 src/Umbraco.Core/Extensions/ObjectExtensions.cs   |  9 +++++++++
 .../CoreThings/ObjectExtensionsTests.cs           | 15 +++++++++++----
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/src/Umbraco.Core/Extensions/ObjectExtensions.cs b/src/Umbraco.Core/Extensions/ObjectExtensions.cs
index c53eee27a5..0497d2cec4 100644
--- a/src/Umbraco.Core/Extensions/ObjectExtensions.cs
+++ b/src/Umbraco.Core/Extensions/ObjectExtensions.cs
@@ -26,6 +26,15 @@ public static class ObjectExtensions
     private static readonly char[] _numberDecimalSeparatorsToNormalize = ['.', ','];
     private static readonly CustomBooleanTypeConverter _customBooleanTypeConverter = new();
 
+    /// <summary>
+    /// Returns an enumerable containing only the input object.
+    /// </summary>
+    /// <param name="input">The input object.</param>
+    /// <typeparam name="T">The type of the enumerable.</typeparam>
+    /// <returns>An enumerable containing only the input object.</returns>
+    [Obsolete("Please replace uses of this extension method with Enumerable.Repeat(input, 1). This extension method is no longer used in Umbraco and is scheduled for removal in Umbraco 19.")]
+    public static IEnumerable<T> AsEnumerableOfOne<T>(this T input) => Enumerable.Repeat(input, 1);
+
     /// <summary>
     /// Returns an XML serialized safe string representation for the value and type.
     /// </summary>
diff --git a/tests/Umbraco.Tests.UnitTests/Umbraco.Core/CoreThings/ObjectExtensionsTests.cs b/tests/Umbraco.Tests.UnitTests/Umbraco.Core/CoreThings/ObjectExtensionsTests.cs
index 1461364d02..38c233e2b9 100644
--- a/tests/Umbraco.Tests.UnitTests/Umbraco.Core/CoreThings/ObjectExtensionsTests.cs
+++ b/tests/Umbraco.Tests.UnitTests/Umbraco.Core/CoreThings/ObjectExtensionsTests.cs
@@ -1,11 +1,7 @@
 // Copyright (c) Umbraco.
 // See LICENSE for more details.
 
-using System;
-using System.Collections.Generic;
 using System.Globalization;
-using System.Linq;
-using System.Threading;
 using Microsoft.Extensions.Primitives;
 using NUnit.Framework;
 using Umbraco.Cms.Core.PropertyEditors;
@@ -31,6 +27,17 @@ public class ObjectExtensionsTests
 
     private CultureInfo _savedCulture;
 
+    [Test]
+    public void Can_Create_Enumerable_Of_One()
+    {
+        var input = "hello";
+#pragma warning disable CS0618 // Type or member is obsolete
+        var result = input.AsEnumerableOfOne<string>();
+#pragma warning restore CS0618 // Type or member is obsolete
+        Assert.AreEqual(1, result.Count());
+        Assert.AreEqual("hello", result.First());
+    }
+
     [Test]
     public void Can_Convert_List_To_Enumerable()
     {