AF SDK Reference

AFAttributeList.GetValue Method (AFTimeRange)

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AFAttributeList.GetValue Method (AFTimeRange)

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Last UpdatedNov 18, 2025
2 minute read

This method gets the value for each attribute in the list based upon its data reference configuration and the specified AFTimeRange context.

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

Syntax

public AFValues GetValue(
	AFTimeRange timeRange
)

Public Function GetValue ( 
	timeRange As AFTimeRange
) As AFValues

Dim instance As AFAttributeList
Dim timeRange As AFTimeRange
Dim returnValue As AFValues

returnValue = instance.GetValue(timeRange)

public:
AFValues^ GetValue(
	AFTimeRange timeRange
)

member GetValue : 
        timeRange : AFTimeRange -> AFValues

Parameters

timeRange: Type: OSIsoft.AF.TimeAFTimeRange
The time range context to be used when getting the attribute's value. If the StartTime of the time range is greater than its EndTime, then the returned of the values is reversed. If the time range context is not supported by the attribute's configuration, as indicated by the SupportedContexts property, then the context will be changed to an AFTime context at the end of the time range.

Return Value

Type: AFValues
Returns the value of each AFAttribute in this list. The index or order of each value in the returned collection corresponds to the index or order of the attributes in this list.

Remarks

This routine can be a more efficient mechanism to retrieve values from many attributes than calling one of the AFAttribute.GetValue Overload methods individually. This method achieves efficiency by reducing the number of round-trips to the associated server to read the data. The data will always be returned in the DefaultUOM of the respective attribute. Each returned AFValue will have its Attribute property set to the AFAttribute associated with the value.

AF SDK Reference