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AF SDK Reference

AFDataReference.SummaryAsync Method

  • Last UpdatedNov 18, 2025
  • 3 minute read
AFDataReference.SummaryAsync Method
Returns several summaries for a single attribute over a single time range.

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

Syntax

public virtual Task<IDictionary<AFSummaryTypes, AFValue>> SummaryAsync(
	AFTimeRange timeRange,
	AFSummaryTypes summaryType,
	AFCalculationBasis calculationBasis,
	AFTimestampCalculation timeType,
	CancellationToken cancellationToken
)
Public Overridable Function SummaryAsync ( 
	timeRange As AFTimeRange,
	summaryType As AFSummaryTypes,
	calculationBasis As AFCalculationBasis,
	timeType As AFTimestampCalculation,
	cancellationToken As CancellationToken
) As Task(Of IDictionary(Of AFSummaryTypes, AFValue))

Dim instance As AFDataReference
Dim timeRange As AFTimeRange
Dim summaryType As AFSummaryTypes
Dim calculationBasis As AFCalculationBasis
Dim timeType As AFTimestampCalculation
Dim cancellationToken As CancellationToken
Dim returnValue As Task(Of IDictionary(Of AFSummaryTypes, AFValue))

returnValue = instance.SummaryAsync(timeRange, 
	summaryType, calculationBasis, timeType, 
	cancellationToken)
public:
virtual Task<IDictionary<AFSummaryTypes, AFValue^>^>^ SummaryAsync(
	AFTimeRange timeRange, 
	AFSummaryTypes summaryType, 
	AFCalculationBasis calculationBasis, 
	AFTimestampCalculation timeType, 
	CancellationToken cancellationToken
)
abstract SummaryAsync : 
        timeRange : AFTimeRange * 
        summaryType : AFSummaryTypes * 
        calculationBasis : AFCalculationBasis * 
        timeType : AFTimestampCalculation * 
        cancellationToken : CancellationToken -> Task<IDictionary<AFSummaryTypes, AFValue>> 
override SummaryAsync : 
        timeRange : AFTimeRange * 
        summaryType : AFSummaryTypes * 
        calculationBasis : AFCalculationBasis * 
        timeType : AFTimestampCalculation * 
        cancellationToken : CancellationToken -> Task<IDictionary<AFSummaryTypes, AFValue>> 

Parameters

timeRange
Type: OSIsoft.AF.TimeAFTimeRange
The time range over which to compute the summary.
summaryType
Type: OSIsoft.AF.DataAFSummaryTypes
A flag which specifies one or more summaries to compute 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 timestamp for each interval.
cancellationToken
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, AFValue
Returns a task whose result is a dictionary of AFValue, indexed by the specific AFSummaryTypes.

Exceptions

ExceptionCondition
AggregateException Asynchronous methods throw AggregateException on failure which will contain one or more exceptions containing the failure.

Remarks

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

In This Topic
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