# EventHubDataAdapter.GetOffset(CachedMessage)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.streaming.eventhubs/orleans.streaming.eventhubs.eventhubdataadapter/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.streaming.eventhubs/orleans.streaming.eventhubs.eventhubdataadapter/methods/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Azure/Orleans.Streaming.EventHubs/Providers/Streams/EventHub/EventHubDataAdapter.cs#L89-L90)

```csharp
public virtual string GetOffset(CachedMessage lastItemPurged)
```

Get offset from cached message. Left to derived class, as only it knows how to get this from the cached message.

### Parameters

- `lastItemPurged` (`CachedMessage`)