System.Object
   ArcGIS.Core.CoreObjectsBase
      ArcGIS.Core.Data.Dataset
         ArcGIS.Core.Data.Table
            ArcGIS.Core.Data.FeatureClass
               ArcGIS.Core.Data.Realtime.RealtimeFeatureClass
            ArcGIS.Core.Data.Realtime.RealtimeTable
      ArcGIS.Core.Data.Datastore
         ArcGIS.Core.Data.Realtime.RealtimeDatastore
      ArcGIS.Core.Data.Definition
         ArcGIS.Core.Data.TableDefinition
            ArcGIS.Core.Data.FeatureClassDefinition
               ArcGIS.Core.Data.Realtime.RealtimeFeatureClassDefinition
                  ArcGIS.Core.Data.Realtime.StreamServiceFeatureClassDefinition
            ArcGIS.Core.Data.Realtime.RealtimeTableDefinition
               ArcGIS.Core.Data.Realtime.StreamServiceTableDefinition
      ArcGIS.Core.Data.Realtime.RealtimeCursorBase
         ArcGIS.Core.Data.Knowledge.KnowledgeGraphCursor
         ArcGIS.Core.Data.Realtime.RealtimeCursor
      ArcGIS.Core.Data.Realtime.RealtimeRow
         ArcGIS.Core.Data.Realtime.RealtimeFeature
   ArcGIS.Core.Data.Connector
      ArcGIS.Core.Data.Realtime.RealtimeServiceConnectionProperties

Reference

ArcGIS.Core Assembly