public override void RowSelected(UITableView tableView, NSIndexPath indexPath)
{
PreplannedMapArea selectedMap = _maps[indexPath.Row];
// Notify subscribers of the new selection.
RaiseMapAreaSelected(selectedMap);
}
private async void OnDownloadMapAreaClicked(object sender, RoutedEventArgs e)
{
if (AreasList.SelectedItem != null)
{
PreplannedMapArea selectedMapArea = AreasList.SelectedItem as PreplannedMapArea;
await DownloadMapAreaAsync(selectedMapArea);
}
}
private void _mapAreaViewModel_MapSelected(object sender, PreplannedMapArea area)
{
// Dismiss the table view.
_tableDisplayController.DismissViewController(true, null);
// Download the map area.
DownloadMapAreaAsync(area);
}
private async void OnDownloadMapAreaClicked(object sender, RoutedEventArgs e)
{
// Return if selection is being cleared.
if (PreplannedAreasList.SelectedIndex == -1)
{
return;
}
// Download and show the map.
PreplannedMapArea selectedMapArea = PreplannedAreasList.SelectedItem as PreplannedMapArea;
await DownloadMapAreaAsync(selectedMapArea);
}
private void AreaSelected(object sender, SelectedItemChangedEventArgs e)
{
PreplannedMapArea selectedMapArea = e.SelectedItem as PreplannedMapArea;
string path = Path.Combine(_offlineDataFolder, selectedMapArea.PortalItem.Title);
if (Directory.Exists(path))
{
DownloadButton.Text = "Display";
}
else
{
DownloadButton.Text = "Download";
}
}
private async void OnMenuDownloadMapAreaClicked(object sender, RoutedEventArgs e)
{
// Get the sending list item.
FrameworkElement element = sender as FrameworkElement;
// Get the corresponding map area.
PreplannedMapArea selectedMapArea = element?.DataContext as PreplannedMapArea;
// Update the other list in the UI for consistency (important if user resizes window to be wider).
PreplannedAreasList.SelectedItem = selectedMapArea;
// Download the map area and show it.
await DownloadMapAreaAsync(selectedMapArea);
}
private async void OnDownloadMapAreaClicked(string selectedArea)
{
try
{
// Get the selected map area.
PreplannedMapArea area = _preplannedMapAreas.First(mapArea => mapArea.PortalItem.Title.ToString() == selectedArea);
// Download and show the map.
await DownloadMapAreaAsync(area);
}
catch (Exception ex)
{
// No match found.
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.SetMessage(ex.Message).SetTitle("Downloading map area failed.").Show();
}
}
private async void OnDownloadMapAreaClicked(string selectedArea)
{
try
{
// Get the selected map area.
PreplannedMapArea area = _preplannedMapAreas.First(mapArea => mapArea.PortalItem.Title.ToString() == selectedArea);
// Download the map area.
await DownloadMapAreaAsync(area);
}
catch (Exception ex)
{
// No match found.
UIAlertController alertController = UIAlertController.Create("Downloading map area failed.", ex.Message, UIAlertControllerStyle.Alert);
alertController.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alertController, true, null);
}
}
public override UITableViewCell GetCell(UITableView tableView, NSIndexPath indexPath)
{
// Gets a cell for the specified section and row.
UITableViewCell cell = new UITableViewCell(UITableViewCellStyle.Subtitle, CellIdentifier);
PreplannedMapArea selectedMap = _maps[indexPath.Row];
cell.TextLabel.Text = selectedMap.PortalItem.Title;
try
{
NSData imgData = NSData.FromUrl(selectedMap.PortalItem.ThumbnailUri);
cell.ImageView.Image = new UIImage(imgData);
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
cell.ImageView.ContentMode = UIViewContentMode.ScaleAspectFill;
return(cell);
}
private async Task DownloadMapAreaAsync(PreplannedMapArea mapArea)
{
// Configure UI for the download.
DownloadNotificationText.Visibility = Visibility.Collapsed;
ProgressBar.IsIndeterminate = false;
ProgressBar.Value = 0;
BusyText.Text = "Downloading map area...";
BusyIndicator.Visibility = Visibility.Visible;
MyMapView.Visibility = Visibility.Visible;
// Get the path for the downloaded map area.
string path = Path.Combine(_offlineDataFolder, mapArea.PortalItem.Title);
// If the area is already downloaded, open it and don't download it again.
if (Directory.Exists(path))
{
MobileMapPackage localMapArea = await MobileMapPackage.OpenAsync(path);
try
{
// Load the map.
MyMapView.Map = localMapArea.Maps.First();
// Update the UI.
BusyText.Text = string.Empty;
BusyIndicator.Visibility = Visibility.Collapsed;
// Return and don't proceed to download.
return;
}
catch (Exception)
{
// Do nothing, continue as if map wasn't downloaded.
}
}
// Create job that is used to download the map area.
DownloadPreplannedOfflineMapJob job = _offlineMapTask.DownloadPreplannedOfflineMap(mapArea, path);
// Subscribe to progress change events to support showing a progress bar.
job.ProgressChanged += OnJobProgressChanged;
try
{
// Download the map area.
DownloadPreplannedOfflineMapResult results = await job.GetResultAsync();
// Handle possible errors and show them to the user.
if (results.HasErrors)
{
StringBuilder errorBuilder = new StringBuilder();
// Add layer errors to the message.
foreach (KeyValuePair <Layer, Exception> layerError in results.LayerErrors)
{
errorBuilder.AppendLine(string.Format("{0} {1}", layerError.Key.Name,
layerError.Value.Message));
}
// Add table errors to the message.
foreach (KeyValuePair <FeatureTable, Exception> tableError in results.TableErrors)
{
errorBuilder.AppendLine(string.Format("{0} {1}", tableError.Key.TableName,
tableError.Value.Message));
}
// Show the message.
MessageDialog message = new MessageDialog(errorBuilder.ToString(), "Warning!");
await message.ShowAsync();
}
// Show the Map in the MapView.
MyMapView.Map = results.OfflineMap;
}
catch (Exception ex)
{
// Report exception.
MessageDialog message = new MessageDialog(ex.Message, "Downloading map areas failed");
await message.ShowAsync();
}
finally
{
// Clear the loading UI.
BusyText.Text = string.Empty;
BusyIndicator.Visibility = Visibility.Collapsed;
}
}
private async Task DownloadMapAreaAsync(PreplannedMapArea mapArea)
{
// Show the download UI.
_progressIndicator.UpdateMessageAndProgress("Downloading map area", 0);
View.AddSubview(_progressIndicator);
// Get the path for the downloaded map area.
var path = Path.Combine(_offlineDataFolder, mapArea.PortalItem.Title);
// If the area is already downloaded, open it and don't download it again.
if (Directory.Exists(path))
{
var localMapArea = await MobileMapPackage.OpenAsync(path);
try
{
// Load the map.
_myMapView.Map = localMapArea.Maps.First();
// Reset the UI.
_progressIndicator.RemoveFromSuperview();
// Return without proceeding to download.
return;
}
catch (Exception)
{
// Do nothing, continue as if map wasn't downloaded.
}
}
// Create the job that is used to do the download.
DownloadPreplannedOfflineMapJob job = _offlineMapTask.DownloadPreplannedOfflineMap(mapArea, path);
// Subscribe to progress change events to support showing a progress bar.
job.ProgressChanged += OnJobProgressChanged;
try
{
// Download the map area.
DownloadPreplannedOfflineMapResult results = await job.GetResultAsync();
// Handle possible errors and show them to the user.
if (results.HasErrors)
{
var errorBuilder = new StringBuilder();
// Add layer errors to the message.
foreach (KeyValuePair <Layer, Exception> layerError in results.LayerErrors)
{
errorBuilder.AppendLine($"{layerError.Key.Name} {layerError.Value.Message}");
}
// Add table errors to the message.
foreach (KeyValuePair <FeatureTable, Exception> tableError in results.TableErrors)
{
errorBuilder.AppendLine($"{tableError.Key.TableName} {tableError.Value.Message}");
}
// Show the message.
UIAlertController alertController = UIAlertController.Create("Warning!", errorBuilder.ToString(), UIAlertControllerStyle.Alert);
alertController.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alertController, true, null);
}
// Show the Map in the MapView.
_myMapView.Map = results.OfflineMap;
}
catch (Exception ex)
{
// Report the exception.
UIAlertController alertController = UIAlertController.Create("Downloading map area failed.", ex.Message, UIAlertControllerStyle.Alert);
alertController.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alertController, true, null);
}
finally
{
// Clear the loading UI.
_progressIndicator.RemoveFromSuperview();
}
}
private async Task DownloadMapAreaAsync(PreplannedMapArea mapArea)
{
// Set up UI for downloading.
ProgressBar.IsIndeterminate = false;
ProgressBar.Value = 0;
BusyText.Text = "Downloading map area...";
BusyIndicator.Visibility = Visibility.Visible;
// Create folder path where the map package will be downloaded.
string path = Path.Combine(_offlineDataFolder, mapArea.PortalItem.Title);
// If the area is already downloaded, open it.
if (Directory.Exists(path))
{
try
{
// Open the offline map package.
MobileMapPackage localMapArea = await MobileMapPackage.OpenAsync(path);
// Display the first map.
MyMapView.Map = localMapArea.Maps.First();
// Update the UI.
BusyText.Text = string.Empty;
BusyIndicator.Visibility = Visibility.Collapsed;
MessageLabel.Text = "Opened offline area.";
return;
}
catch (Exception e)
{
Debug.WriteLine(e);
await new MessageDialog(e.Message, "Couldn't open offline area. Proceeding to take area offline.").ShowAsync();
}
}
// Create download parameters.
DownloadPreplannedOfflineMapParameters parameters = await _offlineMapTask.CreateDefaultDownloadPreplannedOfflineMapParametersAsync(mapArea);
// Create the job.
DownloadPreplannedOfflineMapJob job = _offlineMapTask.DownloadPreplannedOfflineMap(parameters, path);
// Set up event to update the progress bar while the job is in progress.
job.ProgressChanged += OnJobProgressChanged;
try
{
// Download the area.
DownloadPreplannedOfflineMapResult results = await job.GetResultAsync();
// Handle possible errors and show them to the user.
if (results.HasErrors)
{
// Accumulate all layer and table errors into a single message.
string errors = "";
foreach (KeyValuePair <Layer, Exception> layerError in results.LayerErrors)
{
errors = $"{errors}\n{layerError.Key.Name} {layerError.Value.Message}";
}
foreach (KeyValuePair <FeatureTable, Exception> tableError in results.TableErrors)
{
errors = $"{errors}\n{tableError.Key.TableName} {tableError.Value.Message}";
}
// Show the message.
await new MessageDialog(errors, "Warning!").ShowAsync();
}
// Show the downloaded map.
MyMapView.Map = results.OfflineMap;
// Update the UI.
MessageLabel.Text = "Downloaded preplanned area.";
}
catch (Exception ex)
{
// Report any errors.
Debug.WriteLine(ex);
await new MessageDialog(ex.Message, "Downloading map area failed.").ShowAsync();
}
finally
{
BusyText.Text = string.Empty;
BusyIndicator.Visibility = Visibility.Collapsed;
}
}
private async void DownloadMapAreaAsync(PreplannedMapArea mapArea)
{
// Close the current mobile package.
_mobileMapPackage?.Close();
// Set up UI for downloading.
_activityIndicator.StartAnimating();
_helpLabel.Text = "Downloading map area...";
// Create folder path where the map package will be downloaded.
string path = Path.Combine(_offlineDataFolder, mapArea.PortalItem.Title);
// If the area is already downloaded, open it.
if (Directory.Exists(path))
{
try
{
_mobileMapPackage = await MobileMapPackage.OpenAsync(path);
_myMapView.Map = _mobileMapPackage.Maps.First();
_helpLabel.Text = "Opened offline area.";
_showOnlineButton.Enabled = true;
_activityIndicator.StopAnimating();
return;
}
catch (Exception e)
{
Debug.WriteLine(e);
new UIAlertView("Couldn't open offline map area. Proceeding to take area offline.", e.ToString(), (IUIAlertViewDelegate)null, "OK", null).Show();
}
}
// Create download parameters.
DownloadPreplannedOfflineMapParameters parameters = await _offlineMapTask.CreateDefaultDownloadPreplannedOfflineMapParametersAsync(mapArea);
// Set the update mode to not receive updates.
parameters.UpdateMode = PreplannedUpdateMode.NoUpdates;
// Create the job.
DownloadPreplannedOfflineMapJob job = _offlineMapTask.DownloadPreplannedOfflineMap(parameters, path);
// Set up event to update the progress bar while the job is in progress.
job.ProgressChanged += Job_ProgressChanged;
try
{
// Download the area.
DownloadPreplannedOfflineMapResult results = await job.GetResultAsync();
// Set the current mobile map package.
_mobileMapPackage = results.MobileMapPackage;
// Handle possible errors and show them to the user.
if (results.HasErrors)
{
// Accumulate all layer and table errors into a single message.
string errors = "";
foreach (KeyValuePair <Layer, Exception> layerError in results.LayerErrors)
{
errors = $"{errors}\n{layerError.Key.Name} {layerError.Value.Message}";
}
foreach (KeyValuePair <FeatureTable, Exception> tableError in results.TableErrors)
{
errors = $"{errors}\n{tableError.Key.TableName} {tableError.Value.Message}";
}
// Show the message.
new UIAlertView("Warning!", errors, (IUIAlertViewDelegate)null, "OK", null).Show();
}
// Show the downloaded map.
_myMapView.Map = results.OfflineMap;
}
catch (Exception ex)
{
// Report any errors.
Debug.WriteLine(ex);
new UIAlertView("Downloading map area failed", ex.ToString(), (IUIAlertViewDelegate)null, "OK", null).Show();
}
finally
{
_activityIndicator.StopAnimating();
_helpLabel.Text = "Map area offline.";
_showOnlineButton.Enabled = true;
}
}
private async void GeneratePreplannedMap()
{
ArcGISPortal portal = await ArcGISPortal.CreateAsync();
string itemID = "a9081e4d02dc49f68c6202f03bfe302f";
// Get a web map item using its ID.
PortalItem webmapItem = await PortalItem.CreateAsync(portal, itemID);
// Create a map from the web map item.
Map onlineMap = new Map(webmapItem);
// Create an OfflineMapTask from the map ...
OfflineMapTask takeMapOfflineTask = await OfflineMapTask.CreateAsync(onlineMap);
// ... or a web map portal item.
//takeMapOfflineTask = await OfflineMapTask.CreateAsync(webmapItem);
// Get a list of the available preplanned map areas.
IReadOnlyList <PreplannedMapArea> preplannedMapAreaList = await takeMapOfflineTask.GetPreplannedMapAreasAsync();
// Loop through all preplanned map areas.
foreach (PreplannedMapArea mapArea in preplannedMapAreaList)
{
// Load the preplanned map area so property values can be read.
await mapArea.LoadAsync();
// Get the area of interest (geometry) for this area.
Geometry aoi = mapArea.AreaOfInterest;
// Get the portal item for this area, read the title and thumbnail image.
PortalItem preplannedMapItem = mapArea.PortalItem;
string mapTitle = preplannedMapItem.Title;
RuntimeImage areaThumbnail = preplannedMapItem.Thumbnail;
}
PreplannedMapArea downloadMapArea = preplannedMapAreaList.First();
string pathToOutputPackage = @"C:\LaurenCDrive\TL\Readiness\Trainings\RT_Offline_Workflows\PrePlannedMap";
DownloadPreplannedOfflineMapJob preplannedMapJob = takeMapOfflineTask.DownloadPreplannedOfflineMap(downloadMapArea, pathToOutputPackage);
// Generate the offline map and download it.
DownloadPreplannedOfflineMapResult preplannedMapResult = await preplannedMapJob.GetResultAsync();
if (!preplannedMapResult.HasErrors)
{
// Job completed successfully and all content was generated.
Debug.WriteLine("Map " +
preplannedMapResult.MobileMapPackage.Item.Title +
" was saved to " +
preplannedMapResult.MobileMapPackage.Path);
// Show the offline map in a MapView.
MyMapView.Map = preplannedMapResult.OfflineMap;
}
else
{
// Job is finished but one or more layers or tables had errors.
if (preplannedMapResult.LayerErrors.Count > 0)
{
// Show layer errors.
foreach (var layerError in preplannedMapResult.LayerErrors)
{
Debug.WriteLine("Error occurred when taking " +
layerError.Key.Name +
" offline. Error : " +
layerError.Value.Message);
}
}
if (preplannedMapResult.TableErrors.Count > 0)
{
// Show table errors.
foreach (var tableError in preplannedMapResult.TableErrors)
{
Debug.WriteLine("Error occurred when taking " +
tableError.Key.TableName +
" offline. Error : " +
tableError.Value.Message);
}
}
}
}
private async Task DownloadMapAreaAsync(PreplannedMapArea mapArea)
{
// Show the UI for the download.
ProgressBar.Progress = 0;
BusyText.Text = "Downloading map area...";
BusyIndicator.IsVisible = true;
MyMapView.IsVisible = true;
// Get the path for the downloaded map area.
string path = Path.Combine(_offlineDataFolder, mapArea.PortalItem.Title);
// If the area is already downloaded, open it and don't download it again.
if (Directory.Exists(path))
{
MobileMapPackage localMapArea = await MobileMapPackage.OpenAsync(path);
try
{
// Load the map.
MyMapView.Map = localMapArea.Maps.First();
// Update the UI.
BusyText.Text = string.Empty;
BusyIndicator.IsVisible = false;
// Return without proceeding to download.
return;
}
catch (Exception)
{
// Do nothing, continue as if the map wasn't downloaded.
}
}
// Create the job that is used to do the download.
DownloadPreplannedOfflineMapJob job = _offlineMapTask.DownloadPreplannedOfflineMap(mapArea, path);
// Subscribe to progress change events to support showing a progress bar.
job.ProgressChanged += OnJobProgressChanged;
try
{
// Download the map area.
DownloadPreplannedOfflineMapResult results = await job.GetResultAsync();
// Handle possible errors and show them to the user.
if (results.HasErrors)
{
StringBuilder errorBuilder = new StringBuilder();
// Add layer errors to the message.
foreach (KeyValuePair <Layer, Exception> layerError in results.LayerErrors)
{
errorBuilder.AppendLine($"{layerError.Key.Name} {layerError.Value.Message}");
}
// Add table errors to the message.
foreach (KeyValuePair <FeatureTable, Exception> tableError in results.TableErrors)
{
errorBuilder.AppendLine($"{tableError.Key.TableName} {tableError.Value.Message}");
}
// Show the message.
await((Page)Parent).DisplayAlert("Warning!", errorBuilder.ToString(), "OK");
}
// Show the Map in the MapView.
MyMapView.Map = results.OfflineMap;
}
catch (Exception ex)
{
// Report the exception.
await((Page)Parent).DisplayAlert("Downloading map area failed.", ex.Message, "OK");
}
finally
{
// Clear the loading UI.
BusyText.Text = string.Empty;
BusyIndicator.IsVisible = false;
}
}
private async Task DownloadMapAreaAsync(PreplannedMapArea mapArea)
{
// Close the current mobile package.
_mobileMapPackage?.Close();
// Set up UI for downloading.
ProgressView.Progress = 0;
BusyText.Text = "Downloading map area...";
BusyIndicator.IsVisible = true;
// Create folder path where the map package will be downloaded.
string path = Path.Combine(_offlineDataFolder, mapArea.PortalItem.Title);
// If the area is already downloaded, open it.
if (Directory.Exists(path))
{
try
{
// Open the offline map package.
_mobileMapPackage = await MobileMapPackage.OpenAsync(path);
// Open the first map in the package.
MyMapView.Map = _mobileMapPackage.Maps.First();
// Update the UI.
BusyText.Text = string.Empty;
BusyIndicator.IsVisible = false;
MessageLabel.Text = "Opened offline area.";
return;
}
catch (Exception e)
{
Debug.WriteLine(e);
await Application.Current.MainPage.DisplayAlert("Couldn't open offline area. Proceeding to take area offline.", e.Message, "OK");
}
}
// Create download parameters.
DownloadPreplannedOfflineMapParameters parameters = await _offlineMapTask.CreateDefaultDownloadPreplannedOfflineMapParametersAsync(mapArea);
// Set the update mode to not receive updates.
parameters.UpdateMode = PreplannedUpdateMode.NoUpdates;
// Create the job.
DownloadPreplannedOfflineMapJob job = _offlineMapTask.DownloadPreplannedOfflineMap(parameters, path);
// Set up event to update the progress bar while the job is in progress.
job.ProgressChanged += OnJobProgressChanged;
try
{
// Download the area.
DownloadPreplannedOfflineMapResult results = await job.GetResultAsync();
// Set the current mobile map package.
_mobileMapPackage = results.MobileMapPackage;
// Handle possible errors and show them to the user.
if (results.HasErrors)
{
// Accumulate all layer and table errors into a single message.
string errors = "";
foreach (KeyValuePair <Layer, Exception> layerError in results.LayerErrors)
{
errors = $"{errors}\n{layerError.Key.Name} {layerError.Value.Message}";
}
foreach (KeyValuePair <FeatureTable, Exception> tableError in results.TableErrors)
{
errors = $"{errors}\n{tableError.Key.TableName} {tableError.Value.Message}";
}
// Show the message.
await Application.Current.MainPage.DisplayAlert("Warning!", errors, "OK");
}
// Show the downloaded map.
MyMapView.Map = results.OfflineMap;
// Update the UI.
ShowOnlineButton.IsEnabled = true;
MessageLabel.Text = "Downloaded preplanned area.";
DownloadButton.Text = "Display";
}
catch (Exception ex)
{
// Report any errors.
Debug.WriteLine(ex);
await Application.Current.MainPage.DisplayAlert("Downloading map area failed.", ex.Message, "OK");
}
finally
{
BusyText.Text = string.Empty;
BusyIndicator.IsVisible = false;
}
}
private void RaiseMapAreaSelected(PreplannedMapArea selectedArea)
{
MapSelected?.Invoke(this, selectedArea);
}
private async Task DownloadMapAreaAsync(PreplannedMapArea mapArea)
{
// Set up UI for download.
_progressIndicator.SetMessage("Downloading map area...");
_progressIndicator.SetTitle("Downloading");
_progressIndicator.Show();
// Get the path for the downloaded map area.
string path = Path.Combine(_offlineDataFolder, mapArea.PortalItem.Title);
// If the map area is already downloaded, open it and don't download it again.
if (Directory.Exists(path))
{
MobileMapPackage localMapArea = await MobileMapPackage.OpenAsync(path);
try
{
// Load the map area.
_myMapView.Map = localMapArea.Maps.First();
// Update the UI.
_progressIndicator.Dismiss();
// Return without downloading the item again.
return;
}
catch (Exception)
{
// Do nothing, continue as if the map wasn't downloaded.
}
}
// Create the job that is used to download the map area.
DownloadPreplannedOfflineMapJob job = _offlineMapTask.DownloadPreplannedOfflineMap(mapArea, path);
// Subscribe to progress change events to support showing a progress bar.
job.ProgressChanged += OnJobProgressChanged;
try
{
// Download the map area.
DownloadPreplannedOfflineMapResult results = await job.GetResultAsync();
// Handle possible errors and show them to the user.
if (results.HasErrors)
{
StringBuilder errorBuilder = new StringBuilder();
// Add layer errors to the message.
foreach (KeyValuePair <Layer, Exception> layerError in results.LayerErrors)
{
errorBuilder.AppendLine($"{layerError.Key.Name} {layerError.Value.Message}");
}
// Add table errors to the message.
foreach (KeyValuePair <FeatureTable, Exception> tableError in results.TableErrors)
{
errorBuilder.AppendLine($"{tableError.Key.TableName} {tableError.Value.Message}");
}
// Show the error message.
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.SetMessage(errorBuilder.ToString()).SetTitle("Warning!").Show();
}
// Show the Map in the MapView.
_myMapView.Map = results.OfflineMap;
}
catch (Exception ex)
{
// Report exception.
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.SetMessage(ex.Message).SetTitle("Downloading map area failed.").Show();
}
finally
{
// Clear the loading UI.
_progressIndicator.Dismiss();
}
}
public MapAreaModel(PreplannedMapArea mapArea)
{
MapArea = mapArea;
Thumbnail = mapArea.PortalItem.ThumbnailUri != null ? new BitmapImage(mapArea.PortalItem.ThumbnailUri) : null;
}
