Learn what's new across releases, with details of features, enhancements, and resolved issues.
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MindFusion.Spreadsheet for WinForms V1.8.1Nov 16, 2025
Features
Optimized Calculation Engine
Performance in large multi-sheet workbooks has been improved by introducing spatial indexing of cell data, leading to 2-3 times faster initial and incremental formula calculations.
Added New Functions
SUMIFS adds the cells in a range that meet multiple criteria.
COUNTIFS counts the number of cells specified by a given set of conditions or criteria.
CONCAT merges text from several ranges and/or individual strings.
TEXTJOIN combines text from multiple ranges or strings, inserting a specified delimiter between each text value.
MindFusion.Spreadsheet for WinForms V1.8Major versionJun 11, 2025
Features
Spilled Arrays
Formulas can now run arithmetic operations on whole ranges and return two-dimensional arrays as results. Elements from such arrays are assigned to adjacent cells to the one that calculates the formula. For example, you could show element-wise sum of ranges by setting a single formula in =A1:C3+E1:F3 format. If a cell from the spill range already contains a value, the formula returns a #SPILL error. Apart from arithmetic calculations, spilled arrays can also be returned by following new functions.
Spilled Array Functions
FILTER returns an array of filtered rows from specified source range.
SORT returns an array of sorted rows or columns from specified source range.
UNIQUE returns an array of unique values from the specified range.
XLOOKUP searches for a value in a range and returns the matching row or column from specified results range.
Set the ShowLeadingApostrophes property to stop hiding escaping leading apostrophe (used to treat remaining cell content as text).
Improved compatibility with Excel of VLOOKUP function in undefined cases (when lookup value is missing and source range is not sorted).
YEARFRAC function calculates the ratio between days in specified interval to the number of days in a year.
SUMIF/COUNTIF criteria are now case-insensitive for compatibility with Excel.
[h], [m] and [s] format specifiers allow displaying time totals with more than 24 hours or 60 minutes / seconds respectively.
Fixes
DATEDIF function fix for calculating month difference.
Formula bar preserves original text when evaluation is disabled.