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Breaking change: WFDEV002 obsoletion is now an error
Learn about the breaking change in .NET 8 for Windows Forms where the compile-time diagnostic WFDEV002 has been promoted from a warning to an error.
01/30/2023

WFDEV002 obsoletion is now an error

The WFDEV002 obsoletion has been promoted from a warning to an error in .NET 8. Any reference to xref:System.Windows.Forms.DomainUpDown.DomainUpDownAccessibleObject will result in a compilation error that can't be suppressed. In addition, xref:System.Windows.Forms.DomainUpDown.CreateAccessibilityInstance?displayProperty=nameWithType now returns an object of the internal type UpDownBase.UpDownBaseAccessibleObject.

Version introduced

.NET 8 Preview 1

Previous behavior

Previously, if you referenced the xref:System.Windows.Forms.DomainUpDown.DomainUpDownAccessibleObject type, you got compile-time warning WFDEV002.

Also, xref:System.Windows.Forms.DomainUpDown.CreateAccessibilityInstance?displayProperty=nameWithType returned an object of type xref:System.Windows.Forms.DomainUpDown.DomainUpDownAccessibleObject.

New behavior

If you reference the xref:System.Windows.Forms.DomainUpDown.DomainUpDownAccessibleObject type, you'll get a compile-time error with the same diagnostic ID (WFDEV002).

In addition, since the type has been removed, xref:System.Windows.Forms.DomainUpDown.CreateAccessibilityInstance?displayProperty=nameWithType now returns an object of type UpDownBase.UpDownBaseAccessibleObject (which is an internal type).

Change category

This change can affect source compatibility.

Reason for change

The xref:System.Windows.Forms.DomainUpDown.DomainUpDownAccessibleObject class has always been documented as "internal use only". All functionality of the class was moved to the base class.

Recommended action

Update your code to use xref:System.Windows.Forms.Control.ControlAccessibleObject?displayProperty=nameWithType or xref:System.Windows.Forms.AccessibleObject instead of xref:System.Windows.Forms.DomainUpDown.DomainUpDownAccessibleObject.

Affected APIs

  • xref:System.Windows.Forms.DomainUpDown.DomainUpDownAccessibleObject?displayProperty=fullName
  • xref:System.Windows.Forms.DomainUpDown.CreateAccessibilityInstance?displayProperty=fullName