private Feature[] Identify(IMapControl mapcontrol, ShapePoint prjPoint, double tolerance)
{
string[] layernames = GetIdentifyLayers(mapcontrol);
if (layernames == null || layernames.Length == 0)
{
return(null);
}
List <Feature> retfets = new List <Feature>();
foreach (string lyrname in layernames)
{
IFeatureLayer layer = mapcontrol.Map.LayerContainer.GetLayerByName(lyrname) as IFeatureLayer;
if (layer == null)
{
continue;
}
Feature[] fets = layer.Identify(prjPoint, tolerance);
if (fets != null)
{
retfets.AddRange(fets);
}
}
return(retfets.Count > 0 ? retfets.ToArray() : null);
}
/// <summary>
/// Performs an identify operation with the provided geometry.
/// When identifying layers, typically a small envelope is passed in rather than a point to account for differences in
/// the precision of the display and the feature geometry.
/// </summary>
/// <param name="source">The source.</param>
/// <param name="geometry">The geometry.</param>
/// <returns>
/// Returns a <see cref="IEnumerable{IFeatureIdentifyObj}" /> representing the features that have been identified.
/// </returns>
/// <exception cref="System.ArgumentNullException">geometry</exception>
/// <remarks>
/// On a FeatureIdentifyObject, you can do a QI to the IIdentifyObj interface to get more information about the
/// identified feature. The IIdentifyObj interface returns the window handle, layer, and name of the feature; it has
/// methods to flash the
/// feature in the display and to display a context menu at the Identify location.
/// </remarks>
public static IEnumerable <IFeatureIdentifyObj> Identify(this IFeatureLayer source, IGeometry geometry)
{
return(source.Identify(geometry, null));
}
/// <summary>
/// Performs an identify operation with the provided geometry.
/// When identifying layers, typically a small envelope is passed in rather than a point to account for differences in
/// the precision of the display and the feature geometry.
/// </summary>
/// <param name="source">The source.</param>
/// <param name="geometry">The geometry.</param>
/// <param name="trackCancel">
/// The cancel tracker object to monitor the Esc key and to terminate processes at the request of
/// the user.
/// </param>
/// <returns>
/// Returns a <see cref="IEnumerable{IFeatureIdentifyObj}" /> representing the features that have been identified.
/// </returns>
/// <exception cref="System.ArgumentNullException">geometry</exception>
/// <remarks>
/// On a FeatureIdentifyObject, you can do a QI to the IIdentifyObj interface to get more information about the
/// identified feature. The IIdentifyvsObj interface returns the window handle, layer, and name of the feature; it has
/// methods to flash the
/// feature in the display and to display a context menu at the Identify location.
/// </remarks>
public static IEnumerable <IFeatureIdentifyObj> IdentifyAsync(this IFeatureLayer source, IGeometry geometry, ITrackCancel trackCancel)
{
return(Task.Wait(() => source.Identify(geometry, trackCancel)));
}