assets/samples/Samples/InCanvasControlAPI/CS/IssueMarkerSelector.cs

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using Autodesk.Revit.DB;

namespace Revit.SDK.Samples.InCanvasControlAPI.CS
{
   /// <summary>
   /// This class demonstrates marking a marker selected by changing the in-canvas control's image.
   /// </summary>
   public class IssueMarkerSelector
   {
      #region Class implementation

      /// <summary>
      /// Changes selected issue marker in given document's tracking
      /// </summary>
      /// <param name="document">A Revit document</param>
      /// <param name="controlIndex">Id of the clicked In-Canvas control</param>
      public static void SelectMarker(Document document, int controlIndex)
      {
         TemporaryGraphicsManager tempGraphicsManager = TemporaryGraphicsManager.GetTemporaryGraphicsManager(document);
         IssueMarkerTracking issueMarkerTracking = IssueMarkerTrackingManager.GetInstance().GetTracking(document);
         ResourceProvider provider = ResourceProvider.GetInstance();

         // Check if the new selection is valid
         IssueMarker newSelectedMarker = issueMarkerTracking.GetMarkerByIndex(controlIndex);
         if (newSelectedMarker == null)
            return;

         // clear previous selection
         IssueMarker selectedMarker = issueMarkerTracking.GetMarkerByIndex(issueMarkerTracking.GetSelected());
         if (selectedMarker != null)
         {
            selectedMarker.InCanvasControlData.ImagePath = provider.IssueImage;

            // This is how to set updated data to a control
            tempGraphicsManager.UpdateControl(selectedMarker.ControlIndex, selectedMarker.InCanvasControlData);

            issueMarkerTracking.SetSelected(-1);
         }

         if (newSelectedMarker != selectedMarker)
         {
            newSelectedMarker.InCanvasControlData.ImagePath = provider.SelectedIssueImage;

            // This is how to set updated data to a control
            tempGraphicsManager.UpdateControl(newSelectedMarker.ControlIndex, newSelectedMarker.InCanvasControlData);

            issueMarkerTracking.SetSelected(controlIndex);
         }
      }
      
      #endregion
   }
}