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Windows Forms in .NET 11 Preview 5 - Release Notes

.NET 11 Preview 5 does not introduce new Windows Forms feature additions. The notable user-facing changes in this preview are regression fixes for clipboard, ToolStrip, layout, designer, and dark mode scenarios.

Bug fixes

  • System.Windows.Forms.Clipboard
    • Clipboard.GetText(TextDataFormat.Rtf) now reads RTF clipboard data that doesn't include a null terminator. This fixes valid RTF content copied by applications such as PowerPoint returning an empty string (dotnet/winforms #14461).
  • System.Windows.Forms.ToolStrip
    • ToolStrip controls with TabStop=true no longer activate menu handling after tab navigation in a way that prevents controls such as TreeView from receiving arrow keys (dotnet/winforms #14491).
    • ToolStripDropDownMenu scrolling now handles menu boundaries without out-of-range scrolling or unintentionally dismissing the dropdown (dotnet/winforms #14490).
    • ToolStrip DPI changes now preserve the previous device DPI during the DPI change path, so scaling logic can run when moving controls between displays with different DPI settings (dotnet/winforms #14454).
  • System.Windows.Forms.Layout
    • AnchorLayoutV2 now initializes missing anchor metadata when anchored controls are replaced during a suspended layout pass (dotnet/winforms #14505).
  • System.Windows.Forms.Design
    • Hosted WinForms designers can paste controls through CommandSet.OnMenuPaste again (dotnet/winforms #14403).
    • Collection editor captions for custom controls now use the underlying control type instead of the generated ControlProxy<T> wrapper name (dotnet/winforms #14375).
  • System.Windows.Forms.PropertyGrid
  • System.Windows.Forms.ProgressBar
    • ProgressBar now has default foreground and background colors for dark mode rendering (dotnet/winforms #14339).