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AF SDK Reference

PIPoint.SummariesAsync Method (IList(AFTimeIntervalDefinition), Boolean, AFSummaryTypes, AFCalculationBasis, AFTimestampCalculation, CancellationToken)

PIPoint.SummariesAsync Method (IList(AFTimeIntervalDefinition), Boolean, AFSummaryTypes, AFCalculationBasis, AFTimestampCalculation, CancellationToken)

  • Last UpdatedNov 18, 2025
  • 4 minute read
PIPoint.SummariesAsync Method (IList(AFTimeIntervalDefinition), Boolean, AFSummaryTypes, AFCalculationBasis, AFTimestampCalculation, CancellationToken)
Returns several summaries for a single PIPoint over a time range for each interval within the range.

Namespace:  OSIsoft.AF.PI
Assembly:  OSIsoft.AFSDK (in OSIsoft.AFSDK.dll) Version: 3.1.1.1182

Syntax

public Task<IDictionary<AFSummaryTypes, AFValues>> SummariesAsync(
	IList<AFTimeIntervalDefinition> intervalDefinitions,
	bool reverseTime,
	AFSummaryTypes summaryType,
	AFCalculationBasis calculationBasis,
	AFTimestampCalculation timeType,
	CancellationToken cancellationToken = default
)
Public Function SummariesAsync ( 
	intervalDefinitions As IList(Of AFTimeIntervalDefinition),
	reverseTime As Boolean,
	summaryType As AFSummaryTypes,
	calculationBasis As AFCalculationBasis,
	timeType As AFTimestampCalculation,
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of IDictionary(Of AFSummaryTypes, AFValues))

Dim instance As PIPoint
Dim intervalDefinitions As IList(Of AFTimeIntervalDefinition)
Dim reverseTime As Boolean
Dim summaryType As AFSummaryTypes
Dim calculationBasis As AFCalculationBasis
Dim timeType As AFTimestampCalculation
Dim cancellationToken As CancellationToken
Dim returnValue As Task(Of IDictionary(Of AFSummaryTypes, AFValues))

returnValue = instance.SummariesAsync(intervalDefinitions, 
	reverseTime, summaryType, calculationBasis, 
	timeType, cancellationToken)
public:
Task<IDictionary<AFSummaryTypes, AFValues^>^>^ SummariesAsync(
	IList<AFTimeIntervalDefinition>^ intervalDefinitions, 
	bool reverseTime, 
	AFSummaryTypes summaryType, 
	AFCalculationBasis calculationBasis, 
	AFTimestampCalculation timeType, 
	CancellationToken cancellationToken = CancellationToken()
)
member SummariesAsync : 
        intervalDefinitions : IList<AFTimeIntervalDefinition> * 
        reverseTime : bool * 
        summaryType : AFSummaryTypes * 
        calculationBasis : AFCalculationBasis * 
        timeType : AFTimestampCalculation * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _cancellationToken = defaultArg cancellationToken new CancellationToken()
*)
-> Task<IDictionary<AFSummaryTypes, AFValues>> 

Parameters

intervalDefinitions
Type: System.Collections.GenericIListAFTimeIntervalDefinition
The list of time interval definitions used to produce the summary. The Range of each time interval definition within the list must be in consecutive order to produce the expected result. Any overlaps or gaps in the intervals will be ignored.
reverseTime
Type: SystemBoolean
If set to , the results in each collection of AFValues will be returned in reverse order.
summaryType
Type: OSIsoft.AF.DataAFSummaryTypes
A flag which specifies one or more summaries to compute for each interval over the time range
calculationBasis
Type: OSIsoft.AF.DataAFCalculationBasis
Specifies the method of evaluating the data over the time range.
timeType
Type: OSIsoft.AF.DataAFTimestampCalculation
A flag indicating what how to calculate a time stamp for each interval.
cancellationToken (Optional)
Type: System.ThreadingCancellationToken
A cancellation token used to abort processing before completion. Passing the default CancellationToken.None will run to completion or until the PIConnectionInfo.OperationTimeOut period elapses.

Return Value

Type: TaskIDictionaryAFSummaryTypes, AFValues
Returns a task whose result is a dictionary of AFValues, indexed by the specific AFSummaryTypes.

Exceptions

ExceptionCondition
AggregateException Asynchronous methods throw AggregateException on failure which will contain one or more exceptions containing the failure.
ArgumentOutOfRangeExceptionThe summaryType cannot be None.
PIExceptionError returned by the PI Data Archive.

Remarks

Important note Important
Impersonation of AF SDK asynchronous calls relies on the .NET framework's built-in support for flowing execution context across asynchronous points. When making these calls while impersonating, the thread or runtime must be configured to propagate the impersonation across these asynchronous points (see the SecurityContext documentation for details).

Note Notes to Callers
This call might use a background task to complete some of its work. See the Threading Overview for some matters to consider when execution transitions to another thread.

Version Information

AFSDK

Supported in: 3.1.1, 3.1.0, 3.0.2, 3.0.1, 3.0.0, 2.10.11, 2.10.5, 2.10.0, 2.10, 2.9.5, 2.9, 2.8.5, 2.8

See Also

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