ArcGIS Pro sdk 地图自动旋转

internal class RotateTheMap : Button {

  private static double _angle = 0;

  protected override void OnClick() {

   if (LayoutView.Active == null)
    return;

   var layout = LayoutView.Active.Layout;
   var mapFrame = layout.Elements.OfType<MapFrame>().FirstOrDefault();
   if (mapFrame == null)
    return;

   QueuedTask.Run(() => {

    var def = mapFrame.GetDefinition() as CIMMapFrame;
    if (def.View.ViewingMode != MapViewingMode.Map)
     return; //2D only

    _angle -= 15;//Counter-clockwise
    if (_angle < -345) _angle = 0;

    var autoCamera = def.AutoCamera;
    if (autoCamera == null)
    {
     //unusual
     def.AutoCamera = new CIMAutoCamera()
     {
      Camera = new CIMViewCamera(),
      AutoCameraType = AutoCameraType.Extent
     };
    }
    else if (autoCamera.Source != AutoCameraSource.None &&
        autoCamera.Source != AutoCameraSource.Fixed)
    {
     return;
    }

    def.View.Camera.Heading = _angle;
    mapFrame.SetDefinition(def);
   });
  }
 }