Class ExcelFunction

Base class for Excel function implementations.

Inheritance

System.Object

ExcelFunction

DatabaseFunction

Dcount

Days

ConvertFunction

Erf

Erfc

ErrorHandlingFunction

HiddenValuesHandlingFunction

IfsWithMultipleMatchesBase

MultipleRangeCriteriasFunction

Text

Inherited Members

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.ToString()

Namespace: OfficeOpenXml.FormulaParsing.Excel.Functions

Assembly: EPPlus.dll

Syntax

public abstract class ExcelFunction

Constructors

ExcelFunction()

Declaration

public ExcelFunction()

ExcelFunction(ArgumentCollectionUtil, ArgumentParsers, CompileResultValidators)

Declaration

public ExcelFunction(ArgumentCollectionUtil argumentCollectionUtil, ArgumentParsers argumentParsers, CompileResultValidators compileResultValidators)

Parameters

Type	Name	Description
ArgumentCollectionUtil	argumentCollectionUtil
ArgumentParsers	argumentParsers
CompileResultValidators	compileResultValidators

Fields

NumberOfSignificantFigures

Declaration

protected readonly int NumberOfSignificantFigures

Field Value

Type	Description
System.Int32

Properties

IsErrorHandlingFunction

Declaration

public virtual bool IsErrorHandlingFunction { get; }

Property Value

Type	Description
System.Boolean

IsLookupFuction

Declaration

public virtual bool IsLookupFuction { get; }

Property Value

Type	Description
System.Boolean

Methods

AreEqual(Double, Double)

Helper method for comparison of two doubles.

Declaration

protected bool AreEqual(double d1, double d2)

Parameters

Type	Name	Description
System.Double	d1
System.Double	d2

Returns

Type	Description
System.Boolean

ArgsToDoubleEnumerable(Boolean, Boolean, IEnumerable<FunctionArgument>, ParsingContext)

Will return the arguments as an enumerable of doubles.

Declaration

protected virtual IEnumerable<ExcelDoubleCellValue> ArgsToDoubleEnumerable(bool ignoreHiddenCells, bool ignoreErrors, IEnumerable<FunctionArgument> arguments, ParsingContext context)

Parameters

Type	Name	Description
System.Boolean	ignoreHiddenCells	If a cell is hidden and this value is true the value of that cell will be ignored
System.Boolean	ignoreErrors	If a cell contains an error, that error will be ignored if this method is set to true
System.Collections.Generic.IEnumerable<FunctionArgument>	arguments
ParsingContext	context

Returns

Type	Description
System.Collections.Generic.IEnumerable<ExcelDoubleCellValue>

ArgsToDoubleEnumerable(Boolean, IEnumerable<FunctionArgument>, ParsingContext)

Will return the arguments as an enumerable of doubles.

Declaration

protected virtual IEnumerable<ExcelDoubleCellValue> ArgsToDoubleEnumerable(bool ignoreHiddenCells, IEnumerable<FunctionArgument> arguments, ParsingContext context)

Parameters

Type	Name	Description
System.Boolean	ignoreHiddenCells	If a cell is hidden and this value is true the value of that cell will be ignored
System.Collections.Generic.IEnumerable<FunctionArgument>	arguments
ParsingContext	context

Returns

Type	Description
System.Collections.Generic.IEnumerable<ExcelDoubleCellValue>

ArgsToDoubleEnumerable(IEnumerable<FunctionArgument>, ParsingContext)

Will return the arguments as an enumerable of doubles.

Declaration

protected virtual IEnumerable<ExcelDoubleCellValue> ArgsToDoubleEnumerable(IEnumerable<FunctionArgument> arguments, ParsingContext context)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<FunctionArgument>	arguments
ParsingContext	context

Returns

Type	Description
System.Collections.Generic.IEnumerable<ExcelDoubleCellValue>

ArgsToDoubleEnumerableZeroPadded(Boolean, ExcelDataProvider.IRangeInfo, ParsingContext)

Declaration

protected virtual IEnumerable<double> ArgsToDoubleEnumerableZeroPadded(bool ignoreHiddenCells, ExcelDataProvider.IRangeInfo rangeInfo, ParsingContext context)

Parameters

Type	Name	Description
System.Boolean	ignoreHiddenCells
ExcelDataProvider.IRangeInfo	rangeInfo
ParsingContext	context

Returns

Type	Description
System.Collections.Generic.IEnumerable<System.Double>

ArgsToObjectEnumerable(Boolean, IEnumerable<FunctionArgument>, ParsingContext)

Will return the arguments as an enumerable of objects.

Declaration

protected virtual IEnumerable<object> ArgsToObjectEnumerable(bool ignoreHiddenCells, IEnumerable<FunctionArgument> arguments, ParsingContext context)

Parameters

Type	Name	Description
System.Boolean	ignoreHiddenCells	If a cell is hidden and this value is true the value of that cell will be ignored
System.Collections.Generic.IEnumerable<FunctionArgument>	arguments
ParsingContext	context

Returns

Type	Description
System.Collections.Generic.IEnumerable<System.Object>

ArgToAddress(IEnumerable<FunctionArgument>, Int32)

Declaration

protected string ArgToAddress(IEnumerable<FunctionArgument> arguments, int index)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<FunctionArgument>	arguments
System.Int32	index

Returns

Type	Description
System.String

ArgToAddress(IEnumerable<FunctionArgument>, Int32, ParsingContext)

Declaration

protected string ArgToAddress(IEnumerable<FunctionArgument> arguments, int index, ParsingContext context)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<FunctionArgument>	arguments
System.Int32	index
ParsingContext	context

Returns

Type	Description
System.String

ArgToBool(IEnumerable<FunctionArgument>, Int32)

If the argument is a boolean value its value will be returned. If the argument is an integer value, true will be returned if its value is not 0, otherwise false.

Declaration

protected bool ArgToBool(IEnumerable<FunctionArgument> arguments, int index)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<FunctionArgument>	arguments
System.Int32	index

Returns

Type	Description
System.Boolean

ArgToDecimal(IEnumerable<FunctionArgument>, Int32)

Returns the value of the argument att the position of the 0-based index as a System.Double.

Declaration

protected double ArgToDecimal(IEnumerable<FunctionArgument> arguments, int index)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<FunctionArgument>	arguments
System.Int32	index

Returns

Type	Description
System.Double	Value of the argument as an integer.

Exceptions

Type	Condition
ExcelErrorValueException

ArgToDecimal(IEnumerable<FunctionArgument>, Int32, PrecisionAndRoundingStrategy)

Returns the value of the argument att the position of the 0-based index as a System.Double.

Declaration

protected double ArgToDecimal(IEnumerable<FunctionArgument> arguments, int index, PrecisionAndRoundingStrategy precisionAndRoundingStrategy)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<FunctionArgument>	arguments
System.Int32	index
PrecisionAndRoundingStrategy	precisionAndRoundingStrategy	strategy for handling precision and rounding of double values

Returns

Type	Description
System.Double	Value of the argument as an integer.

Exceptions

Type	Condition
ExcelErrorValueException

ArgToDecimal(Object)

Returns the value of the argument att the position of the 0-based

Declaration

protected double ArgToDecimal(object obj)

Parameters

Type	Name	Description
System.Object	obj

Returns

Type	Description
System.Double	Value of the argument as a double.

Exceptions

Type	Condition
ExcelErrorValueException

ArgToDecimal(Object, PrecisionAndRoundingStrategy)

Returns the value of the argument att the position of the 0-based

Declaration

protected double ArgToDecimal(object obj, PrecisionAndRoundingStrategy precisionAndRoundingStrategy)

Parameters

Type	Name	Description
System.Object	obj
PrecisionAndRoundingStrategy	precisionAndRoundingStrategy	strategy for handling precision and rounding of double values

Returns

Type	Description
System.Double	Value of the argument as a double.

Exceptions

Type	Condition
ExcelErrorValueException

ArgToInt(IEnumerable<FunctionArgument>, Int32)

Returns the value of the argument att the position of the 0-based index as an integer.

Declaration

protected int ArgToInt(IEnumerable<FunctionArgument> arguments, int index)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<FunctionArgument>	arguments
System.Int32	index

Returns

Type	Description
System.Int32	Value of the argument as an integer.

Exceptions

Type	Condition
ExcelErrorValueException

ArgToRangeInfo(IEnumerable<FunctionArgument>, Int32)

Declaration

protected ExcelDataProvider.IRangeInfo ArgToRangeInfo(IEnumerable<FunctionArgument> arguments, int index)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<FunctionArgument>	arguments
System.Int32	index

Returns

Type	Description
ExcelDataProvider.IRangeInfo

ArgToString(IEnumerable<FunctionArgument>, Int32)

Returns the value of the argument att the position of the 0-based index as a string.

Declaration

protected string ArgToString(IEnumerable<FunctionArgument> arguments, int index)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<FunctionArgument>	arguments
System.Int32	index

Returns

Type	Description
System.String	Value of the argument as a string.

BeforeInvoke(ParsingContext)

If overridden, this method is called before Execute is called.

Declaration

public virtual void BeforeInvoke(ParsingContext context)

Parameters

Type	Name	Description
ParsingContext	context

CalculateCollection(IEnumerable<FunctionArgument>, Double, Func<FunctionArgument, Double, Double>)

Use this method to apply a function on a collection of arguments. The result should be modifyed in the supplied action and will contain the result after this operation has been performed.

Declaration

protected virtual double CalculateCollection(IEnumerable<FunctionArgument> collection, double result, Func<FunctionArgument, double, double> action)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<FunctionArgument>	collection
System.Double	result
System.Func<FunctionArgument, System.Double, System.Double>	action

Returns

Type	Description
System.Double

CheckForAndHandleExcelError(FunctionArgument)

if the supplied arg contains an Excel error an ExcelErrorValueException with that errorcode will be thrown

Declaration

protected void CheckForAndHandleExcelError(FunctionArgument arg)

Parameters

Type	Name	Description
FunctionArgument	arg

Exceptions

Type	Condition
ExcelErrorValueException

CheckForAndHandleExcelError(ExcelDataProvider.ICellInfo)

If the supplied cell contains an Excel error an ExcelErrorValueException with that errorcode will be thrown

Declaration

protected void CheckForAndHandleExcelError(ExcelDataProvider.ICellInfo cell)

Parameters

Type	Name	Description
ExcelDataProvider.ICellInfo	cell

CreateResult(eErrorType)

Declaration

protected CompileResult CreateResult(eErrorType errorType)

Parameters

Type	Name	Description
eErrorType	errorType

Returns

Type	Description
CompileResult

CreateResult(Object, DataType)

Use this method to create a result to return from Excel functions.

Declaration

protected CompileResult CreateResult(object result, DataType dataType)

Parameters

Type	Name	Description
System.Object	result
DataType	dataType

Returns

Type	Description
CompileResult

Divide(Double, Double)

Declaration

protected double Divide(double left, double right)

Parameters

Type	Name	Description
System.Double	left
System.Double	right

Returns

Type	Description
System.Double

Execute(IEnumerable<FunctionArgument>, ParsingContext)

Declaration

public abstract CompileResult Execute(IEnumerable<FunctionArgument> arguments, ParsingContext context)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<FunctionArgument>	arguments	Arguments to the function, each argument can contain primitive types, lists or ExcelDataProvider.IRangeInfo
ParsingContext	context	The ParsingContext contains various data that can be useful in functions.

Returns

Type	Description
CompileResult	A CompileResult containing the calculated value

GetFirstValue(IEnumerable<FunctionArgument>)

Used for some Lookupfunctions to indicate that function arguments should not be compiled before the function is called.

Declaration

protected object GetFirstValue(IEnumerable<FunctionArgument> val)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<FunctionArgument>	val

Returns

Type	Description
System.Object

GetResultByObject(Object)

Declaration

protected CompileResult GetResultByObject(object result)

Parameters

Type	Name	Description
System.Object	result

Returns

Type	Description
CompileResult

IsBool(Object)

Declaration

protected bool IsBool(object val)

Parameters

Type	Name	Description
System.Object	val

Returns

Type	Description
System.Boolean

IsInteger(Object)

Declaration

protected bool IsInteger(object n)

Parameters

Type	Name	Description
System.Object	n

Returns

Type	Description
System.Boolean

IsNumeric(Object)

Declaration

protected bool IsNumeric(object val)

Parameters

Type	Name	Description
System.Object	val

Returns

Type	Description
System.Boolean

IsNumericString(Object)

Declaration

protected bool IsNumericString(object value)

Parameters

Type	Name	Description
System.Object	value

Returns

Type	Description
System.Boolean

IsString(Object, Boolean)

Declaration

protected bool IsString(object val, bool allowNullOrEmpty = true)

Parameters

Type	Name	Description
System.Object	val
System.Boolean	allowNullOrEmpty

Returns

Type	Description
System.Boolean

ThrowArgumentExceptionIf(Func<Boolean>, String)

Throws an System.ArgumentException if condition evaluates to true.

Declaration

protected void ThrowArgumentExceptionIf(Func<bool> condition, string message)

Parameters

Type	Name	Description
System.Func<System.Boolean>	condition
System.String	message

Exceptions

Type	Condition
System.ArgumentException

ThrowArgumentExceptionIf(Func<Boolean>, String, Object[])

Throws an System.ArgumentException if condition evaluates to true.

Declaration

protected void ThrowArgumentExceptionIf(Func<bool> condition, string message, params object[] formats)

Parameters

Type	Name	Description
System.Func<System.Boolean>	condition
System.String	message
System.Object[]	formats	Formats to the message string.

ThrowExcelErrorValueException(eErrorType)

Throws an ExcelErrorValueException with the given errorType set.

Declaration

protected void ThrowExcelErrorValueException(eErrorType errorType)

Parameters

Type	Name	Description
eErrorType	errorType

ThrowExcelErrorValueException(ExcelErrorValue)

Throws an ExcelErrorValueException with the type of given value set.

Declaration

protected void ThrowExcelErrorValueException(ExcelErrorValue value)

Parameters

Type	Name	Description
ExcelErrorValue	value

ThrowExcelErrorValueExceptionIf(Func<Boolean>, eErrorType)

Throws an System.ArgumentException if condition evaluates to true.

Declaration

protected void ThrowExcelErrorValueExceptionIf(Func<bool> condition, eErrorType errorType)

Parameters

Type	Name	Description
System.Func<System.Boolean>	condition
eErrorType	errorType

Exceptions

Type	Condition
ExcelErrorValueException

ValidateArguments(IEnumerable<FunctionArgument>, Int32)

This functions validates that the supplied arguments contains at least (the value of) minLength elements. If one of the arguments is an ExcelDataProvider.IRangeInfo the number of cells in that range will be counted as well.

Declaration

protected void ValidateArguments(IEnumerable<FunctionArgument> arguments, int minLength)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<FunctionArgument>	arguments
System.Int32	minLength

Exceptions

Type	Condition
System.ArgumentException

ValidateArguments(IEnumerable<FunctionArgument>, Int32, eErrorType)

This functions validates that the supplied arguments contains at least (the value of) minLength elements. If one of the arguments is an ExcelDataProvider.IRangeInfo the number of cells in that range will be counted as well.

Declaration

protected void ValidateArguments(IEnumerable<FunctionArgument> arguments, int minLength, eErrorType errorTypeToThrow)

Parameters

Type	Name	Description
System.Collections.Generic.IEnumerable<FunctionArgument>	arguments
System.Int32	minLength
eErrorType	errorTypeToThrow	The eErrorType of the ExcelErrorValueException that will be thrown if minLength is not met.