# ConstructorStreamNamespacePredicateProvider Fields

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.streams.constructorstreamnamespacepredicateprovider/)

## Prefix {#prefix-60796a49}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.streams.constructorstreamnamespacepredicateprovider/fields/prefix-60796a49/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Streaming/PubSub/DefaultStreamNamespacePredicateProvider.cs)

```csharp
public const string Prefix
```

The prefix used to identify this predicate provider.