private async void QueryMapAreas()
{
try
{
// Clear existing overlays
_mapViewService.ClearOverlays();
// Clear existing areas (in case user wants to refresh results)
MapAreas.Clear();
// Create new task to
var offlineMapTask = await OfflineMapTask.CreateAsync(Map);
// Get list of areas
IReadOnlyList <PreplannedMapArea> preplannedMapAreas = await offlineMapTask.GetPreplannedMapAreasAsync();
// Create UI from the areas
foreach (var preplannedMapArea in preplannedMapAreas.OrderBy(x => x.PortalItem.Title))
{
// Load area to get the metadata
await preplannedMapArea.LoadAsync();
// Using a custom model for easier visualization
var model = new MapAreaModel(preplannedMapArea);
MapAreas.Add(model);
// Graphic that shows the area in the map
var graphic = new Graphic(preplannedMapArea.AreaOfInterest, GetSymbolForColor(model.DisplayColor));
graphic.Attributes.Add("Name", preplannedMapArea.PortalItem.Title);
_areasOverlay.Graphics.Add(graphic);
}
if (!preplannedMapAreas.Any())
{
await _windowService.ShowAlertAsync("No preplanned map areas available.");
}
else
{
// Show the overlays on the map
_mapViewService.AddGraphicsOverlay(_areasOverlay);
// Zoom to the offline areas
await _mapViewService.SetViewpointGeometryAsync(_areasOverlay.Extent, 20);
}
// Refresh commands
RefreshCommands();
}
catch (Exception ex)
{
await _windowService.ShowAlertAsync(ex.Message, "Couldn't query map areas");
}
}
