AF SDK Reference

AFDataCache.ObservePendingChanges Method

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AFDataCache.ObservePendingChanges Method

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Last UpdatedNov 18, 2025
2 minute read

Observes a set of changes from the server and prepares to update the AFDataPipe to reflect them.

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

Syntax

public AFDataPipeUpdateToken ObservePendingChanges(
	IEnumerable<AFChangeInfo> pendingChanges
)

Public Function ObservePendingChanges ( 
	pendingChanges As IEnumerable(Of AFChangeInfo)
) As AFDataPipeUpdateToken

Dim instance As AFDataCache
Dim pendingChanges As IEnumerable(Of AFChangeInfo)
Dim returnValue As AFDataPipeUpdateToken

returnValue = instance.ObservePendingChanges(pendingChanges)

public:
AFDataPipeUpdateToken^ ObservePendingChanges(
	IEnumerable<AFChangeInfo>^ pendingChanges
)

member ObservePendingChanges : 
        pendingChanges : IEnumerable<AFChangeInfo> -> AFDataPipeUpdateToken

Parameters

pendingChanges: Type: System.Collections.GenericIEnumerableAFChangeInfo
The changes to observe.

Return Value

Type: AFDataPipeUpdateToken
A token that can be used to process the changes after they have been loaded into the client. The token also reports which AFAttributes might be affected by the changes.

Remarks

This call must be made before calling Refresh(PISystem, IEnumerableAFChangeInfo) on the specified changes.

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, 2.7.5, 2.7

AF SDK Reference