GetZsFromSurfaceAsync

从表面获得

namespace BeforeSketchCompleted
{
  internal class BeforeSketchCompleted : Button
  {
    readonly string surfaceName = "Ground";
    ArcGIS.Core.Events.SubscriptionToken bscToken = null;
    
    protected override void OnClick()
    {
      //subscribe to BeforeSketchCompleted event once
      if (bscToken == null)
        bscToken = ArcGIS.Desktop.Mapping.Events.BeforeSketchCompletedEvent.Subscribe(OnBeforeSketchCompletedEvent);
    }

    private async Task OnBeforeSketchCompletedEvent(BeforeSketchCompletedEventArgs arg)
    {
      //check if surfacename is in the map
      if (arg.MapView.Map.ElevationSurfaces.Count(s => s.Name == surfaceName) == 0)
      {
        MessageBox.Show("Surface: " + surfaceName + " is not in the map");
        return;
      }

      //set the sketch Z values from the specified elevation surface
      var ZResult = await arg.MapView.Map.GetZsFromSurfaceAsync(arg.Sketch,surfaceName);
      if (ZResult.Status == SurfaceZsResultStatus.Ok)
        arg.SetSketchGeometry(ZResult.Geometry);
    }