# ConstructorChannelNamespacePredicateProvider Methods

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

## FormatPattern(Type, string) {#formatpattern-system-type-string-1cecd748}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.broadcastchannel/orleans.broadcastchannel.constructorchannelnamespacepredicateprovider/methods/formatpattern-system-type-string-1cecd748/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.BroadcastChannel/SubscriberTable/Predicates/DefaultStreamNamespacePredicateProvider.cs#L48-L53)

```csharp
public static string FormatPattern(Type predicateType, string constructorArgument)
```

Formats a stream namespace predicate which indicates a concrete [IChannelNamespacePredicate](/orleans/docs/api/csharp/microsoft.orleans.broadcastchannel/orleans.broadcastchannel.ichannelnamespacepredicate/) type to be constructed, along with an optional argument.

### Parameters

- `predicateType` (`Type`)
- `constructorArgument` (`string`)

## TryGetPredicate(string, IChannelNamespacePredicate) {#trygetpredicate-string-out-orleans-broadcastchannel-ichannelnamespacepredicate-767341b0}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.broadcastchannel/orleans.broadcastchannel.constructorchannelnamespacepredicateprovider/methods/trygetpredicate-string-out-orleans-broadcastchannel-ichannelnamespacepredicate-767341b0/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.BroadcastChannel/SubscriberTable/Predicates/DefaultStreamNamespacePredicateProvider.cs#L59-L96)

```csharp
public bool TryGetPredicate(string predicatePattern, out IChannelNamespacePredicate predicate)
```

Get the predicate matching the provided pattern. Returns `false` if this provider cannot match the predicate.

### Parameters

- `predicatePattern` (`string`)
- `predicate` (`IChannelNamespacePredicate`)