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AF SDK Reference

PIPoint.InterpolatedValuesByCountAsync Method

  • Last UpdatedNov 18, 2025
  • 3 minute read
PIPoint.InterpolatedValuesByCountAsync Method
This method returns the specified number of interpolated values evenly spaced throughout the specified timeRange.

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

Syntax

public Task<AFValues> InterpolatedValuesByCountAsync(
	AFTimeRange timeRange,
	int numberOfValues,
	string filterExpression,
	bool includeFilteredValues,
	CancellationToken cancellationToken = default
)
Public Function InterpolatedValuesByCountAsync ( 
	timeRange As AFTimeRange,
	numberOfValues As Integer,
	filterExpression As String,
	includeFilteredValues As Boolean,
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of AFValues)

Dim instance As PIPoint
Dim timeRange As AFTimeRange
Dim numberOfValues As Integer
Dim filterExpression As String
Dim includeFilteredValues As Boolean
Dim cancellationToken As CancellationToken
Dim returnValue As Task(Of AFValues)

returnValue = instance.InterpolatedValuesByCountAsync(timeRange, 
	numberOfValues, filterExpression, 
	includeFilteredValues, cancellationToken)
public:
Task<AFValues^>^ InterpolatedValuesByCountAsync(
	AFTimeRange timeRange, 
	int numberOfValues, 
	String^ filterExpression, 
	bool includeFilteredValues, 
	CancellationToken cancellationToken = CancellationToken()
)
member InterpolatedValuesByCountAsync : 
        timeRange : AFTimeRange * 
        numberOfValues : int * 
        filterExpression : string * 
        includeFilteredValues : bool * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _cancellationToken = defaultArg cancellationToken new CancellationToken()
*)
-> Task<AFValues> 

Parameters

timeRange
Type: OSIsoft.AF.TimeAFTimeRange
The start and end time covered by the request.
numberOfValues
Type: SystemInt32
The number of interpolated values to return even spaced throughout the timeRange.
filterExpression
Type: SystemString
A filter expression that follows the performance equation syntax.
includeFilteredValues
Type: SystemBoolean
Specify to indicate that values which fail the filter criteria are present in the returned data at the times where they occurred with a value set to a "Filtered" enumeration value with bad status. Repeated consecutive failures are omitted.
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: TaskAFValues
Returns a task whose result is an AFValues collection with the interpolated values.

Exceptions

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

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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