ArcGIS Pro 3.3 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / FeatureLayer Class / ArePreviousObservationsVisible Property
Example

In This Topic
    ArePreviousObservationsVisible Property
    In This Topic
    Gets whether Previous Observations will be displayed.
    Syntax
    public bool ArePreviousObservationsVisible {get;}
    Public ReadOnly Property ArePreviousObservationsVisible As Boolean
    Example
    Check Previous Observation and Track Line Visibility
    //The layer must be track aware and spatial for these settings
    //to have an effect
    if (streamLayer.TrackType != TrackType.Spatial)
      return;
    //Must be on QueuedTask
    if (!streamLayer.AreTrackLinesVisible)
      streamLayer.SetTrackLinesVisibility(true);
    if (!streamLayer.ArePreviousObservationsVisible)
      streamLayer.SetPreviousObservationsVisibility(true);
    
    Make Track Lines and Previous Observations Visible
    //The layer must be track aware and spatial for these settings
    //to have an effect
    if (streamLayer.TrackType != TrackType.Spatial)
      return;
    
    //Must be on QueuedTask
    
    //Note: Setting PreviousObservationsCount larger than the 
    //"SetExpirationMaxCount()" has no effect
    streamLayer.SetPreviousObservationsCount(6);
    if (!streamLayer.AreTrackLinesVisible)
      streamLayer.SetTrackLinesVisibility(true);
    if (!streamLayer.ArePreviousObservationsVisible)
      streamLayer.SetPreviousObservationsVisibility(true);
    Requirements

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3 or higher.
    See Also