# DefaultStreamIdMapper

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/DefaultStreamIdMapper.cs#L11)

```csharp
public sealed class DefaultStreamIdMapper : IStreamIdMapper
```

The default [IStreamIdMapper](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.streams.istreamidmapper/) implementation.

## Constructors

- [DefaultStreamIdMapper](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.streams.defaultstreamidmapper/constructors/constructor-211b8861/)

## Methods

- [GetGrainKeyId(GrainBindings, StreamId)](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.streams.defaultstreamidmapper/methods/getgrainkeyid-orleans-metadata-grainbindings-orleans-runtime-streamid-a96b82e4/)

## Fields

- [Name](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.streams.defaultstreamidmapper/fields/name-6d04631e/)