# DirectorySiloBuilderExtensions.AddGrainDirectory(ISiloBuilder, string, Func<IServiceProvider, string, T>)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.runtime.hosting.directorysilobuilderextensions/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.runtime.hosting.directorysilobuilderextensions/methods/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Runtime/Hosting/DirectorySiloBuilderExtensions.cs#L23-L24)

```csharp
public static ISiloBuilder AddGrainDirectory<T>(this ISiloBuilder builder, string name, Func<IServiceProvider, string, T> implementationFactory)
```

Add a grain directory provider implementation to the silo. If the provider type implements `Orleans.ILifecycleParticipant-1` it will automatically participate to the silo lifecycle.

### Parameters

- `builder` (`ISiloBuilder`): The silo builder.
- `name` (`string`): The name of the grain directory to add.
- `implementationFactory` (`Func<IServiceProvider, string, T>`): Factory to build the grain directory provider.

### Returns

The silo builder.