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

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using Autodesk.Revit.DB;
using System;
using System.Collections.Generic;
using System.Linq;

namespace Revit.SDK.Samples.InCanvasControlAPI.CS
{
   /// <summary>
   /// This class manages instances of IssueMarkerTracking on per-document basis. 
   /// </summary>
   public class IssueMarkerTrackingManager
   {
      #region Class implementation

      private IssueMarkerTrackingManager()
      {
      }

      /// <summary>
      /// Gets an instance of IssueMarkerTrackingManager.
      /// </summary>
      /// <returns>An instance of IssueMarkerTrackingManager</returns>
      public static IssueMarkerTrackingManager GetInstance()
      {
         if(manager == null)
         {
            manager = new IssueMarkerTrackingManager();
         }
         return manager;
      }

      /// <summary>
      /// Gets tracking for specified document
      /// </summary>
      /// <param name="doc">A Revit document</param>
      /// <returns>A corresponding instance of IssueMarkerTracking</returns>
      public IssueMarkerTracking GetTracking(Document doc) 
      {
         if (trackings.Where((track) => track.Document.Equals(doc)).FirstOrDefault() is IssueMarkerTracking tracking)
            return tracking;
         return null;
      }

      /// <summary>
      /// Adds IssueMarkerTracking for the given document
      /// </summary>
      /// <param name="doc">A Revit document</param>
      public void AddTracking(Document doc) 
      {
         if(!trackings.Any((track) => track.Document.Equals(doc)))
            trackings.Add(new IssueMarkerTracking(doc));
      }

      /// <summary>
      /// Removes IssueMarkerTracking from this manager
      /// </summary>
      /// <param name="guid">A GUID of the tracking</param>
      public void DeleteTracking(Guid guid) 
      {
         trackings.RemoveWhere((track) => track.Id == guid);
      }

      /// <summary>
      /// Clears all trackings
      /// </summary>
      public void ClearTrackings()
      {
         trackings.Clear();
      }

      #endregion

      #region Class member variables

      private static IssueMarkerTrackingManager manager;

      private HashSet<IssueMarkerTracking> trackings = new HashSet<IssueMarkerTracking>();

      #endregion
   }
}