PropertyGrid: PropertyGridView.OnMouseWheel - IndexOutOfRangeException

[ulfemsoy]

.NET version

.NET 9

Did it work in .NET Framework?

Not tested/verified

Did it work in any of the earlier releases of .NET Core or .NET 5+?

Not sure.

Issue description

System.IndexOutOfRangeException: Index was outside the bounds of the array.
at System.Windows.Forms.PropertyGridInternal.PropertyGridView.OnMouseWheel(MouseEventArgs e)
at System.Windows.Forms.Control.WmMouseWheel(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.PropertyGridInternal.PropertyGridView.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(HWND hWnd, MessageId msg, WPARAM wparam, LPARAM lparam)

Steps to reproduce

Not sure.

[Zheng-Li01]

@ulfemsoy could you please provide more details to help reproduce the issue, such as stable steps or sample project?

[ulfemsoy]

@Zheng-Li01:
The issue was found in the error log. I'm not sure how to re-create the issue.
The Exception is thrown on line 3193:

CommitValue(values[index]);

Cause:
The code does not check if the array is empty (zero length).

--

The array (which could be empty) is returned from (line 1464):

///

/// Returns the standard text values of this property.
///

public virtual object[] GetPropertyValueList()
{
if (TypeConverter.GetStandardValues(this) is { } values)
{
object[] valueArray = new object[values.Count];
values.CopyTo(valueArray, 0);
return valueArray;
}

  return []; // CAUSING THE EXCEPTION

}