Migration from 0.97 to 0.100

Strongly typed value of a cell

The key breaking change is that the IXLCell.Value is no longer untyped Object backed by a string interpreted through a XLDataType, but instead is strongly typed readonly structure XLCellValue that can represent any value of a cell. Type and value are now intrinsically linked together and it is not possible to change data type without changing value.

Cell value (through XLCellValue) can now be an XLError, either literal or as a result of formula calculation.

Strongly typed cell value

IXLCell.Value and IXLCell.CachedValue are now of type XLCellValue. All possible values of a cell (blank, logical, number, text, error) can be converted to XLCellValue through implicit casting operators.

Due to change of the Value setter, it is no longer possible use setter to

  • Set the value by the IRichText. Use IXLCell.GetRichText().CopyFrom(IRichText) instead.

  • Set the value by the DateTimeOffset. Use implicit XLCellValue cast operator from DateTimeOffset.Date instead.

  • Set the value by the Guid. Use implicit XLCellValue cast operator from Guid.ToString() instead.

  • Inserting data by setting a value of type IEnumerable. Use either IXLCell.InsertData(IEnumerable) or IXLCell.InsertData<T>(IEnumerable<T>).

  • Copy data by setting a value of type IXLRangeBase. Use IXLCell.CopyFrom(IXLRangeBase)

  • Set a value to an object of any type. It originally took an object and used its ToString() method to convert the object. Call the ToString() directly in the code before setting the value to a string.

  • It is no longer possible set a value NaN or Infinity.

SetDataType methods removed

Method SetDataType has been removed from all interfaces (IXLCell, IXLColumn, IXLColumns, IXLRange …). There is no replacement, if you need to reinterpret existing data, do it in application code and set a new value with a specific type.

Evaluate methods

Evaluation methods IXLWorkbook.Evaluate(String), XLWorkbook.EvaluateExpr(String) and IXLWorksheet.Evaluate(String, String) don’t return Object, but XLCellValue.

Bulk data insert

Previously, it was possible to insert data into a worksheet by calling a IXLCell.Value setter with a value of IEnumerable. IXLCell.Value no longer accepts object, use IXLCell.InsertData methods instead.

Bulk copy cell values

Previously, it was possible to copy data from a range of cells to cells starting at cell by calling a IXLCell.Value setter with a value of IXLRangeBase. IXLCell.Value no longer accepts IXLRangeBase, use IXLCell.CopyFrom methods instead.

Rich text connected to cell value

Previously, it was possible to set a rich text to a cell by calling a IXLCell.Value setter with a value of IXLRichText. IXLRichText is now connected to the cell, changing a value of the rich text also changes value of the cell the rich text belongs to.

As a conseqence, rich text can longer be copied around from one cell to another. If you need to copy a rich text from one cell to another, use IXLRichText.CopyFrom method.

var cell = ws.Cell(1,1);
var richText = cell.GetRichText();

Assert.AreEqual("Hello", cell.Value);

Assert.AreEqual("HelloWorld", cell.Value);

Copy cell value

Previously, it was possible to use IXLCell.Value setter to copy a different cell to a cell. The main benefit in comparison of just copying the value was copying of conditional formatting of original cell. Conditional formatting is still copied for IXLCell.CopyFrom, so use IXLCell.AsRange() method as an intermediate step during replacement.

var sourceCell = ws.Cell(1, 1);
var targetCell = ws.Cell(2, 1);

Data type detected removed

Edge double values like Double.NaN, Double.PositiveInfinity, Double.NegativeInfinity can’t be excel cell value. Previously, such values were converted to string, leading to “saving number, getting text” situations. XLCellValue now throws an ArgumentException on initialization from such values.

ClosedXML also previously sometimes incorrectly detected string as a date time (e.g. for “Z12.31” interpreted as 2022-12-31). Whole detection has been removed, developer is now in control of the type in a cell through XLCellValue.

TryGetValue changes

Previously, it was possible to retrive a IXLRichText or XLHyperlink component of a cell through IXLCell.TryGetValue. That is no longer possible, use IXLCell.GetRichText() or IXLCell.GetHyperlink().

DateTime pre-1900

Previously, dates before 1900-01-01 were converted to text. That no longer happens, it is possible to set value to any DateTime value. The cell type XLDataType.DateTime is mostly masquarade above serial date time, values before 1900 are displayed as ######, but are still a serial date time values.

XLClearOptions.DataType removed

The enum member XLClearOptions.DataType has been removed. It makes no semantic sense, if you need to clear data type, you must set a new value. Use IXLRangeBase.SetValue or IXLCell.SetValue instead.

Cast errors throw InvalidCastException

Previously, methods to get a value of a cell used to the throw FormatException, instead they now throw InvalidCastException (+ they are now mostly shortcut to XLCellValue methods).

  • IXLCell.GetBoolean()

  • IXLCell.GetDouble()

  • IXLCell.GetDateTime()

  • IXLCell.GetTimeSpan()

Method IXLCell.GetValue<T>() now also throws InvalidCastException instead of FormatException.

Pivot table values use XLCellValue

Previously, the predicate of IXLPivotValueStyleFormat.AndWith (used to specify which values to apply style to) has an Object as a parameter of a predicate. It now has parameter of type XLCellValue.

It also applies to several other API:

  • IXLPivotField.SelectedValues

  • IXLPivotField.AddSelectedValue

  • IXLPivotField.AddSelectedValues

CalcEngine errors

Previously, if an error happened during formula evaluation (e.g. division by =1/0 #DIV/0!) have thrown an exception for the error derived from CalcEngineException. Errors have been incorporated to CalcEngine and are now a valid value that can be stored in a cell or it can be a result of formula evaluation.

Errors are represented by an XLError enum. CalcEngineException and derived exception have been removed.

// Errors are now valid return value. CalcEngine no longer throws exceptions
Assert.AreEqual(XLError.DivisionByZero, XLWorkbook.EvaluateExpr("1/0"));

Previously, if formula contained a standard unimplemented function, NameNotRecognizedException was thrown during parsing. Instead CalcEngine will now return XLError.NameNotRecognized error.

var wb = new XLWorkbook();
var ws = wb.AddWorksheet();
var cell = ws.Cell(1,1);
cell.FormulaA1 = "RTD(\"stockprice.rtd\", \"NASD\", \"MSFT\")";
var value = cell.Value; // Used to throw NameNotRecognizedException
Assert.AreEqual(XLError.NameNotRecognized, value.GetError());

This causes a differences, if ClosedXML saves formula values (by default it doesn’t, but can be enabled by SaveOptions.EvaluateFormulasBeforeSaving). The original behavior kept the values blank for cells with formulas containing unimplemented functions, new behavior will set values of cells to #NAME? User won’t see a difference, because Excel recalculates values on load (this is the default calculate mode for workbooks). If the workbook has a different mode (e.g. XLWorkbook.CalculateMode = XLCalculateMode.Manual), user might see the #NAME? values instead of blanks in some formulas.

XLError enum moved and order changed

Enum XLError has been moved from ClosedXML.Excel.CalcEngine namespace to ClosedXML.Excel namespace. XLError’s members have been reordered, so the order is same as values returned by ERROR.TYPE function (the values are actually used sometimes during sorting).

Value formatting

Previously, IXLCell.GetFormattedString() formatted logical values true/false to a string True/False. It now formats them to Excel compliant TRUE/FALSE.

Pivot table value field

Methods for manipulating the IXLPivotValues now use the custom name of a pivot value fields, not source names. Source name is roughly name of a column in the source table while custom name is a name of a field in the pivot table. There can be multiple values for a single source column (e.g. average value and minimal value).

Methods for manipulating the IXLPivotFields still use source names.

XLEventTracking removed

ClosedXML used to track various events and call registered event handlers. That functionality was removed long ago and now even enum XLEventTracking, LoadOptions.EventTracking property and XLWorkbook constructors that accepted the enum were removed.

To migrate the code, just remove the XLEventTracking argument from the constructor and remove setters of LoadOptions.EventTracking.