/// <summary>
/// Raised when the asynchronous call to search the web has completed.
/// </summary>
private void WebSearchCompleted(object sender, OpenReadEventArgs e)
{
// Received another response, so increment the counter
_numberWebResults++;
if (e.Error == null && !_cancelled) // No error, no cancellation - handle result as normal
{
GoogleResponse result = WebUtil.ReadObject <GoogleResponse>(e.Result);
if (result != null && result.ResponseData != null && result.ResponseData.Items.Length > 0)
{
// before services from the web get added we need to check if they are accessible
foreach (WebSearchResultItem item in result.ResponseData.Items)
{
Uri url = new Uri(item.Url);
ArcGISService.GetServiceInfoAsync(item.Url, item, CheckServiceAccessCompleted);
}
return;
}
}
// There was an error, the response was empty, or the operation was cancelled. Check whether this is the last response.
if (_numberWebResults == _NUMREQUESTS)
{
// All requests have returned. Go through completeion routine.
if (!_cancelled)
{
IsSearching = false; // Reset busy state
OnSearchCompleted(); // Raise completed event
}
}
}
/// <summary>
/// Raised when the asynchronous call to check if the map service is accessible has completed.
/// </summary>
private void CheckServiceAccessCompleted(object sender, ServiceEventArgs e)
{
if (e.Service == null)
{
return; //the map service is not accessible
}
// Check the current result against the ones already received. Duplicates are often found.
bool alreadyAdded = false;
foreach (SearchResultViewModel result in _checkedResults)
{
ArcGISService webSearchRes = (ArcGISService)result.Result;
if (webSearchRes.Title.Equals(e.Service.Title) && webSearchRes.Url.Equals(e.Service.Url))
{
alreadyAdded = true; //add search results only once
break;
}
}
// If it's a new service, initialize the result viewModel and add it to the collection of
// results that have had their service access checked
if (!alreadyAdded && !_cancelled)
{
SearchResultViewModel viewModel = new SearchResultViewModel(e.Service)
{
ProxyUrl = this.UseProxy ? this.ProxyUrl : null
};
_checkedResults.Add(viewModel);
viewModel.Initialized += resultViewModel_Initialized;
viewModel.Initialize();
}
}
// Initializes the Service property
private void initializeService(Action callback)
{
if (Result is ArcGISService)
{
Service = Result as ArcGISService; // Assume service reference is valid
callback();
}
else if (Result is ArcGISPortalItem)
{
ArcGISService.GetServiceInfoAsync((string)Result.Url, null, (o, e) =>
{
Service = e.Service;
callback();
});
}
}
/// <summary>
/// Determines the map units for the map
/// </summary>
/// <param name="map">The map to find map units for</param>
/// <param name="onComplete">The method to invoke once map units have been retrieved</param>
/// <param name="onFailed">The method to invoke when map unit retrieval fails</param>
public static void GetMapUnitsAsync(this Map Map, Action <LengthUnits> onComplete,
Action onFailed = null)
{
if (Map != null)
{
Layer layer = Map.Layers.FirstOrDefault();
if (layer != null)
{
TileLayer tiledLayer = layer as TileLayer;
if (tiledLayer != null)
{
// Bing is web mercator
onComplete(LengthUnits.UnitsMeters);
}
else
{
OpenStreetMapLayer osmLayer = layer as OpenStreetMapLayer;
if (osmLayer != null)
{
// Open Streem map is web mercator
onComplete(LengthUnits.UnitsMeters);
}
else
{
// ArcGIS Server Base Map
string units = null;
string layerUrl = null;
ArcGISTiledMapServiceLayer agsTiledlayer = layer as ArcGISTiledMapServiceLayer;
if (agsTiledlayer != null)
{
units = agsTiledlayer.Units;
layerUrl = agsTiledlayer.Url;
}
else
{
ArcGISDynamicMapServiceLayer agsDynamicLayer = layer as ArcGISDynamicMapServiceLayer;
if (agsDynamicLayer != null)
{
units = agsDynamicLayer.Units;
layerUrl = agsDynamicLayer.Url;
}
else
{
ArcGISImageServiceLayer agsImageLayer = layer as ArcGISImageServiceLayer;
if (agsImageLayer != null)
{
layerUrl = agsImageLayer.Url;
}
}
}
if (!string.IsNullOrEmpty(units))
{
units = units.Replace("esri", "Units"); // replace esri prefix
if (Enum.IsDefined(typeof(LengthUnits), units))
{
onComplete((LengthUnits)Enum.Parse(typeof(LengthUnits), units, true));
}
else if (onFailed != null)
{
onFailed();
}
}
else if (!string.IsNullOrEmpty(layerUrl))
{
ArcGISService.GetServiceInfoAsync(layerUrl, null, (o, e) =>
{
if (e.Service != null && !string.IsNullOrEmpty(e.Service.Units))
{
string serviceUnits = e.Service.Units;
serviceUnits = serviceUnits.Replace("esri", "Units"); // replace esri prefix
if (Enum.IsDefined(typeof(LengthUnits), serviceUnits))
{
onComplete((LengthUnits)Enum.Parse(typeof(LengthUnits), serviceUnits, true));
}
else if (onFailed != null)
{
onFailed();
}
}
});
return;
}
}
}
}
}
}