private async void AddAssociations()
{
try
{
// Check if the current viewpoint is outside of the max scale.
if (_myMapView.GetCurrentViewpoint(ViewpointType.CenterAndScale)?.TargetScale >= _maxScale)
{
return;
}
// Check if the current viewpoint has an extent.
Envelope extent = _myMapView.GetCurrentViewpoint(ViewpointType.BoundingGeometry)?.TargetGeometry?.Extent;
if (extent == null)
{
return;
}
// Get all of the associations in extent of the viewpoint.
IEnumerable <UtilityAssociation> associations = await _utilityNetwork.GetAssociationsAsync(extent);
foreach (UtilityAssociation association in associations)
{
// Check if the graphics overlay already contains the association.
if (_associationsOverlay.Graphics.Any(g => g.Attributes.ContainsKey("GlobalId") && (Guid)g.Attributes["GlobalId"] == association.GlobalId))
{
continue;
}
// Add a graphic for the association.
Graphic graphic = new Graphic(association.Geometry);
graphic.Attributes["GlobalId"] = association.GlobalId;
graphic.Attributes["AssociationType"] = association.AssociationType.ToString();
_associationsOverlay.Graphics.Add(graphic);
}
}
// This is thrown when there are too many associations in the extent.
catch (TooManyAssociationsException)
{
}
catch (Exception ex)
{
new AlertDialog.Builder(this).SetMessage(ex.Message).SetTitle(ex.GetType().Name).Show();
}
}