# UniqueKey.PrimaryKeyToGuid(string?)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.uniquekey/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.uniquekey/methods/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core.Abstractions/IDs/Legacy/UniqueKey.cs#L181-L182)

```csharp
public Guid PrimaryKeyToGuid(out string? extendedKey)
```

### Parameters

- `extendedKey` (`string?`)