Fixing DataGridView's scrollbars shouldn't include their control type in their accessible names (#3038)

* ScrollBar accessible object class
* Accessible objects for scroll bar child classes
* Added unit tests for new accessible objects

src/System.Windows.Forms/src/PublicAPI.Unshipped.txt

@@ -7,3 +7,6 @@ System.Windows.Forms.ListViewGroup.TitleImageKey.set -> void
 ~System.Windows.Forms.ListView.GroupImageList.get -> System.Windows.Forms.ImageList
 ~System.Windows.Forms.ListView.GroupImageList.set -> void
 ~override System.Windows.Forms.PictureBox.CreateAccessibilityInstance() -> System.Windows.Forms.AccessibleObject
+override System.Windows.Forms.HScrollBar.CreateAccessibilityInstance() -> System.Windows.Forms.AccessibleObject!
+override System.Windows.Forms.ScrollBar.CreateAccessibilityInstance() -> System.Windows.Forms.AccessibleObject!
+override System.Windows.Forms.VScrollBar.CreateAccessibilityInstance() -> System.Windows.Forms.AccessibleObject!

src/System.Windows.Forms/src/Resources/SR.resx

@@ -6647,6 +6647,12 @@ Stack trace where the illegal operation occurred was:
   <data name="TaskDialogCanUpdateStateOnlyWhenShown" xml:space="preserve">
     <value>Can only update the state of a task dialog while it is shown.</value>
   </data>
+  <data name="HScrollBarDefaultAccessibleName" xml:space="preserve">
+    <value>Horizontal</value>
+  </data>
+  <data name="VScrollBarDefaultAccessibleName" xml:space="preserve">
+    <value>Vertical</value>
+  </data>
   <data name="TaskDialogCollectionAlreadyBound" xml:space="preserve">
     <value>One of the collections of this {0} is already bound to a {1} instance.</value>
   </data>

src/System.Windows.Forms/src/Resources/xlf/SR.cs.xlf

@@ -5427,6 +5427,11 @@ Chcete jej nahradit?</target>
         <target state="translated">Počet řádků v tabulce</target>
         <note />
       </trans-unit>
+      <trans-unit id="HScrollBarDefaultAccessibleName">
+        <source>Horizontal</source>
+        <target state="new">Horizontal</target>
+        <note />
+      </trans-unit>
       <trans-unit id="HandleAlreadyExists">
         <source>Window handle already exists.</source>
         <target state="translated">Popisovač okna již existuje.</target>
@@ -10791,6 +10796,11 @@ Trasování zásobníku, kde došlo k neplatné operaci:
         <target state="translated">Vyvolá se při každém načtení uživatelského ovládacího prvku.</target>
         <note />
       </trans-unit>
+      <trans-unit id="VScrollBarDefaultAccessibleName">
+        <source>Vertical</source>
+        <target state="new">Vertical</target>
+        <note />
+      </trans-unit>
       <trans-unit id="VisualStyleHandleCreationFailed">
         <source>Visual Style handle creation operation did not succeed.</source>
         <target state="translated">Operace vytvoření popisovače vizuálního stylu se nezdařila.</target>

src/System.Windows.Forms/src/Resources/xlf/SR.de.xlf

@@ -5427,6 +5427,11 @@ Möchten Sie sie ersetzen?</target>
         <target state="translated">Die Anzahl der Zeilen für die Tabelle.</target>
         <note />
       </trans-unit>
+      <trans-unit id="HScrollBarDefaultAccessibleName">
+        <source>Horizontal</source>
+        <target state="new">Horizontal</target>
+        <note />
+      </trans-unit>
       <trans-unit id="HandleAlreadyExists">
         <source>Window handle already exists.</source>
         <target state="translated">Der Fensterhandle ist bereits vorhanden.</target>
@@ -10791,6 +10796,11 @@ Stapelüberwachung, in der der unzulässige Vorgang auftrat:
         <target state="translated">Tritt ein, wenn das Benutzersteuerelement geladen wird.</target>
         <note />
       </trans-unit>
+      <trans-unit id="VScrollBarDefaultAccessibleName">
+        <source>Vertical</source>
+        <target state="new">Vertical</target>
+        <note />
+      </trans-unit>
       <trans-unit id="VisualStyleHandleCreationFailed">
         <source>Visual Style handle creation operation did not succeed.</source>
         <target state="translated">Fehler beim Erstellen eines Visual Style-Handles.</target>

src/System.Windows.Forms/src/Resources/xlf/SR.es.xlf

@@ -5427,6 +5427,11 @@ Do you want to replace it?</source>
         <target state="translated">Número de filas de la tabla.</target>
         <note />
       </trans-unit>
+      <trans-unit id="HScrollBarDefaultAccessibleName">
+        <source>Horizontal</source>
+        <target state="new">Horizontal</target>
+        <note />
+      </trans-unit>
       <trans-unit id="HandleAlreadyExists">
         <source>Window handle already exists.</source>
         <target state="translated">Ya existe el identificador de ventana.</target>
@@ -10791,6 +10796,11 @@ El seguimiento de la pila donde tuvo lugar la operación no válida fue:
         <target state="translated">Tiene lugar siempre que se carga el control de usuario.</target>
         <note />
       </trans-unit>
+      <trans-unit id="VScrollBarDefaultAccessibleName">
+        <source>Vertical</source>
+        <target state="new">Vertical</target>
+        <note />
+      </trans-unit>
       <trans-unit id="VisualStyleHandleCreationFailed">
         <source>Visual Style handle creation operation did not succeed.</source>
         <target state="translated">Error en la operación de creación de un identificador de Visual Style.</target>

src/System.Windows.Forms/src/Resources/xlf/SR.fr.xlf

@@ -5427,6 +5427,11 @@ Voulez-vous le remplacer ?</target>
         <target state="translated">Nombre de ligne de la table.</target>
         <note />
       </trans-unit>
+      <trans-unit id="HScrollBarDefaultAccessibleName">
+        <source>Horizontal</source>
+        <target state="new">Horizontal</target>
+        <note />
+      </trans-unit>
       <trans-unit id="HandleAlreadyExists">
         <source>Window handle already exists.</source>
         <target state="translated">Le handle de fenêtre existe déjà.</target>
@@ -10791,6 +10796,11 @@ Cette opération non conforme s'est produite sur la trace de la pile :
         <target state="translated">Se produit lors du chargement du contrôle utilisateur.</target>
         <note />
       </trans-unit>
+      <trans-unit id="VScrollBarDefaultAccessibleName">
+        <source>Vertical</source>
+        <target state="new">Vertical</target>
+        <note />
+      </trans-unit>
       <trans-unit id="VisualStyleHandleCreationFailed">
         <source>Visual Style handle creation operation did not succeed.</source>
         <target state="translated">Échec de l'opération de création de handle de style visuel.</target>

src/System.Windows.Forms/src/Resources/xlf/SR.it.xlf

@@ -5427,6 +5427,11 @@ Sostituirlo?</target>
         <target state="translated">Il numero di righe nella tabella.</target>
         <note />
       </trans-unit>
+      <trans-unit id="HScrollBarDefaultAccessibleName">
+        <source>Horizontal</source>
+        <target state="new">Horizontal</target>
+        <note />
+      </trans-unit>
       <trans-unit id="HandleAlreadyExists">
         <source>Window handle already exists.</source>
         <target state="translated">Handle di finestra già esistente.</target>
@@ -10791,6 +10796,11 @@ Traccia dello stack da cui si è verificata l'operazione non valida:
         <target state="translated">Generato quando viene caricato il controllo utente.</target>
         <note />
       </trans-unit>
+      <trans-unit id="VScrollBarDefaultAccessibleName">
+        <source>Vertical</source>
+        <target state="new">Vertical</target>
+        <note />
+      </trans-unit>
       <trans-unit id="VisualStyleHandleCreationFailed">
         <source>Visual Style handle creation operation did not succeed.</source>
         <target state="translated">Operazione di creazione handle per uno stile di visualizzazione non riuscita.</target>

src/System.Windows.Forms/src/Resources/xlf/SR.ja.xlf

@@ -5427,6 +5427,11 @@ Do you want to replace it?</source>
         <target state="translated">テーブルの行数です。</target>
         <note />
       </trans-unit>
+      <trans-unit id="HScrollBarDefaultAccessibleName">
+        <source>Horizontal</source>
+        <target state="new">Horizontal</target>
+        <note />
+      </trans-unit>
       <trans-unit id="HandleAlreadyExists">
         <source>Window handle already exists.</source>
         <target state="translated">ウィンドウ ハンドルは既に存在します。</target>
@@ -10791,6 +10796,11 @@ Stack trace where the illegal operation occurred was:
         <target state="translated">ユーザー コントロールを読み込むときに発生します。</target>
         <note />
       </trans-unit>
+      <trans-unit id="VScrollBarDefaultAccessibleName">
+        <source>Vertical</source>
+        <target state="new">Vertical</target>
+        <note />
+      </trans-unit>
       <trans-unit id="VisualStyleHandleCreationFailed">
         <source>Visual Style handle creation operation did not succeed.</source>
         <target state="translated">Visual スタイル ハンドルを作成することができませんでした。</target>

src/System.Windows.Forms/src/Resources/xlf/SR.ko.xlf

@@ -5427,6 +5427,11 @@ Do you want to replace it?</source>
         <target state="translated">테이블의 행 개수입니다.</target>
         <note />
       </trans-unit>
+      <trans-unit id="HScrollBarDefaultAccessibleName">
+        <source>Horizontal</source>
+        <target state="new">Horizontal</target>
+        <note />
+      </trans-unit>
       <trans-unit id="HandleAlreadyExists">
         <source>Window handle already exists.</source>
         <target state="translated">창 핸들이 이미 있습니다.</target>
@@ -10791,6 +10796,11 @@ Stack trace where the illegal operation occurred was:
         <target state="translated">사용자 정의 컨트롤이 로드될 때마다 발생합니다.</target>
         <note />
       </trans-unit>
+      <trans-unit id="VScrollBarDefaultAccessibleName">
+        <source>Vertical</source>
+        <target state="new">Vertical</target>
+        <note />
+      </trans-unit>
       <trans-unit id="VisualStyleHandleCreationFailed">
         <source>Visual Style handle creation operation did not succeed.</source>
         <target state="translated">비주얼 스타일 핸들을 만들지 못했습니다.</target>

src/System.Windows.Forms/src/Resources/xlf/SR.pl.xlf

@@ -5427,6 +5427,11 @@ Czy chcesz go zamienić?</target>
         <target state="translated">Liczba wierszy w tabeli.</target>
         <note />
       </trans-unit>
+      <trans-unit id="HScrollBarDefaultAccessibleName">
+        <source>Horizontal</source>
+        <target state="new">Horizontal</target>
+        <note />
+      </trans-unit>
       <trans-unit id="HandleAlreadyExists">
         <source>Window handle already exists.</source>
         <target state="translated">Uchwyt okna już istnieje.</target>
@@ -10791,6 +10796,11 @@ Stos śledzenia, w którym wystąpiła zabroniona operacja:
         <target state="translated">Występuje za każdym razem, gdy jest ładowany formant użytkownika.</target>
         <note />
       </trans-unit>
+      <trans-unit id="VScrollBarDefaultAccessibleName">
+        <source>Vertical</source>
+        <target state="new">Vertical</target>
+        <note />
+      </trans-unit>
       <trans-unit id="VisualStyleHandleCreationFailed">
         <source>Visual Style handle creation operation did not succeed.</source>
         <target state="translated">Operacja utworzenia uchwytu elementu Visual Style nie powiodła się.</target>

src/System.Windows.Forms/src/Resources/xlf/SR.pt-BR.xlf

@@ -5427,6 +5427,11 @@ Deseja substituí-lo?</target>
         <target state="translated">O número de linhas na tabela.</target>
         <note />
       </trans-unit>
+      <trans-unit id="HScrollBarDefaultAccessibleName">
+        <source>Horizontal</source>
+        <target state="new">Horizontal</target>
+        <note />
+      </trans-unit>
       <trans-unit id="HandleAlreadyExists">
         <source>Window handle already exists.</source>
         <target state="translated">O identificador de janela já existe.</target>
@@ -10791,6 +10796,11 @@ Rastreamento de pilha em que a operação ilegal ocorreu:
         <target state="translated">Ocorre sempre que o controle de usuário é carregado.</target>
         <note />
       </trans-unit>
+      <trans-unit id="VScrollBarDefaultAccessibleName">
+        <source>Vertical</source>
+        <target state="new">Vertical</target>
+        <note />
+      </trans-unit>
       <trans-unit id="VisualStyleHandleCreationFailed">
         <source>Visual Style handle creation operation did not succeed.</source>
         <target state="translated">Falha na operação de criação de alça de Estilo Visual.</target>

src/System.Windows.Forms/src/Resources/xlf/SR.ru.xlf

@@ -5428,6 +5428,11 @@ Do you want to replace it?</source>
         <target state="translated">Число строк в таблице.</target>
         <note />
       </trans-unit>
+      <trans-unit id="HScrollBarDefaultAccessibleName">
+        <source>Horizontal</source>
+        <target state="new">Horizontal</target>
+        <note />
+      </trans-unit>
       <trans-unit id="HandleAlreadyExists">
         <source>Window handle already exists.</source>
         <target state="translated">Дескриптор окна уже существует.</target>
@@ -10792,6 +10797,11 @@ Stack trace where the illegal operation occurred was:
         <target state="translated">Происходит при каждой загрузке пользовательского элемента управления.</target>
         <note />
       </trans-unit>
+      <trans-unit id="VScrollBarDefaultAccessibleName">
+        <source>Vertical</source>
+        <target state="new">Vertical</target>
+        <note />
+      </trans-unit>
       <trans-unit id="VisualStyleHandleCreationFailed">
         <source>Visual Style handle creation operation did not succeed.</source>
         <target state="translated">Операция создания дескриптора Visual Style не удалась.</target>

src/System.Windows.Forms/src/Resources/xlf/SR.tr.xlf

@@ -5427,6 +5427,11 @@ Bunu değiştirmek istiyor musunuz?</target>
         <target state="translated">Tablodaki satır sayısı.</target>
         <note />
       </trans-unit>
+      <trans-unit id="HScrollBarDefaultAccessibleName">
+        <source>Horizontal</source>
+        <target state="new">Horizontal</target>
+        <note />
+      </trans-unit>
       <trans-unit id="HandleAlreadyExists">
         <source>Window handle already exists.</source>
         <target state="translated">Pencere işleyicisi zaten var.</target>
@@ -10791,6 +10796,11 @@ Geçersiz işlemin gerçekleştiği yığın izi:
         <target state="translated">Kullanıcı denetimi her yüklendiğinde gerçekleşir.</target>
         <note />
       </trans-unit>
+      <trans-unit id="VScrollBarDefaultAccessibleName">
+        <source>Vertical</source>
+        <target state="new">Vertical</target>
+        <note />
+      </trans-unit>
       <trans-unit id="VisualStyleHandleCreationFailed">
         <source>Visual Style handle creation operation did not succeed.</source>
         <target state="translated">Görsel Stil işleyicisi oluşturma işlemi başarısız oldu.</target>

src/System.Windows.Forms/src/Resources/xlf/SR.zh-Hans.xlf

@@ -5427,6 +5427,11 @@ Do you want to replace it?</source>
         <target state="translated">表中的行数。</target>
         <note />
       </trans-unit>
+      <trans-unit id="HScrollBarDefaultAccessibleName">
+        <source>Horizontal</source>
+        <target state="new">Horizontal</target>
+        <note />
+      </trans-unit>
       <trans-unit id="HandleAlreadyExists">
         <source>Window handle already exists.</source>
         <target state="translated">窗口句柄已存在。</target>
@@ -10791,6 +10796,11 @@ Stack trace where the illegal operation occurred was:
         <target state="translated">每当用户控件加载时发生。</target>
         <note />
       </trans-unit>
+      <trans-unit id="VScrollBarDefaultAccessibleName">
+        <source>Vertical</source>
+        <target state="new">Vertical</target>
+        <note />
+      </trans-unit>
       <trans-unit id="VisualStyleHandleCreationFailed">
         <source>Visual Style handle creation operation did not succeed.</source>
         <target state="translated">视觉样式句柄创建操作失败。</target>

src/System.Windows.Forms/src/Resources/xlf/SR.zh-Hant.xlf

@@ -5427,6 +5427,11 @@ Do you want to replace it?</source>
         <target state="translated">資料表中的資料列數目。</target>
         <note />
       </trans-unit>
+      <trans-unit id="HScrollBarDefaultAccessibleName">
+        <source>Horizontal</source>
+        <target state="new">Horizontal</target>
+        <note />
+      </trans-unit>
       <trans-unit id="HandleAlreadyExists">
         <source>Window handle already exists.</source>
         <target state="translated">視窗控制代碼已經存在。</target>
@@ -10791,6 +10796,11 @@ Stack trace where the illegal operation occurred was:
         <target state="translated">載入使用者控制項時發生。</target>
         <note />
       </trans-unit>
+      <trans-unit id="VScrollBarDefaultAccessibleName">
+        <source>Vertical</source>
+        <target state="new">Vertical</target>
+        <note />
+      </trans-unit>
       <trans-unit id="VisualStyleHandleCreationFailed">
         <source>Visual Style handle creation operation did not succeed.</source>
         <target state="translated">視覺化樣式控制代碼建立作業失敗。</target>

src/System.Windows.Forms/src/System/Windows/Forms/HScrollBar.HScrollBarAccessibleObject.cs

@@ -0,0 +1,27 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace System.Windows.Forms
+{
+    public partial class HScrollBar
+    {
+        internal class HScrollBarAccessibleObject : ScrollBarAccessibleObject
+        {
+            internal HScrollBarAccessibleObject(HScrollBar owner) : base(owner)
+            {
+            }
+
+            public override string Name
+            {
+                get => base.Name ?? SR.HScrollBarDefaultAccessibleName;
+            }
+        }
+    }
+}

src/System.Windows.Forms/src/System/Windows/Forms/HScrollBar.cs

@@ -12,7 +12,7 @@ namespace System.Windows.Forms
     ///  Represents a standard Windows horizontal scroll bar.
     /// </summary>
     [SRDescription(nameof(SR.DescriptionHScrollBar))]
-    public class HScrollBar : ScrollBar
+    public partial class HScrollBar : ScrollBar
     {
         protected override CreateParams CreateParams
         {
@@ -24,6 +24,10 @@ namespace System.Windows.Forms
             }
         }
 
-        protected override Size DefaultSize => new Size(80, SystemInformation.HorizontalScrollBarHeight);
+        protected override Size DefaultSize
+            => new Size(80, SystemInformation.HorizontalScrollBarHeight);
+
+        protected override AccessibleObject CreateAccessibilityInstance()
+            => new HScrollBarAccessibleObject(this);
     }
 }

src/System.Windows.Forms/src/System/Windows/Forms/ScrollBar.ScrollBarAccessibleObject.cs

@@ -0,0 +1,49 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using static Interop;
+
+namespace System.Windows.Forms
+{
+    public partial class ScrollBar
+    {
+        internal class ScrollBarAccessibleObject : ControlAccessibleObject
+        {
+            private ScrollBar _owningScrollBar;
+
+            internal ScrollBarAccessibleObject(ScrollBar owner) : base(owner)
+            {
+                _owningScrollBar = owner;
+            }
+
+            internal override bool IsIAccessibleExSupported() => true;
+
+            internal override bool IsPatternSupported(UiaCore.UIA patternId)
+            {
+                if (patternId == UiaCore.UIA.ValuePatternId)
+                {
+                    return true;
+                }
+
+                return base.IsPatternSupported(patternId);
+            }
+
+            internal override object? GetPropertyValue(UiaCore.UIA propertyID)
+                => propertyID switch
+                {
+                    UiaCore.UIA.NamePropertyId => Name,
+                    UiaCore.UIA.AutomationIdPropertyId => _owningScrollBar.Name,
+                    UiaCore.UIA.ControlTypePropertyId => UiaCore.UIA.ScrollBarControlTypeId,
+                    UiaCore.UIA.IsKeyboardFocusablePropertyId => true,
+                    UiaCore.UIA.IsValuePatternAvailablePropertyId => IsPatternSupported(UiaCore.UIA.ValuePatternId),
+                    _ => base.GetPropertyValue(propertyID)
+                };
+        }
+    }
+}

src/System.Windows.Forms/src/System/Windows/Forms/ScrollBar.cs

@@ -14,7 +14,7 @@ namespace System.Windows.Forms
     /// </summary>
     [DefaultProperty(nameof(Value))]
     [DefaultEvent(nameof(Scroll))]
-    public abstract class ScrollBar : Control
+    public abstract partial class ScrollBar : Control
     {
         private static readonly object s_scrollEvent = new object();
         private static readonly object s_valueChangedEvent = new object();
@@ -738,5 +738,15 @@ namespace System.Windows.Forms
                     break;
             }
         }
+
+        /// <summary>
+        ///  Creates a new AccessibleObject for this <see cref='ScrollBar'/> instance.
+        ///  The AccessibleObject instance returned by this method supports ControlType UIA property.
+        /// </summary>
+        /// <returns>
+        ///  AccessibleObject for this <see cref='ScrollBar'/> instance.
+        /// </returns>
+        protected override AccessibleObject CreateAccessibilityInstance()
+            => new ScrollBarAccessibleObject(this);
     }
 }

src/System.Windows.Forms/src/System/Windows/Forms/VScrollBar.VScrollBarAccessibleObject.cs

@@ -0,0 +1,27 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace System.Windows.Forms
+{
+    public partial class VScrollBar
+    {
+        internal class VScrollBarAccessibleObject : ScrollBarAccessibleObject
+        {
+            internal VScrollBarAccessibleObject(VScrollBar owner) : base(owner)
+            {
+            }
+
+            public override string Name
+            {
+                get => base.Name ?? SR.VScrollBarDefaultAccessibleName;
+            }
+        }
+    }
+}

src/System.Windows.Forms/src/System/Windows/Forms/VScrollBar.cs

@@ -13,7 +13,7 @@ namespace System.Windows.Forms
     ///  Represents a standard Windows vertical scroll bar.
     /// </summary>
     [SRDescription(nameof(SR.DescriptionVScrollBar))]
-    public class VScrollBar : ScrollBar
+    public partial class VScrollBar : ScrollBar
     {
         private const int DefaultHeight = 80;
 
@@ -55,5 +55,8 @@ namespace System.Windows.Forms
             add => base.RightToLeftChanged += value;
             remove => base.RightToLeftChanged -= value;
         }
+
+        protected override AccessibleObject CreateAccessibilityInstance()
+            => new VScrollBarAccessibleObject(this);
     }
 }

src/System.Windows.Forms/tests/UnitTests/HScrollBar.HScrollBarAccessibleObjectTests.cs

@@ -0,0 +1,46 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace System.Windows.Forms.Tests
+{
+    public class HScrollBar_HScrollBarAccessibleObjectTests :
+        IClassFixture<ThreadExceptionFixture>
+    {
+        [WinFormsFact]
+        public void HScrollBarAccessibleObject_ctor_ThrowsException_IfHScrollBarAccessibleObjectIsNull()
+        {
+            Assert.Throws<ArgumentNullException>(() => new HScrollBar.HScrollBarAccessibleObject(null));
+        }
+
+        [WinFormsFact]
+        public void HScrollBarAccessibleObject_Ctor_Default()
+        {
+            using var horScrollBar = new HScrollBar();
+            AccessibleObject accessibleObject = horScrollBar.AccessibilityObject;
+
+            Assert.NotNull(accessibleObject);
+            Assert.Equal(AccessibleRole.ScrollBar, accessibleObject.Role);
+            // TODO: ControlAccessibleObject shouldn't force handle creation, tracked in https://github.com/dotnet/winforms/issues/3062
+            Assert.True(horScrollBar.IsHandleCreated);
+        }
+
+        [WinFormsFact]
+        public void HScrollBarAccessibleObject_Name_Get_ReturnsExpected()
+        {
+            using var horScrollBar = new HScrollBar();
+            HScrollBar.HScrollBarAccessibleObject accessibleObject =
+                Assert.IsType<HScrollBar.HScrollBarAccessibleObject>(horScrollBar.AccessibilityObject);
+            Assert.Equal("Horizontal", accessibleObject.Name);
+            // TODO: ControlAccessibleObject shouldn't force handle creation, tracked in https://github.com/dotnet/winforms/issues/3062
+            Assert.True(horScrollBar.IsHandleCreated);
+        }
+    }
+}

src/System.Windows.Forms/tests/UnitTests/ScrollBar.ScrollBarAccessibleObjectTests.cs

@@ -0,0 +1,77 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Xunit;
+using static Interop.UiaCore;
+
+namespace System.Windows.Forms.Tests
+{
+    public class ScrollBar_ScrollBarAccessibleObjectTests :
+        IClassFixture<ThreadExceptionFixture>
+    {
+        [WinFormsFact]
+        public void ScrollBarAccessibleObject_ctor_ThrowsException_IfScrollBarAccessibleObjectIsNull()
+        {
+            Assert.Throws<ArgumentNullException>(() => new ScrollBar.ScrollBarAccessibleObject(null));
+        }
+
+        [WinFormsFact]
+        public void ScrollBarAccessibleObject_Ctor_Default()
+        {
+            using var scrollBar = new SubScrollBar();
+            AccessibleObject accessibleObject = scrollBar.AccessibilityObject;
+
+            Assert.NotNull(accessibleObject);
+            Assert.Equal(AccessibleRole.ScrollBar, accessibleObject.Role);
+            // TODO: ControlAccessibleObject shouldn't force handle creation, tracked in https://github.com/dotnet/winforms/issues/3062
+            Assert.True(scrollBar.IsHandleCreated);
+        }
+
+        [WinFormsFact]
+        public void ScrollBarAccessibleObject_IsPatternSupported_Invoke_ReturnsExpected()
+        {
+            using var scrollBar = new SubScrollBar();
+            AccessibleObject accessibleObject = scrollBar.AccessibilityObject;
+
+            Assert.True(accessibleObject.IsPatternSupported(UIA.ValuePatternId));
+            // TODO: ControlAccessibleObject shouldn't force handle creation, tracked in https://github.com/dotnet/winforms/issues/3062
+            Assert.True(scrollBar.IsHandleCreated);
+        }
+
+        [WinFormsTheory]
+        [InlineData((int)UIA.NamePropertyId, "TestName")]
+        [InlineData((int)UIA.ControlTypePropertyId, UIA.ScrollBarControlTypeId)]
+        [InlineData((int)UIA.IsKeyboardFocusablePropertyId, true)]
+        [InlineData((int)UIA.IsValuePatternAvailablePropertyId, true)]
+        [InlineData((int)UIA.AutomationIdPropertyId, "AutomId")]
+        public void ScrollBarAccessibleObject_GetPropertyValue_Invoke_ReturnsExpected(int propertyID, object expected)
+        {
+            using var scrollBar = new SubScrollBar
+            {
+                AccessibleName = "TestName",
+                Name = "AutomId"
+            };
+
+            Assert.False(scrollBar.IsHandleCreated);
+            var scrollBarAccessibleObject = new ScrollBar.ScrollBarAccessibleObject(scrollBar);
+            object value = scrollBarAccessibleObject.GetPropertyValue((UIA)propertyID);
+
+            Assert.Equal(expected, value);
+            // TODO: ControlAccessibleObject shouldn't force handle creation, tracked in https://github.com/dotnet/winforms/issues/3062
+            Assert.True(scrollBar.IsHandleCreated);
+        }
+
+        private class SubScrollBar : ScrollBar
+        {
+            public SubScrollBar() : base()
+            {
+            }
+        }
+    }
+}

src/System.Windows.Forms/tests/UnitTests/VScrollBar.VScrollBarAccessibleObjectTests.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace System.Windows.Forms.Tests
+{
+    public class VScrollBar_VScrollBarAccessibleObjectTests :
+        IClassFixture<ThreadExceptionFixture>
+    {
+        [WinFormsFact]
+        public void VScrollBarAccessibleObject_ctor_ThrowsException_IfVScrollBarAccessibleObjectIsNull()
+        {
+            Assert.Throws<ArgumentNullException>(() => new VScrollBar.VScrollBarAccessibleObject(null));
+        }
+
+        [WinFormsFact]
+        public void VScrollBarAccessibleObject_Ctor_Default()
+        {
+            using var vertScrollBar = new VScrollBar();
+            AccessibleObject accessibleObject = vertScrollBar.AccessibilityObject;
+
+            Assert.NotNull(accessibleObject);
+            Assert.Equal(AccessibleRole.ScrollBar, accessibleObject.Role);
+            // TODO: ControlAccessibleObject shouldn't force handle creation, tracked in https://github.com/dotnet/winforms/issues/3062
+            Assert.True(vertScrollBar.IsHandleCreated);
+        }
+
+        [WinFormsFact]
+        public void VScrollBarAccessibleObject_Name_Get_ReturnsExpected()
+        {
+            using var vertScrollBar = new VScrollBar();
+            VScrollBar.VScrollBarAccessibleObject accessibleObject
+                = Assert.IsType<VScrollBar.VScrollBarAccessibleObject>(vertScrollBar.AccessibilityObject);
+            Assert.Equal("Vertical", accessibleObject.Name);
+            // TODO: ControlAccessibleObject shouldn't force handle creation, tracked in https://github.com/dotnet/winforms/issues/3062
+            Assert.True(vertScrollBar.IsHandleCreated);
+        }
+    }
+}