GetExpirationMaxCount Method (StreamLayer)

In This Topic

Gets the expiration maximum feature count. This method must be called on the MCT. Use QueuedTask.Run.

Syntax

C#
Visual Basic (Declaration)

public ulong GetExpirationMaxCount()

Public Function GetExpirationMaxCount() As ULong

Return Value

The System.UInt64 indicating the ExpirationMaxCount

Exceptions

Exception	Description
ArcGIS.Core.CalledOnWrongThreadException	This method or property must be called within the lambda passed to QueuedTask.Run.
System.InvalidOperationException	Stream service data connection is null.

Remarks

When FeatureLayer.IsTrackAware is true, ExpirationMaxCount represents the maximum number of features that will be stored per track. Otherwise, it represents the maximum number of features.

Example

Set Various Stream Layer properties via the CIM

//The layer must be track aware and spatial
if (streamLayer.TrackType != TrackType.Spatial)
  return;
//Must be on QueuedTask
//get the CIM Definition
var def = streamLayer.GetDefinition() as CIMFeatureLayer;
//set the number of previous observations, 
def.PreviousObservationsCount = (int)streamLayer.GetExpirationMaxCount() - 1;
//set show previous observations and track lines to true
def.ShowPreviousObservations = true;
def.ShowTracks = true;
//commit the changes
streamLayer.SetDefinition(def);

Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

Reference

StreamLayer Class
StreamLayer Members

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