# ImplicitChannelSubscriptionAttribute Properties

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.broadcastchannel/orleans.implicitchannelsubscriptionattribute/)

## ChannelIdMapper {#channelidmapper-5a693deb}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.broadcastchannel/orleans.implicitchannelsubscriptionattribute/properties/channelidmapper-5a693deb/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.BroadcastChannel/SubscriberTable/Predicates/ImplicitChannelSubscriptionAttribute.cs#L26)

```csharp
public string ChannelIdMapper
```

Gets the name of the channel identifier mapper.

### Value

The name of the channel identifier mapper.

## Predicate {#predicate-ceb8354c}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.broadcastchannel/orleans.implicitchannelsubscriptionattribute/properties/predicate-ceb8354c/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.BroadcastChannel/SubscriberTable/Predicates/ImplicitChannelSubscriptionAttribute.cs#L20)

```csharp
public IChannelNamespacePredicate Predicate
```

Gets the stream namespace filter predicate.