# IStreamIdMapper

Package: [Microsoft.Orleans.Streaming](/orleans/docs/api/csharp/microsoft.orleans.streaming/) 10.0.0

[NuGet package](https://www.nuget.org/packages/Microsoft.Orleans.Streaming) | [Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Streaming/Core/IStreamIdMapper.cs#L9)

```csharp
public interface IStreamIdMapper
```

Common interface for components that map a [StreamId](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.runtime.streamid/) to a [GrainId](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.grainid/)

## Methods

- [GetGrainKeyId(GrainBindings, StreamId)](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.streams.istreamidmapper/methods/getgrainkeyid-orleans-metadata-grainbindings-orleans-runtime-streamid-d1e725e8/)