DevExpress WPF 版本發佈

AI Agent Skills

• v26.1 introduces Agent Skills for DevExpress WPF Controls, structured knowledge packages that equip AI coding assistants with accurate, product-specific expertise for WPF controls.
• Each skill defines the correct NuGet packages, entry-point classes, API patterns, XAML markup, and configuration for a specific WPF control or usage scenario. AI assistants use this knowledge to generate accurate WPF code from the first prompt.
• Skills follow the open Agent Skills standard and work with Claude Code, GitHub Copilot (CLI, VS Code, Visual Studio, JetBrains Rider), Cursor, and Gemini CLI.

Fluent Theme (CTP)

• v26.1 introduces a new Fluent Light Theme for DevExpress-powered WPF applications. The new theme incorporates modern design practices inspired by the latest Microsoft 365 applications.

WPF AI Chat

• AI Agent Integration
  • The DevExpress WPF AI Chat Control ships with a new IChatResponseProvider abstraction layer. This layer decouples the UI from AI services and allows you to bind the AI Chat Control to different AI backends.
• Agent API Demos
  • The Demo Center includes new examples that demonstrate real-world AI agent usage scenarios and integration patterns with the DevExpress WPF AI Chat Control.
• Chat Fluent UI
  • The updated Chat UI aligns with modern Fluent design standards.
• Customize Chat Input Placeholder
  • Use the AIChatControl.InputBoxNullText property to specify placeholder text in the input box.
• API Enhancements
  • DevExpress have updated message processing APIs and refined naming for consistency.

AI-powered Extensions

• Prompt to Expression - WPF Filter Editor and Expression Editor
  • Added AI-powered expression generation to help users create filter and column expressions for DevExpress data-aware WPF controls using natural language. Users describe the desired logic in plain text. The system sends the prompt to the configured AI service and returns a valid expression. The DevExpress WPF Expression Editor and/or Filter Editor display and validate results immediately.

Accessibility Enhancements

• Pivot Grid - Filter Panel Keyboard Navigation
  • The WPF Pivot Grid includes full keyboard access to the Filter Panel.
• Spreadsheet Control - Screen Reader Support
  • Spreadsheet documents are now accessible to screen readers (Narrator, NVDA). You can navigate through document sheets, rows, columns, and cells. Readers can pronounce all worksheet headings, cell text, comments, text boxes, and alt text for images, charts, and other drawing objects.
• PDF/UA-2 Format Support
  • The PDF export engine now supports the PDF/UA-2 format (for enhanced accessibility compliance). You can specify PDF/UA-2 conformance for exported documents to meet the latest accessibility standards.

WPF Data Grid

• Expression Editor for Custom Format Conditions
  • The Expression Editor (for both the TableView and TreeListView) now supports custom conditional formatting rules. Users can define formatting rules with complex logical expressions beyond predefined rule types.
• Advanced Column and Band Drag-and-Drop
  • A new ColumnDragOver event allows you to control column and band drag & drop behavior. Handle this event to validate or modify drop operations.
• Search Panel Customization
  • Extended Search Panel customization with the following options: Minimum/maximum width and Display custom content.
• Group Panel Customization
  • Group Panel customization capabilities include: Display custom content, Align Group Panel text and Customize background color.
• Column Header Customization
  • New customization options include: Display custom sort icons, Adjust icon size, Display, hide, or reposition filter icons and Apply custom templates.
• Row Indicator Customization
  • Row Indicator Panel customization options include: Specify foreground and background colors, Display custom UI elements and icons.
• Expand Button Customization
  • New options allow you to display custom glyphs/icons within expand/collapse buttons in TreeList layouts, group and master-detail rows.
• Filter Panel Customization
  • New appearance settings allow you to customize Filter Panel UI elements.
• Foreground and background colors for fields, values, and operators.
  • A color mode that switches between standard appearance and a plain style with transparent backgrounds and inherited text colors.

WPF TreeViewControl

• API Enhancements
  • Expanded TreeViewControl API to simplify customization and reduce reliance on implicit styles.

WPF Spreadsheet Control

• New Excel Functions - The DevExpress Spreadsheet Control v26.1 supports 6 new dynamic array-based Excel functions:
  • XLOOKUP.
  • XMATCH.
  • SORT.
  • SORTBY.
  • FILTER.
  • UNIQUE.

Template Kit

• Visual Basic Support
  • The DevExpress Template Kit now supports Visual Basic. You can create DevExpress-powered WPF applications in VB.NET alongside C# templates.

DateOnly & TimeOnly Support

• WPF Charts
  • The DevExpress WPF Chart Control supports .NET DateOnly and TimeOnly data types.
• WPF Pivot Grid
  • The DevExpress WPF Pivot Grid now supports DateOnly and TimeOnly data types for filtering, grouping, and summary operations in .NET applications.

MVVM Enhancements

• Simplified Dependency Injection (DI)
  • The DevExpress MVVM framework v26.1 includes built-in support for Dependency Injection (DI) directly in XAML.

Prism 9 Support

• Added Prism 9 support to the DevExpress adapters.

Monaco-Based Code Editor (Demo)

• DevExpress created an example that wraps the open source Monaco Editor (v0.55.1). The editor is hosted inside Microsoft WebView2 and exposed through a custom, reusable CodeEditor WPF control.

All WPF products

• Calculated Field - Edit Expression option is not available for DateTime, Time, and TimeSpan field types.
• End-User Report Designer - Opened tabs miss the asterisk (*) that indicates pending changes.
• MongoDBDataSource - Decimal128 isn't recognized as a simple primitive type.
• Visual Studio Report Designer - JsonDataSource connection string misses defined header/query/path parameters.
• XtraReport.SaveLayout - Disabling scripts causes CodeDOM serialization to lose script handler assignments.
• XtraReports - Duplicate XRControlStyle entries with identical names are added to StyleSheet when 'StyleSheet.LoadFromXml' is called multiple times.

DXBars for WPF

• The BarPopupBase.OnClosed method implementation can lead to potential NullReferenceExceptions.

DXDiagram for WPF

• Diagram Control throws ArgumentException when its ribbon is merged with another one and a shape's color settings are changed.

DXDocking for WPF

• Active tab caption foreground makes it difficult to read in the VS2019BlueNavy lightweight theme.
• Document Selector window causes an exception if it's opened a second time.
• DocumentPreviewControl in DockLayoutManager causes an ArgumentOutOfRangeException upon initial RDP connection.

DXEditors for WPF

• A checked read-only CheckEdit doesn't have a distinct appearance in Win11 themes.
• DateTimePicker incorrectly updates hour when 12-hour format is used and HourStep is defined.

DXGrid and DXTreeList for WPF

• CellDisplayTemplate doesn't work correctly with the Edit Entire Row functionality.
• Controls in the RowControl tooltip do not inherit parent DataContext in TreeViewControl.
• DocumentPreviewControl in DockLayoutManager causes an ArgumentOutOfRangeException upon initial RDP connection.
• GridControl in non-optimized mode hides cell tooltips when underlying data items are updated.
• GridControl/TreeListControl search functionality doesn't scroll the view port to the selected item.
• TableView does not update its HasErrors property when the last row that contains errors is deleted.

DXLayoutControl for WPF

• TouchOverlap scrollbars do not appear in FlowLayoutControl when ItemsSource is changed at runtime.

DXRibbon for WPF

• BarStaticItems in RibbonControl take more vertical space when Win11 themes are used and lightweight templates are enabled.

DXRichEdit for WPF

• ArgumentOutOfRangeException is thrown on inputting IME on a selection.
• Rich Edit Control — "System.Net.WebException: 'The UNC path should be of the form \\server\share.'" exception occurs when certain fonts are added to DXFontRepository.
• Table cell's text is cut off when a decimal tab is set to a specific value.
• RichEditControl does not cache images in headers and footers.
• RichEditControl has incorrect caret color in lighweight dark themes.
• RichEditControl throws ArgumentException on an attempt to link a page footer to the previous page in specific documents.
• Word Processing Document API - Background thread exception is thrown when SubDocument.Delete method is called.

DXScheduler for WPF

• Appointment subject with accents is not displayed at 150% scaling.

DXSpreadsheet for WPF

• SpreadsheetControl.Dispose method throws a NullReferenceException.

MVVM Framework

• DocumentPreviewControl in DockLayoutManager causes an ArgumentOutOfRangeException upon initial RDP connection.

Themes and Theme Designer

• Button content alignment is changed in an application with an implicit style for the Button type if LightweightThemes are switched at runtime.
• Win11SystemColors lightweight theme does not respond to the system app mode or accent color changes when SplashScreenManager is used.

All WPF products

• XtraReport - ScriptReferences are no longer used for compilation.

DXCharts for WPF

• NullReferenceException is thrown when WaterfallSeries2D is removed while different series types are present.

DXEditors for WPF

• DateNavigator navigation does not work when explicitly used within a DateEdit PopupContentTemplate.

DXGrid and DXTreeList for WPF

• GridControl automation values differ from previous versions even if LegacyAutomationNamesRowsCells is enabled.
• Sorted TreeListView loses selection made with Shift+Arrow keys when the underlying data source is updated.

DXPivotGrid for WPF

• PivotGrid for WPF - "Cannot find source for binding with reference" binding errors occur when the field is dragged from the Field List.

DXScheduler for WPF

• FixedTimeScales always show 15-minute intervals regardless of Scale in Legacy mode when TimeScalesSource is used.

DXSpreadsheet for WPF

• Chart moved to a new sheet crashes the application with NullReferenceException after a click on it.

Navigation Controls for WPF

• AccordionControl sets incorrect accessible names for AccordionItems on using ItemsSource.
• TreeViewControl's horizontal scroll bar is rendered incorrectly when ScrollBarMode is set to TouchOverlap.

All WPF products

• DocumentPreviewControl throws NullReferenceException after TAB is pressed on the last editable field and clicking on the preview.
• NonTrustedTypeDeserializationException is thrown even when RegisterTrustedAssembly is used.
• ReportGenerationExtensions helper class produces an incorrect filter string when converting a WPF grid control to a report.
• Reporting controls lose/misalign borders when exporting to a DOCX file using the Frame-based layout.
• XRRichText - Formulas / Equations are exported incorrectly in DOCX format.

DXCharts for WPF

• Chart Designer loses series properties when series views are changed.

DXDocking for WPF

• DevExpress.Xpf.Docking.LayoutItemsHelper.IsDockItem may throw NullReferenceException in certain cases.

DXGrid and DXTreeList for WPF

• Selector Column causes visual issues on first load when CheckBoxSelectorColumnPosition is FixedRight and grouping is enabled.

DXRibbon for WPF

• BackstageTabItem from a child RibbonControl does not showdisplay its KeyTip after the Merge operation.
• Captions in ribbon gallery drop-down are rendered incorrectly in certain cases.
• RibbonControl embedded in the ThemedWindow does not adjust its layout when its FontSize is changed at runtime.
• StackOverflowException is thrown when a merged BackstageView with an item containing focusable content is opened via keyboard.

DXRichEdit for WPF

• Word Processing Document API - Tables are not clipped beyond page column bounds.
• DXRichEdit for WPF - Application crashes if a new table row/column adjacent to a cell with a nested table is inserted.
• Formatted text copied from PowerPoint cannot be pasted in RichEdit.
• RichEditControl - Dots are displayed when the list level number style is set to None.
• RichEditControl - Paragraph that fits into the page width is wrapped.
• Text with Justify alignment in lists is shifted when text below the list is modified.
• WPF Rich Edit Control - "Link to Previous" Ribbon command is activated when a document contains a single section.

DXScheduler for WPF

• Open Recurring Item dialog doesn't react to the first several touches on a machine with the TabletInputService enabled.

DXSpreadsheet for WPF

• SpreadsheetControl throws ArgumentOutOfRangeException on an attempt to apply conditional formatting rules.

PDF Viewer for WPF

• System.IO.IOException is thrown when opening a file attachment.
• Application hangs when printing a specific PDF file.
• The resulting PDF/A-3b accessible document is displayed incorrectly.
• Specific PDF documents are displayed with incorrect page orientation.

ProjectConverter

• Error occurs after converting a project to v25.2 (The operation has timed out).
• TypeInitializationException (The type initializer for 'Microsoft.Build.Shared.XMakeElements' threw an exception) after converting a VB.NET project.

Themes and Theme Designer

• It's not possible to override the selected panel's foreground color for TabbedGroups at the palette level.

Windows and Utility Controls for WPF

• RibbonControl embedded in the ThemedWindow does not adjust its layout when its FontSize is changed at runtime.

All WPF products

• Query Parameters Dialog - Preview can't be displayed after changing the value to Expression without reopening the dialog.
• Visual Studio Report Designer - Expression Editor throws InvalidCastException if an expression that has a calculated field is hovered over.
• Visual Studio Report Designer - The Toolbox panel is empty (the Solution Folders issue).
• Visual Studio Report Designer - UI background does not reflect new VS 2026 themes.
• XRShape - LineWidth is changed to 0 when opened in the End-User Report Designer.

DXBars for WPF

• The inner GetPopupRoot method can lead to unexpected side effects.

DXCharts for WPF

• ChartControl does not show any series points when its diagram is rotated and the Y axis contains scale breaks.

DXDocking for WPF

• Document Selector window doesn't work if it is shown before the switch user action.
• The OnSystemEventsDisplaySettingsChanged method uses a synchronous call when the Dispatcher object is busy.

DXGrid and DXTreeList for WPF

• Cell tooltip does not appear when InplaceBaseEdit is used as CellTemplate.
• GridControl cannot show and edit data from custom ObservableCollection or BindingList collections that implement the 'this[Range]' indexer.
• MRU filter popup closes unexpectedly during BeginDataUpdate/EndDataUpdate.
• TableView raises CellValueChanged for the first entered symbol in New Item Row on machines with non-standard DPI settings.
• TreeViewControl does not show tooltips defined in NodeStyle.
• TreeViewControl doesn't update node expand states when BindingList sends reset notifications.

DXRibbon for WPF

• BarItemSeparator is invisible in RibbonStatusBarControl in the Win11Light theme.

DXRichEdit for WPF

• Images cannot be pasted to RichEditControl in .NET 10.
• RichEditControl - Chinese, Japanese, and Korean (CJK) text is wrapped differently compared to Microsoft Word when the "Justify" formatting is applied.
• RichEditControl - The "All Caps" formatting is not applied to a numbering list's format string.
• RichEditControl - The tab separator is missing in a numbering list.
• RichEditControl throws ArgumentNullException when an automation tool is used if Visibility is set to Collapsed.

DXSpreadsheet for WPF

• Images cannot be pasted in .NET 10 applications.

Data Access Library

• .NET 10 Runtime throws a fatal error when multiple JSON data sources are created.

Navigation Controls for WPF

• TreeViewControl does not show tooltips defined in NodeStyle.
• TreeViewControl doesn't update node expand states when BindingList sends reset notifications.

PDF Viewer for WPF

• "System.InvalidOperationException: 'Sequence contains no elements'" exception occurs when a specific document is loaded.

Windows and Utility Controls for WPF

• A dependency for System.Interactive.Async in v25.2.3 leads to compilation errors.
• BreadcrumbControl - Memory leak occurs when a collection of child items is reset at the ViewModel level.

All WPF products

• DocumentPreviewControl - An exception is thrown when you press the Page Setup button.
• Report Designer - Text localization doesn't apply to some items.
• WPF Viewer - Report generation works incorrectly when CachedReportSource is used.
• XRRichText - Formulas / Equations are exported incorrectly in RTF format.

DXBars for WPF

• BarButtonItem is rendered too wide in certain cases when DataContext is set in code.

DXCharts for WPF

• Chart3DControl - Axis title alignment is ignored when axis is set to logarithmic scale.
• DXCharts for WPF - Point Markers are still visible when making a new Selection.
• DXCharts for WPF - Rectangle Selection throws NullReferenceException when IsDirectXSurfaceRendering is enabled.

DXGantt for WPF

• GanttControl checkboxes appear clipped when ShowCheckboxes is enabled.

DXGrid and DXTreeList for WPF

• GridControl defined in a separate UserControl does not render sort glyphs in its columns.
• GridControl does not copy display values from a column with ComboBoxEditSettings when ClipboardMode is set to Formatted.
• GridControl's row context menu is difficult to invoke on a touch device.
• Summary sort menu item shows empty field name when Show Row Count is checked in Group Summary Editor.

DXRibbon for WPF

• BackstageView does not show scroll bars when it cannot show all its items.

DXRichEdit for WPF

• Content copied from RichEditControl cannot be pasted in another control instance.
• DXRichEdit - RichEditControl disappears from a floating LayoutPanel when a parent Tab Control tab is docked into the main window.
• Pictures use incorrect text wrapping settings in Print Preview.
• RichEditControl displays empty lines where the small caps formatting is applied with incorrect heights.
• Word Processing API - Unlinking headers or footers throws a StackOverflowException if the SubDocument contains a DOCVARIABLE field.

DXSpreadsheet for WPF

• SpreadsheetControl - The NullReferenceException occurs in RangeImagePageCalculator when the clipboard data is converted to an image on pasting.

MVVM Framework

• LightweightThemeManager.WindowThemeManager can stay in memory after removing the owner control from the visual tree.

Themes and Theme Designer

• LightweightThemeManager.WindowThemeManager can stay in memory after removing the owner control from the visual tree.

Windows and Utility Controls for WPF

• SVG stroke-dasharray property does not work when values are space-delimited.
• The QualifiedImage markup extension causes an exception in .NET 10 applications.