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Fix InvalidCastException in Control.OnHandleDestroyed for non-ControlAccessibleObject #14295

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Merged
LeafShi1 merged 4 commits into from
Mar 18, 2026
+20 −3
Merged

Fix InvalidCastException in Control.OnHandleDestroyed for non-ControlAccessibleObject #14295

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7bb70c5
Fix InvalidCastException in Control.OnHandleDestroyed for non-Control…
LeafShi1 Feb 12, 2026
4cb37bd
Add unit tests
LeafShi1 Feb 12, 2026
8aa399b
Removing extra blank line
LeafShi1 Feb 12, 2026
5d05194
Add assertion for test case "Control_OnHandleDestroyed_CustomAccessib…
LeafShi1 Feb 24, 2026
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8 changes: 5 additions & 3 deletions src/System.Windows.Forms/System/Windows/Forms/Control.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -7518,14 +7518,16 @@ protected virtual void OnHandleDestroyed(EventArgs e)
((EventHandler?)Events[s_handleDestroyedEvent])?.Invoke(this, e);

// The Accessibility Object for this Control
if (Properties.TryGetValue(s_accessibilityProperty, out ControlAccessibleObject? accObj))
if (Properties.TryGetValue(s_accessibilityProperty, out AccessibleObject? accObj)
&& accObj is ControlAccessibleObject controlAccObj)
{
accObj.Handle = IntPtr.Zero;
controlAccObj.Handle = IntPtr.Zero;
}

// Private accessibility object for control, used to wrap the object that
// OLEACC.DLL creates to represent the control's non-client (NC) region.
if (Properties.TryGetValue(s_ncAccessibilityProperty, out ControlAccessibleObject? nonClientAccessibleObject))
if (Properties.TryGetValue(s_ncAccessibilityProperty, out AccessibleObject? ncAccObj)
&& ncAccObj is ControlAccessibleObject nonClientAccessibleObject)
{
nonClientAccessibleObject.Handle = IntPtr.Zero;
}
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