Syncfusion Essential Studio Windows Forms 2026 Volume 2 (34.1.31)2026年7月14日
修复
GroupBar
Chinese characters in the collapsed text of the GroupBar are now displayed correctly when AllowCollapse is enabled.
ScheduleControl
The selection background color is now applied correctly to the immediate next month from the current month in the ScheduleControl. Additionally, unexpected navigation no longer occurs when days belonging to a disabled month are selected while the corresponding months are already visible in the view. Month navigation now behaves as expected.
Syncfusion Essential Studio Windows Forms 2026 Volume 2 (34.1.30)2026年7月9日
修复
Calculate
An issue related to parsing returning an incorrect result when the sheet name contains a hyphen in CalcEngine has been fixed.
Syncfusion Essential Studio Windows Forms 2026 Volume 2 (34.1.29)主版本2026年7月6日
功能
AI AssistView
Response toolbar - The response toolbar is now equipped with built-in actions such as copy, regenerate, like, and dislike. It is designed to streamline user interactions and is implemented for AI messages to enhance usability, interaction control, and user productivity in the AI AssistView.
Stop responding button - This feature allows users to interrupt or cancel an ongoing response-generation process in real time.
Calculation Engine
Faster COUNTIF formula calculations - Performance has been significantly improved for large workbooks with repeated COUNTIF calculations. The Calculation Engine now caches results to avoid redundant evaluations, reducing unnecessary processing and delivering up to 95% faster performance in scenarios with extensive COUNTIF formula usage.
Syncfusion Essential Studio Windows Forms 2026 Volume 1 SP1 (33.2.13)2026年6月16日
修复
Calculate
An issue related to IFS Formula being misinterpreted as IF in CalcEngine and returning incorrect results has been fixed.
EditControl
Fixed an issue in EditControl where double click followed by Shift click selection excluded the initially selected word.
Syncfusion Essential Studio Windows Forms 2026 Volume 1 SP1 (33.2.6)2026年5月12日
修复
Calculate
An issue related to recursive named range validation causing a hanging issue in CalcEngine has been fixed.
An issue related to duplicate key exception in CalcEngine when re-enabling sheet calculations after external sheet registration has been fixed.
ScheduleControl
Multi-day appointments in the WorkWeek view will now correctly display their next-day portion in ScheduleControl.
Cross-midnight appointments in the WorkWeek view are now saved correctly, and span appointments can be dragged up or down without increasing their height, maintaining their size and moving accurately based on the drag position in ScheduleControl.
SfDataGrid
Fixed an issue where the FilterElement.IsSelected property was not updated correctly when the Select All option was unchecked while search text was applied in GridFilterControl.
Syncfusion Essential Studio Windows Forms 2026 Volume 1 SP1 (33.2.5)2026年5月5日
修复
Calculate
An issue related to the greater than or equal operator returned incorrect results when comparing exponential and double values in CalcEngine has been fixed.
An issue related to incorrect formula value reuse for dynamic array and context-dependent formulas in CalcEngine has been fixed.
Improved calculation performance for duplicate cell recalculation by optimizing dependency refresh logic, resulting in ~60% faster execution and reducing calculation time from ~40–50 seconds to ~15–20 seconds.
Syncfusion Essential Studio Windows Forms 2026 Volume 1 SP1 (33.2.4)2026年4月28日
修复
ScheduleControl
System.ObjectDisposedException no longer occurs when an appointment is randomly moved and opened in the WorkWeek view.
Syncfusion Essential Studio Windows Forms 2026 Volume 1 SP1 (33.2.3)2026年4月21日
功能
Calculate
Improved calculation speed for repeated range updates. CalcEngine now processes frequently updated used ranges more efficiently, delivering 50-63% faster performance and reducing calculation time from approximately 30 seconds to 15-19 seconds.
Significantly faster recalculation of repeated formulas. Optimizations to how identical formulas are recalculated across cells result in up to 94% faster performance, reducing calculation time from around 9 minutes to approximately 30 seconds.
修复
PivotGrid
The PivotGridControl now updates its GridVisualStyles correctly without overriding the styles of the parent form's GridControl or GridGroupingControl when the ShowPivotTableFieldList property is enabled.
SfForm
SfForm now renders consistent borders in both active and inactive states with IsMdiContainer enabled, preventing child controls from being clipped.
Syncfusion Essential Studio Windows Forms 2026 Volume 1 (33.1.49)2026年4月14日
修复
Calculate
An issue related to the TEXT formula returns incorrect result when using time values with custom format in CalcEngine has been fixed.
An issue related to the IF formula returning incorrect results when using arithmetic operator across multiple IF formulas in CalcEngine has been fixed.
Syncfusion Essential Studio Windows Forms 2026 Volume 1 (33.1.47)2026年4月7日
修复
Calculate
An issue related to the INDIRECT and SUMIFS formulas which returned #NAME? error string when used as interior formulas in CalcEngine has been fixed.
PivotGrid
Now, a StackOverflowException will no longer be thrown when filtering columns in PivotGridControl that is bound to a DataTable with EnableUpdating set to true.
Now , the first row and first column are now displayed correctly in the Print Preview when the PrintColumnToFitPage property is enabled in PivotGridControl.
Syncfusion Essential Studio Windows Forms 2026 Volume 1 (33.1.46)2026年3月31日
修复
TreeViewAdv
Now the DragNodeCue image is correctly drawn for all dragged nodes beside the cursor, instead of showing only the last selected node when dragging multiple nodes with ShowDragNodeCue enabled in TreeViewAdv.
Syncfusion Essential Studio Windows Forms 2026 Volume 1 (33.1.44)主版本2026年3月16日
功能
AI AssistView
The WinForms AI AssistView control now provides an interface for integrating conversational AI services into Windows Forms applications. Key features include:
Suggestions.
Typing indicator.
Banner customization.
Theme support.
Calculation Engine
Optimized formula engine for faster calculations - The core processes have been refined to significantly accelerate formula evaluation across large worksheets.
Faster SUMPRODUCT calculations - The performance of worksheets using the SUMPRODUCT formula has been significantly improved, especially when working with multiple ranges and large datasets containing over 50,000 dependent cells. The Calculation Engine now reuses previously computed values instead of recalculating them, resulting in noticeably faster processing and delivering an overall performance improvement of about 37.5%.
Faster IF formula processing - Performance has been significantly improved for worksheets that rely heavily on IF formulas, especially in large spreadsheets containing thousands of rows and columns. The Calculation Engine now handles logic more efficiently, reducing unnecessary processing and delivering up to 75% faster performance in scenarios with extensive IF formula usage.
Diagram
Force-directed tree layout - You can now utilize a physics-based algorithm to dynamically arrange nodes for improved visualization. It attracts and repulses connected nodes to reduce overlaps and edge crossings. The result is a clean, intuitive layout that clarifies complex relationships in network analysis.
Syncfusion Essential Studio Windows Forms 2025 Volume 4 SP1 (32.2.9)2026年3月10日
修复
Calculate
An issue related to the addition operation between two formula cells in CalcEngine has been fixed.
Syncfusion Essential Studio Windows Forms 2025 Volume 4 SP1 (32.2.8)2026年3月3日
修复
Calculate
An issue related to the Equal operator returning incorrect result when comparing equivalent values in string and numeric formats in CalcEngine has been fixed.
An issue related to the INDIRECT formula returning a #VALUE! error when an inner formula produced an invalid result in CalcEngine has been fixed.
An issue related to nested IFERROR formulas incorrectly producing a #NAME? error in CalcEngine has been fixed.
An issue related to the IFERROR formula returning incorrect result when a named range contained a space in CalcEngine has been fixed.
Syncfusion Essential Studio Windows Forms 2025 Volume 4 SP1 (32.2.7)2026年2月24日
修复
Calculate
An issue related to the SUM formula returning an incorrect result when the argument contained an invalid range in CalcEngine has been fixed.
PivotGrid
The PivotGridControl now updates its GridVisualStyles correctly without overriding the styles of the parent form's GridControl or GridGroupingControl when the ShowPivotTableFieldList property is enabled.
Syncfusion Essential Studio Windows Forms 2025 Volume 4 SP1 (32.2.3)2026年2月5日
修复
GridGroupingControl
After inserting rows into the GridGroupingControl DataSource at runtime, the last row’s data will no longer change when it is selected.
RibbonControlAdv
RibbonForm can now be resized correctly from the left and right edges.
NullReferenceException will no longer occur when adding a ToolStripEx through CustomizeRibbon and accessing its Items property.
SfDateTimeEdit
Reduced extra spacing between datetime fields in SfDateTimeEdit when the editing mode is set to Mask.
Syncfusion Essential Studio Windows Forms 2025 Volume 4 (32.1.25)2026年1月27日
修复
Calculate
An issue related to IF formula returning an incorrect result when using German culture in the Blazor application has been fixed.
Syncfusion Essential Studio Windows Forms 2025 Volume 4 (32.1.23)2026年1月13日
修复
EditControl
The application now loads the EditControl correctly within a child form inside the DockingManager and other Syncfusion controls without hanging, even when multiple forms are present.
Syncfusion Essential Studio Windows Forms 2025 Volume 4 (32.1.22)2026年1月6日
修复
Calculate
An issue related to SUBSTITUTE formula returning an incorrect value for the decimal separator in CalcEngine has been fixed.
SfComboBox
The selection range now updates correctly when editing text in SfComboBox with SuggestAppend enabled.