public class DisplayUnitFormat : ArcGIS.Desktop.Framework.Contracts.PropertyChangedBase, System.ComponentModel.INotifyPropertyChanged  

{
    //var map = MapView.Active.Map;
    //Note: Must be on the QueuedTask.Run()

    //Get the current location unit
    var loc_unit = map.GetLocationUnitFormat();
    var line = $"{loc_unit.DisplayName}, {loc_unit.UnitCode}";
    System.Diagnostics.Debug.WriteLine(line);
}

{
    //Linear location unit formats are not included if the map sr
    //is geographic.
    //Note: Must be on the QueuedTask.Run()
    var loc_units = map.GetAvailableLocationUnitFormats();
}

{
    //Get the current view camera location
    var center_pt = new Coordinate2D(mapView.Camera.X, mapView.Camera.Y);
    //Get the current location unit
    //Note: Must be on the QueuedTask.Run()
    var loc_unit = map.GetLocationUnitFormat();

    //Format the camera location
    var str = loc_unit.FormatLocation(center_pt, map.SpatialReference);
    System.Diagnostics.Debug.WriteLine($"Formatted location: {str}");
}

{
    //Get the list of available location unit formats
    //for the current map
    //Note: Must be on the QueuedTask.Run()
    var loc_units = map.GetAvailableLocationUnitFormats();

    //arbitrarily use the last unit in the list
    map.SetLocationUnitFormat(loc_units.Last());
}

{
    var elev_unit = map.GetElevationUnitFormat();
    var line = $"{elev_unit.DisplayName}, {elev_unit.UnitCode}";
    System.Diagnostics.Debug.WriteLine(line);
}

{
    //If the map is not a scene, the list of current
    //Project distance units will be returned
    //Note: Must be on the QueuedTask.Run()
    var elev_units = map.GetAvailableElevationUnitFormats();
}

{
    //Get the current elevation unit. If the map is not
    //a scene the default Project distance unit is returned
    //Note: Must be on the QueuedTask.Run()
    var elev_unit = map.GetElevationUnitFormat();

    //Format the view camera elevation
    var str = elev_unit.FormatValue(mapView.Camera.Z);

    System.Diagnostics.Debug.WriteLine($"Formatted elevation: {str}");
}

{
    //Trying to set the elevation unit on a map other than
    //a scene will throw an InvalidOperationException
    if (map.IsScene)
    {
        //Get the list of available elevation unit formats
        //for the current map
        var loc_units = map.GetAvailableElevationUnitFormats();
        //arbitrarily use the last unit in the list
        //Note: Must be on the QueuedTask.Run()
        map.SetElevationUnitFormat(loc_units.Last());
    }
}