# ConstructorStreamNamespacePredicateProvider

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/PubSub/DefaultStreamNamespacePredicateProvider.cs#L36)

```csharp
public class ConstructorStreamNamespacePredicateProvider : IStreamNamespacePredicateProvider
```

Stream namespace predicate provider which supports objects which can be constructed and optionally accept a string as a constructor argument.

## Constructors

- [ConstructorStreamNamespacePredicateProvider](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.streams.constructorstreamnamespacepredicateprovider/constructors/constructor-74138055/)

## Methods

- [FormatPattern(Type, string)](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.streams.constructorstreamnamespacepredicateprovider/methods/formatpattern-system-type-string-8c877491/)
- [TryGetPredicate(string, IStreamNamespacePredicate)](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.streams.constructorstreamnamespacepredicateprovider/methods/trygetpredicate-string-out-orleans-streams-istreamnamespacepredicate-c8372f70/)

## Fields

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