# ImplicitStreamSubscriptionAttribute.StreamIdMapper

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.implicitstreamsubscriptionattribute/) | [Properties](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.implicitstreamsubscriptionattribute/properties/)

[Source](https://github.com/dotnet/orleans/blob/b7a9e3e1c9c54b3cec3a467c5734bf7744541bcf/src/Orleans.Streaming/Predicates/StreamSubscriptionAttributes.cs)

```csharp
public string? StreamIdMapper
```

Gets the name of the stream identifier mapper.

### Value

The name of the stream identifier mapper.