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Bug Report T1240873
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Accessibility - NullReferenceException is thrown on DevExpress.Accessibility.ScrollBarAccessibleBase.GetIncName when a screen reader is used

created 9 months ago

Stack Trace:

Code
System.NullReferenceException: Object reference not set to an instance of an object.
at DevExpress.Accessibility.ScrollBarAccessibleBase.GetIncName()
at DevExpress.Accessibility.ScrollBarAccessibleBase.OnChildrenCountChanged()
at DevExpress.Accessibility.BaseAccessible.<FindAccessibleCore>d__86.MoveNext()
at System.Linq.Enumerable.Count[TSource](IEnumerable1 source)    at DevExpress.Accessibility.BaseAccessible.<FindAccessibleCore>d__86.MoveNext()    at System.Linq.Enumerable.Count[TSource](IEnumerable1 source)
at DevExpress.Accessibility.BaseAccessible.<FindAccessibleCore>d__86.MoveNext()
at System.Linq.Enumerable.Count[TSource](IEnumerable1 source)    at DevExpress.Accessibility.BaseAccessible.<FindAccessibleCore>d__86.MoveNext()    at System.Linq.Enumerable.Count[TSource](IEnumerable1 source)
at DevExpress.Accessibility.BaseAccessible.<FindAccessibleCore>d__86.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)
at DevExpress.XtraLayout.LayoutControl.AccessibleNotifyClients(AccessibleEvents events, BaseLayoutItem baseLayoutItem)
at DevExpress.XtraLayout.Helpers.FocusHelperBase.set_SelectedComponent(Component value)
at DevExpress.XtraLayout.LayoutControlItem.OnControlGotFocus(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnGotFocus(EventArgs e)
at DevExpress.XtraEditors.BaseEdit.OnGotFocus(EventArgs e)
at DevExpress.XtraEditors.TextEdit.OnGotFocus(EventArgs e)
at DevExpress.XtraEditors.PopupBaseEdit.OnGotFocus(EventArgs e)
at System.Windows.Forms.Control.OnGotFocus(EventArgs e)
at System.Windows.Forms.TextBox.OnGotFocus(EventArgs e)
at DevExpress.XtraEditors.TextBoxMaskBox.OnGotFocus(EventArgs e)
at System.Windows.Forms.Control.InvokeGotFocus(Control toInvoke, EventArgs e)
at System.Windows.Forms.Control.WmSetFocus(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.TextBox.WndProc(Message& m)
at DevExpress.XtraEditors.Mask.MaskBox.MaskStrategy.ManagedStrategy.DoWndProc(Message& m)
at DevExpress.XtraEditors.Mask.MaskBox.WndProc(Message& m)
at DevExpress.XtraEditors.TextBoxMaskBox.WndProc(Message& msg)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
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Answers approved by DevExpress Support

created 9 months ago

We have addressed the issue described in this ticket and will include a fix in our next maintenance update. Should you need to apply our fix prior to official release, you can request a hotfix here.

Important Notes:

  • Hotfixes may be unavailable for Early Access/Beta builds or updates set for release within a week.
  • .NET only: in the NuGet Package Manager, use your personal NuGet feed and check the "Include prerelease" option to view the hotfix package in the "Updates" tab.
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