# ConstructorChannelNamespacePredicateProvider.Prefix

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.broadcastchannel/orleans.broadcastchannel.constructorchannelnamespacepredicateprovider/) | [Fields](/orleans/docs/api/csharp/microsoft.orleans.broadcastchannel/orleans.broadcastchannel.constructorchannelnamespacepredicateprovider/fields/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.BroadcastChannel/SubscriberTable/Predicates/DefaultStreamNamespacePredicateProvider.cs)

```csharp
public const string Prefix
```

The prefix used to identify this predicate provider.