Fix backwards compatibilyt

src/Spotflow.InMemory.Azure.EventHubs/InMemoryPartitionReceiver.cs

@@ -218,11 +218,13 @@ private async Task<IEnumerable<EventData>> ReceiveBatchCoreAsync(int maximumEven
                 }
                 else
                 {
+#pragma warning disable CS0618 // Type or member is obsolete
                     _lastEnqueuedEventProperties = new(
                         partitionProperties.LastEnqueuedSequenceNumber,
-                        lastOffsetString: partitionProperties.LastEnqueuedOffsetString,
+                        lastOffset: partitionProperties.LastEnqueuedOffset,
                         partitionProperties.LastEnqueuedTime,
                         _timeProvider.GetUtcNow());
+#pragma warning restore CS0618 // Type or member is obsolete
                 }
             }
         }

src/Spotflow.InMemory.Azure.EventHubs/Internals/InMemoryPartition.cs

@@ -72,14 +72,18 @@ public PartitionProperties GetProperties()
 
         var beginningSequenceNumber = currentSegment.Count > 0 ? currentSegment[0].SequenceNumber : lastSequenceNumber;
 
+#pragma warning disable CS0618 // Type or member is obsolete
+
         return EventHubsModelFactory.PartitionProperties(
               eventHubName: name,
               partitionId: PartitionId,
               isEmpty: currentSegment.Count is 0,
               beginningSequenceNumber: beginningSequenceNumber,
               lastSequenceNumber: _lastSequenceNumber,
-              lastOffsetString: _lastOffset.ToString(),
+              lastOffset: _lastOffset,
               lastEnqueuedTime: _lastEnqueuedTime);
+
+#pragma warning restore CS0618 // Type or member is obsolete
     }
 
     public void SendEvent(EventData eventData, string? partitionKey)
@@ -114,15 +118,17 @@ public void SendEvent(EventData eventData, string? partitionKey)
             var eventDataPropertiesCopy = new Dictionary<string, object>(eventData.Properties);
             var eventDataSystemPropertiesCopy = new Dictionary<string, object>(eventData.SystemProperties);
 
+#pragma warning disable CS0618 // Type or member is obsolete
             var eventWithSystemProperties = EventHubsModelFactory.EventData(
                 eventBody: new(eventBodyCopy),
                 properties: eventDataPropertiesCopy,
                 systemProperties: eventDataSystemPropertiesCopy,
                 partitionKey: partitionKey,
                 sequenceNumber: _lastSequenceNumber,
-                offsetString: _lastOffset.ToString(),
+                offset: _lastOffset,
                 enqueuedTime: _lastEnqueuedTime
                );
+#pragma warning restore CS0618 // Type or member is obsolete
 
             eventWithSystemProperties.MessageId = eventData.MessageId;
             eventWithSystemProperties.CorrelationId = eventData.CorrelationId;