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    FilterControlOperationVisibilityEventArgs.FunctionType Property

    Gets a function-based comparison operator type.

    Namespace: DevExpress.Web

    Assembly: DevExpress.Web.v25.1.dll

    NuGet Package: DevExpress.Web

    Declaration

    public FunctionOperatorType FunctionType { get; }

    Property Value

    Type Description
    FunctionOperatorType

    An enumeration value.

    Available values:

    Show 160 items
    Name Description
    None

    The function type is not specified.

    Custom

    Identifies a custom operation. This operation is executed on the client side if its operands are constants. A custom operation is executed on the server side only if its operands cannot be evaluated locally. For more information on how to implement custom operators, review the following help topic: How to: Implement a Custom Criteria Language Function Operator.

    The eXpress Persistent Objects framework provides two custom function operators - IsExactTypeFunction and IsInstanceOfTypeFunction.

    CustomNonDeterministic

    Identifies a custom nondeterministic operation.

    Unlike a standard custom operation, a custom nondeterministic operation is always executed on the server side, regardless of whether its operands are constants.

    For more information on how to implement custom operators, review the following help topic: How to: Implement a Custom Criteria Language Function Operator.

    Iif

    Returns one of the specified values depending upon the values of logical expressions. The function can take 2N+1 arguments (where N is the number of specified logical expressions):

    • Each odd argument specifies a logical expression.
    • Each even argument specifies the value that is returned if the previous expression evaluates to True.
    • The last argument specifies the value that is returned if the previously evaluated logical expressions yield False.
    • If you pass only one argument, the passed argument is returned.
    • If you compare a 0 (zero) with a Null value, the expression evaluates to True.

    Examples: Iif(Name = 'Bob', 1, 0)
    Iif(Name = 'Bob', 1, Name = 'Dan', 2, Name = 'Sam', 3, 0)

    IsNull

    Compares the first operand with the NULL value. This function requires one or two operands of the CriteriaOperator class. The returned value depends on the number of arguments (one or two arguments).

    • True/False: If a single operand is passed, the function returns True if the operand is null; otherwise, False.
    • Value1/Value2: If two operands are passed, the function returns the first operand if it is not set to NULL; otherwise, the second operand is returned.
    IsNullOrEmpty

    Returns True if the specified value is null or an empty string. Otherwise, returns False.

    Trim

    Returns a string that is a copy of the specified string with all white-space characters removed from the start and end of the specified string.

    Len

    Returns the length of the string specified by an operand.

    To create the Len operator using the CriteriaOperator.Parse method, use the following syntax: CriteriaOperator.Parse("Len(Field1)").

    Substring

    Returns a substring from the specified string. This function requires two or three operands.

    If two operands are passed, the substring starts from the beginning of the specified string. The operands are:

    1 - the source string.

    2 - an integer that specifies the zero-based position at which the substring starts.

    If three operands are passed, a substring starts from the specified position in the source string. The operands are:

    1 - the source string.

    2 - an integer that specifies the zero-based position at which the substring starts.

    3 - an integer that specifies the length of the substring.

    Upper

    Converts all characters in a string operand to uppercase in an invariant culture.

    Lower

    Converts all characters in a string operand to lowercase in an invariant culture.

    Concat

    Concatenates the specified strings.

    Ascii

    Returns the ASCII code of the first character in a string operand.

    If the argument is an empty string, the null value is returned.

    Char

    Converts a numeric operand to a Unicode character.

    If the specified operand is not numeric, the NotSupportedException is thrown.

    ToStr

    Returns a string representation of the specified value or property.

    If the operand cannot be converted to a string, the NotSupportedException is thrown.

    Replace

    Returns a new string in which all occurrences of one specified string (string1) in another string (string2) are replaced with the specified string (string3).

    The operands are:

    1 - the string in which replacements are made.

    2 - the string to be replaced.

    3 - the string to replace all occurrences of the specified string.

    Reverse

    Returns a string in which the character order of a specified string is reversed.

    Insert

    Returns a new string in which a specified string is inserted at a specified index position into another specified string.

    The operands are:

    1 - the string into which another string should be inserted.

    2 - the zero-based index position of the insertion.

    3 - the string to insert.

    CharIndex

    Returns the index of the first occurrence of a specified string within another string.

    The operands are:

    1 - a string that you want to find in another string.

    2 - a string that contains the string you are searching for.

    3 - (optional) an integer that specifies the zero-based index at which the search starts. If this operand is not specified, the search begins from the start of the string.

    4 - (optional) an integer that specifies the number of characters to examine, starting from the specified position. If this operand is not specified, the search continues until the end of the string.

    This function performs a word search using the current culture. If a specified substring is found, the function returns its index. Otherwise, -1 is returned.

    Remove

    Returns a new string with the specified number of characters in the specified string removed, starting at the specified position.

    The operands are:

    1 - the string that needs to be shortened.

    2 - the zero-based index at which character removal starts.

    3 - (optional) an integer that specifies the number of characters to remove, starting at the specified position. If this operand is not specified, all characters between the starting position and the end of the string are removed.

    Abs

    Returns the absolute value of a numeric operand.

    If the operand is not numeric, the NotSupportedException is thrown.

    Sqr

    Returns the square root of a specified numeric operand.

    If the operand cannot be converted to Double, the NotSupportedException is thrown.

    Cos

    Returns the cosine of the numeric operand, in radians.

    If the operand cannot be converted to Double, the NotSupportedException is thrown.

    Sin

    Returns the sine of the numeric operand, in radians.

    If the operand cannot be converted to Double, the NotSupportedException is thrown.

    Atn

    Returns the arctangent (the inverse tangent function) of the numeric operand. The arctangent is the angle in the range -π/2 to π/2 radians, whose tangent is the numeric operand.

    If the operand cannot be converted to Double, the NotSupportedException is thrown.

    Exp

    Returns the number e raised to the power specified by a numeric operand.

    If the specified operand cannot be converted to Double, the NotSupportedException is thrown.

    The Exp function reverses the FunctionOperatorType.Log function. Use the FunctionOperatorType.Power operand to calculate powers of other bases.

    Log

    Returns the logarithm of the specified numeric operand. The return value depends upon the number of operands.

    If one operand is passed, the function returns the natural (base e) logarithm of a specified operand.

    If two operands are passed, the function returns the logarithm of the specified operand to the specified base. The operands are:

    1 - a number whose logarithm is to be calculated.

    2 - the base of the logarithm.

    If the operand cannot be converted to Double, the NotSupportedException is thrown.

    The Log function reverses the FunctionOperatorType.Exp function. To calculate the base-10 logarithm, use the FunctionOperatorType.Log10 function.

    Rnd

    Returns a random number greater than or equal to 0.0, and less than 1.0.

    Tan

    Returns the tangent of the specified numeric operand that is an angle in radians.

    If the operand cannot be converted to Double, the NotSupportedException is thrown.

    Power

    Returns a specified numeric operand raised to a specified power.

    The operands are:

    1 - the base number.

    2 - the exponent to which the base number is raised.

    If the operand cannot be converted to Double, the NotSupportedException is thrown.

    The Power function reverses the FunctionOperatorType.Log or FunctionOperatorType.Log10 function. Use the FunctionOperatorType.Exp operand to calculate powers of the number e.

    Sign

    Returns an integer that indicates the sign of a number. The function returns 1 for positive numbers, -1 for negative numbers, and 0 (zero) if a number is equal to zero.

    If a specified operand is not numeric, the NotSupportedException is thrown.

    Round

    Rounds a specified numeric operand to the nearest integer or to a specified number of fractional digits.

    The operands are:

    1 - a value to round.

    2 - (optional) the number of decimal places to which to round. 0 indicates that the first operand is rounded to the nearest integer.

    Ceiling

    Returns the smallest integral value greater than or equal to the specified numeric operand.

    If the specified operand is not numeric, the NotSupportedException is thrown.

    Floor

    Returns the largest integral value less than or equal to the specified numeric operand.

    If the specified operand is not numeric, the NotSupportedException is thrown.

    Max

    Returns the larger of two numeric values.

    Min

    Returns the smaller of two numeric values.

    Acos

    Returns the arccosine of the numeric operand. The arccosine is the angle in the range 0 (zero) to π radians, whose cosine is the numeric operand.

    If the operand cannot be converted to Double, the NotSupportedException is thrown.

    Asin

    Returns the arcsine of the numeric operand. The arcsine is the angle in the range -π/2 to π/2 radians, whose sine is the numeric operand.

    If the specified operand cannot be converted to Double, the NotSupportedException is thrown.

    Atn2

    Returns the arctangent (the inverse tangent function) of the quotient of the two specified numeric operands. The arctangent is the angle in the range -π/2 to π/2 radians.

    The operands are:

    1 - the y coordinate of a point in Cartesian coordinates (x, y).

    2 - the x coordinate of a point in Cartesian coordinates (x, y).

    If the specified operands cannot be converted to Double, the NotSupportedException is thrown.

    BigMul

    Calculates the full product of two integer operands.

    If the specified operands cannot be converted to Int32, the NotSupportedException is thrown.

    Cosh

    Returns the hyperbolic cosine of the numeric operand, in radians.

    If the operand cannot be converted to Double, the NotSupportedException is thrown.

    Log10

    Returns the base 10 logarithm of the specified numeric operand.

    If the operand cannot be converted to Double, the NotSupportedException is thrown.

    The Log10 function reverses the FunctionOperatorType.Power function. Use the FunctionOperatorType.Log operand to calculate the logarithm of other bases.

    Sinh

    Returns the hyperbolic sine of the numeric operand, in radians.

    If the operand cannot be converted to Double, the NotSupportedException is thrown.

    Tanh

    Returns the hyperbolic tangent of a specified numeric operand that is an angle in radians.

    If the specified operands cannot be converted to Double, the NotSupportedException is thrown.

    PadLeft

    Returns a new string that pads the character in the specified string on the left with a specified Unicode character, for a specified total length.

    The operands are:

    1 - a string to be padded.

    2 - the total number of characters in the resulting string, including padding characters.

    3 - (optional) a Unicode padding character. If not specified, the space character is used for padding. If a string is passed as this operand, its first character is used for padding.

    PadRight

    Returns a new string of a specified length in which the end of a specified string is padded with spaces or with a specified Unicode character.

    The operands are:

    1 - a string to be padded.

    2 - the total number of characters in the resulting string, including padding characters.

    3 - (optional) a Unicode padding character. If not specified, the space character is used for padding. If a string is passed as this operand, its first character is used for padding.

    StartsWith

    Returns True if the beginning of one string matches another string; otherwise, False.

    The operands are:

    1 - a string to test.

    2 - a string to match the beginning of another string.

    EndsWith

    Returns True if the end of one specified string matches another specified string; otherwise, False.

    The operands are:

    1 - a string that contains the string you are searching for.

    2 - a string to compare to the substring at the end of another string.

    To create the EndsWith operator using the CriteriaOperator.Parse method, use the following syntax: CriteriaOperator.Parse("EndsWith(String, SubString)").

    Contains

    Returns True if the specified string occurs within another specified string; otherwise, False.

    The operands are:

    1 - a string that contains the string you are searching for.

    2 - a string that you want to find in another string.

    ToInt

    Converts a numeric operand to an integer value.

    ToLong

    Converts a numeric operand to a long integer value.

    ToFloat

    Converts a numeric operand to a floating-point value.

    ToDouble

    Converts a numeric operand to a double value.

    ToDecimal

    Converts a numeric operand to a decimal value.

    LocalDateTimeThisYear

    Returns the DateTime value with the date part that is the first day of the current year, and the time part of 00:00:00.

    LocalDateTimeThisMonth

    Returns the DateTime value with the date part that is the first day of the current month, and the time part of 00:00:00.

    LocalDateTimeLastWeek

    Returns the DateTime value that has the date part that is 7 days before the start of the current week, and the time part of 00:00:00.

    LocalDateTimeThisWeek

    Returns the DateTime value with the date part that is the first day of the current week, and the time part of 00:00:00.

    LocalDateTimeYesterday

    Returns the DateTime value with the date part that is the previous day, and the time part of 00:00:00.

    LocalDateTimeToday

    Returns the DateTime value with the date part that is the start of the current day, and the time part of 00:00:00.

    LocalDateTimeNow

    Returns the DateTime value that is the current moment in time.

    LocalDateTimeTomorrow

    Returns the DateTime value with the date part that is the next day, and the time part of 00:00:00.

    LocalDateTimeDayAfterTomorrow

    Returns the DateTime value that has the date part that is two days after the current date, and the time part of 00:00:00.

    LocalDateTimeNextWeek

    Returns the DateTime value that has the date part that is 7 days after the start of the current week, and the time part of 00:00:00.

    LocalDateTimeTwoWeeksAway

    Returns the DateTime value with the date part that is the first day of the week after the next week, and the time part of 00:00:00.

    LocalDateTimeNextMonth

    Returns the DateTime value that has the date part that is the first day of the next month, and the time part of 00:00:00.

    LocalDateTimeNextYear

    Returns the DateTime value with the date part that corresponds to the first day of the next year, and the time part of 00:00:00.

    LocalDateTimeTwoMonthsAway

    Returns the DateTime value with the date part that is the first day of the month after the next month, and the time part of 00:00:00.

    LocalDateTimeTwoYearsAway

    Returns the DateTime value with the date part that is the first day of the year after the next year, and the time part of 00:00:00.

    LocalDateTimeLastMonth

    Returns the DateTime value that has the date part that is one month before the current date, and the time part of 00:00:00.

    LocalDateTimeLastYear

    Returns the DateTime value that has the date part that is the first day of the previous year, and the time part of 00:00:00.

    LocalDateTimeYearBeforeToday

    Returns the DateTime value with the date part that is the date one year ago, and the time part of 00:00:00.

    IsOutlookIntervalBeyondThisYear

    The Boolean Is Beyond This Year operator for date/time values. Requires one argument.

    The operator is defined as follows: date >= First Day of Next Year

    IsOutlookIntervalLaterThisYear

    The Boolean Is Later This Year operator for date/time values. Requires one argument.

    The operator is defined as follows: First Day of Next Month <= date < First Day of Next Year

    IsOutlookIntervalLaterThisMonth

    The Boolean Is Later This Month operator for date/time values. Requires one argument.

    The operator is defined as follows: Last Day of Next Week < date < First Day of Next Month

    IsOutlookIntervalNextWeek

    The Boolean Is Next Week operator for date/time values. Requires one argument.

    The operator is defined as follows: First Day of Next Week <= date <= Last Day of Next Week

    IsOutlookIntervalLaterThisWeek

    The Boolean Is Later This Week operator for date/time values. Requires one argument.

    The operator is defined as follows: Day After Tomorrow <= date < First Day of Next Week

    IsOutlookIntervalTomorrow

    The Boolean Is Tomorrow operator for date/time values. Requires one argument.

    IsOutlookIntervalToday

    The Boolean Is Today operator for date/time values. Requires one argument.

    IsOutlookIntervalYesterday

    The Boolean Is Yesterday operator for date/time values. Requires one argument.

    IsOutlookIntervalEarlierThisWeek

    The Boolean Is Earlier This Week operator for date/time values. Requires one argument.

    The operator is defined as follows: First Day of This Week <= date < Yesterday

    IsOutlookIntervalLastWeek

    The Boolean Is Last Week operator for date/time values. Requires one argument.

    The operator is defined as follows: First Day of Last Week <= date < First Day of This Week

    IsOutlookIntervalEarlierThisMonth

    The Boolean Is Earlier This Month operator for date/time values. Requires one argument.

    The operator is defined as follows: First Day of This Month <= date < First Day of Last Week

    IsOutlookIntervalEarlierThisYear

    The Boolean Is Earlier This Year operator for date/time values. Requires one argument.

    The operator is defined as follows: First Day of This Year <= date < First Day of This Month

    IsOutlookIntervalPriorThisYear

    The Boolean Is Prior This Year operator for date/time values. Requires one argument.

    The operator is defined as follows: date < First Day of This Year

    IsThisWeek

    Returns True if the specified date falls within the current week.

    IsThisMonth

    Returns True if the specified date falls within the current month.

    To create the IsThisMonth operator using the CriteriaOperator.Parse method, use the following syntax: CriteriaOperator.Parse(“IsThisMonth(StartDate)”).

    IsThisYear

    Returns True if the specified date falls within the current year.

    IsNextMonth

    Returns True if the specified date falls within the next month.

    IsNextYear

    Returns True if the specified date falls within the next year.

    IsLastMonth

    Returns True if the specified date falls within the previous month.

    IsLastYear

    Returns True if the specified date falls within the previous year.

    IsYearToDate

    Returns True if the specified date falls within the period that starts from the first day of the current year and continues until the current date (including the current date).

    IsSameDay

    Returns True if the specified date/time value falls within the same day.

    To create the IsSameDay operator using the CriteriaOperator.Parse method, use the following syntax: CriteriaOperator.Parse(“IsSameDay(StartDate)”).

    InRange

    Returns True if the specified numeric value is in the range between the FromValue and ToValue arguments; otherwise, False. The InRange(Value, FromValue, ToValue) filter is equivalent to the FromValue <= Value && Value < ToValue expression.

    The operands are:

    • Value - the numeric value to compare.

    • FromValue - the minimum value.

    • ToValue - the maximum value.

    InDateRange

    Returns True if the specified date is between FromDate and ToDate; otherwise, False. The InDateRange(Date, FromDate, ToDate) filter is equivalent to the FromDate <= Date && Value < Date expression.

    The operands are:

    For DateTime values, the start and end parameters store the selected day’s midnight time. For instance, if you use 3/1/2023, the DateTime value is 3/1/2023 00:00:00. If your date fields include non-midnight times, records for the 3/1/2023 end date are excluded from the report. To include data for 3/1/2023, use the next day as the end parameter value (3/2/2023)

    IsJanuary

    Returns True if the specified date falls within January.

    IsFebruary

    Returns True if the specified date falls within February.

    IsMarch

    Returns True if the specified date falls within March.

    IsApril

    Returns True if the specified date falls within April.

    IsMay

    Returns True if the specified date falls within May.

    IsJune

    Returns True if the specified date falls within June.

    IsJuly

    Returns True if the specified date falls within July.

    IsAugust

    Returns True if the specified date falls within August.

    IsSeptember

    Returns True if the specified date falls within September.

    IsOctober

    Returns True if the specified date falls within October.

    IsNovember

    Returns True if the specified date falls within November.

    IsDecember

    Returns True if the specified date falls within December.

    DateDiffTick

    Returns the number of tick boundaries between the specified dates.

    The operands are:

    1 - the DateTime value that is the start date.

    2 - the DateTime value that is the end date.

    DateDiffSecond

    Returns the number of second boundaries between the specified dates/times.

    The operands are:

    1 - the DateTime/TimeOnly value that is the start date.

    2 - the DateTime/TimeOnly value that is the end date.

    DateDiffMilliSecond

    Returns the number of millisecond boundaries between the specified dates/times.

    The operands are:

    1 - the DateTime/TimeOnly value that is the start date.

    2 - the DateTime/TimeOnly value that is the end date.

    DateDiffMinute

    Returns the number of minute boundaries between the specified dates/times.

    The operands are:

    1 - the DateTime/TimeOnly value that is the start date.

    2 - the DateTime/TimeOnly value that is the end date.

    DateDiffHour

    Returns the number of hour boundaries between the specified dates/times.

    The operands are:

    1 - the DateTime/TimeOnly value that is the start date.

    2 - the DateTime/TimeOnly value that is the end date.

    DateDiffDay

    Returns the number of day boundaries between the specified dates.

    The operands are:

    1 - the DateTime/DateOnly value that is the start date.

    2 - the DateTime/DateOnly value that is the end date.

    DateDiffMonth

    Returns the number of month boundaries between the specified dates.

    The operands are:

    1 - the DateTime/DateOnly value that is the start date.

    2 - the DateTime/DateOnly value that is the end date.

    DateDiffYear

    Returns the number of year boundaries between the specified dates.

    The operands are:

    1 - the DateTime/DateOnly value that is the start date.

    2 - the DateTime/DateOnly value that is the end date.

    GetDate

    Returns the date part of the specified date.

    The operand must be of the DateTime/ DateOnly type.

    The return value is a DateTime object with the same date part where the time part is 00:00:00, or DateOnly. The return value type depends on the operand type.

    GetMilliSecond

    Returns the milliseconds value in the specified date/time.

    The operand must be of the DateTime/TimeOnly type.

    The return value is an integer in the range between 0 and 999.

    GetSecond

    Returns the seconds value in the specified date/time.

    The operand must be of the DateTime/TimeOnly type.

    The return value is an integer in the range between 0 and 59.

    GetMinute

    Returns the minutes value in the specified date/time.

    The operand must be of the DateTime/TimeOnly type.

    The return value is an integer in the range between 0 and 59.

    GetHour

    Returns the hours value in the specified date/time.

    The operand must be of the DateTime/TimeOnly type.

    The return value is an integer in the range between 0 and 23.

    GetDay

    Gets the day of the month in the specified date.

    The operand must be of the DateTime/DateOnly type.

    The return value is an integer in the range between 1 and 31.

    GetMonth

    Gets the month in the specified date.

    The operand must be of the DateTime/DateOnly type.

    The return value is an integer and depends on the current calendar.

    GetYear

    Gets the year in the specified date.

    The operand must be of the DateTime/DateOnly type.

    The return value is an integer in the range between 1 and 9999.

    GetDayOfWeek

    Gets the day of the week in the specified date.

    The operand must be of the DateTime/DateOnly type.

    The return value is an integer value of the DayOfWeek enumeration. It does not depend on the current culture.

    GetDayOfYear

    Gets the day of the year in the specified date.

    The operand must be of the DateTime/DateOnly type.

    The return value is an integer in the range between 1 and 366.

    GetTimeOfDay

    Gets the time part of the specified date.

    The operand must be of the DateTime type.

    The return value is the Int64 object that is the number of 100-nanosecond ticks that have elapsed since midnight.

    Now

    Returns the DateTime value that is the current date and time.

    UtcNow

    Returns a DateTime object that is the current date and time in Universal Coordinated Time (UTC).

    Today

    Returns a DateTime value that is the current date. The time part is set to 00:00:00.

    TruncateToMinute

    For internal use.

    GetTime

    Returns the time part of the specified date or time.

    The operand must be of the DateTime/ TimeOnly type.

    The return value is a TimeOnly object.

    IsSameHour

    Returns True if the specified time falls within the same hour.

    IsSameTime

    Returns True if the specified time falls within the same time of day (hour and minute).

    InTimeRange

    Returns True if the specified time is in the range between the FromTime and ToTime arguments, including cases where the range spans across midnight such as 23:00-01:00. Otherwise, returns False. The InRange(Time, FromTime, ToTime) filter is equivalent to the FromTime <= Time && Time < ToTime expression.

    The operands are:

    OutOfTimeRange

    Returns True if the specified time outside the range between the FromTime and ToTime arguments, including cases where the range spans across midnight such as 23:00-01:00. The InRange(Time, FromTime, ToTime) filter is equivalent to the FromTime > Time || Time => ToTime expression.

    The operands are:

    BeforeMidday

    Returns True if the specified time is before 12:00 PM.

    AfterMidday

    Returns True if the specified time is after 12:00 PM.

    IsNight

    Returns True if the specified time falls between 9:00 PM and 9:00 AM.

    IsMorning

    Returns True if the specified time falls within between 6:00 AM and 12:00 PM.

    IsAfternoon

    Returns True if the specified time falls between 12:00 PM and 6:00 PM.

    IsEvening

    Returns True if the specified time falls between 6:00 PM and 9:00 PM.

    IsLastHour

    Returns True if the specified time falls within the last hour.

    IsThisHour

    Returns True if the specified time falls within the hour.

    IsNextHour

    Returns True if the specified time falls within the next hour.

    IsWorkTime

    Returns True if the specified time falls within work time.

    IsFreeTime

    Returns True if the specified time falls within free time.

    IsLunchTime

    Returns True if the specified time falls within the lunch time.

    AddTimeSpan

    Returns a DateTime value that differs by a specified amount of time from a specified date.

    The operands are:

    1 - the DateTime value that is the start date.

    2 - the TimeSpan object that is the time period before or after the start date.

    AddTicks

    Returns a DateTime value that is the specified number of ticks before or after a specified start date.

    The operands are:

    1 - the DateTime value that is the start date.

    2 - the integer number that is the number of 100-nanosecond ticks. This number can be negative or positive.

    AddMilliSeconds

    Returns a DateTime/TimeOnly value that is the specified number of milliseconds before or after a specified start date/time.

    The operands are:

    1 - the DateTime/TimeOnly value that is the start date.

    2 - the Double value that is the number of milliseconds before or after the start date. This number can be negative or positive. Its decimal part is a fraction of a millisecond.

    AddSeconds

    Returns a DateTime/TimeOnly value that is the specified number of seconds before or after a specified start date/time.

    The operands are:

    1 - the DateTime/TimeOnly value that is the start date.

    2 - the Double value that is the number of seconds before or after the start date. This number can be negative or positive. Its decimal part is a fraction of a second.

    AddMinutes

    Returns a DateTime/TimeOnly value that is the specified number of minutes before or after a specified start date/time.

    The operands are:

    1 - the DateTime/TimeOnly value that is the start date.

    2 - the Double value that is the number of minutes before or after the start date. This number can be negative or positive. Its decimal part is a fraction of a minute.

    AddHours

    Returns a DateTime/TimeOnly value that is the specified number of hours before or after a specified start date/time.

    The operands are:

    1 - the DateTime/TimeOnly value that is the start date.

    2 - the Double value that is the number of hours before or after the start date. This number can be negative or positive. Its decimal part is a fraction of an hour.

    AddDays

    Returns a DateTime/DateOnly value that is the specified number of days before or after a specified start date.

    The operands are:

    1 - the DateTime/DateOnly value that is the start date.

    2 - the Double value that is the number of days before or after the start date. This number can be negative or positive. Its decimal part is a fraction of a day.

    AddMonths

    Returns a DateTime/DateOnly value that is the specified number of months before or after a specified start date.

    The operands are:

    1 - the DateTime/DateOnly value that is the start date.

    2 - the integer value that is the number of months before or after the start date. This number can be negative or positive.

    AddYears

    Returns a DateTime/DateOnly value that is the specified number of years before or after a specified start date.

    The operands are:

    1 - the DateTime/DateOnly value that is the start date.

    2 - the integer value that is the number of years before or after the start date. This number can be negative or positive.

    DateTimeFromParts

    Returns a date value constructed from the specified Year, Month, Day, Hour, Minute, Second, and Millisecond.

    The operands are:

    1 - (Required) - an integer value that is the full year value (four digits, century included).

    2 - (Required) - an integer value that is the month number (1-12).

    3 - (Required) - an integer value that is the day of the month (1-31).

    4 - (Optional) - an hour value in 24-hour format (0-23).

    5 - (Optional) - a minute value (0-59).

    6 - (Optional) - a second value (0-59).

    7 - (Optional) - a millisecond value.

    DateOnlyFromParts

    Returns a DateOnly value constructed from the specified Year, Month, and Day.

    The operands are:

    1 - an integer value that is the full year value (four digits, century included).

    2 - an integer value that is the month number (1-12).

    3 - an integer value that is the day of the month (1-31).

    TimeOnlyFromParts

    Returns a TimeOnly value constructed from the specified hour, minute, seconds (optional), and milliseconds (optional).

    Remarks

    Filter expressions support predefined and custom function-based comparison operators. To get a function-based operator type, use the FunctionType property. If the FunctionOperatorType enumeration does not contain the current operator type, the FunctionType property value is None.

    For a function-based operator, the Operation property gets the Function value.

    The example below demonstrates how to process FunctionType property values to keep only the “Is January” and “Is February” operators visible.

    FunctionType Property

    <dx:ASPxFilterControl ID="filter" runat="server" 
        OnOperationVisibility="filter_OperationVisibility">
        <Columns>
            <dx:FilterControlColumn PropertyName="Date" ColumnType="DateTime" />
            <!--...-->
        </Columns>
    </dx:ASPxFilterControl>
    
    using DevExpress.Web;
    using DevExpress.Data.Filtering;
    using DevExpress.Data.Filtering.Helpers;
    
    protected void filter_OperationVisibility(object sender, FilterControlOperationVisibilityEventArgs e)
    {
        if (!(e.Operation == ClauseType.Function &&
             (e.FunctionType == FunctionOperatorType.IsJanuary || 
              e.FunctionType == FunctionOperatorType.IsFebruary))) {
            e.Visible = false;
        }
    }
    

    Supported Function-Based Operators

    A filter control supports any operator type from the FunctionOperatorType enumeration to specify a filter expression in the Text tab or in code.

    In the Visual tab, the control displays function-based operators of the following types:

    • IsSameDay
    • IsThisMonth
    • IsThisWeek
    • IsThisYear
    • IsNextMonth
    • IsNextYear
    • IsLastMonth
    • IsLastYear
    • IsYearToDate
    • IsJanuary
    • IsFebruary
    • IsMarch
    • IsApril
    • IsMay
    • IsJune
    • IsJuly
    • IsAugust
    • IsSeptember
    • IsOctober
    • IsNovember
    • IsDecember
    See Also