# ReferenceEnvironmentInjectionAnnotation Constructors

- Package: [Aspire.Hosting](/reference/api/csharp/aspire.hosting.md)
- Type: [ReferenceEnvironmentInjectionAnnotation](/reference/api/csharp/aspire.hosting/referenceenvironmentinjectionannotation.md)
- Kind: `Constructors`
- Members: `1`

Annotation that specifies which connection and endpoint information should be injected into environment variables when a resource is referenced using `WithReference()`.

## ReferenceEnvironmentInjectionAnnotation(ReferenceEnvironmentInjectionFlags)

- Name: `Constructor(ReferenceEnvironmentInjectionFlags)`
- Source: [GitHub](https://github.com/microsoft/aspire/blob/bd20f904cde09ecb9c9ae5116a6f13614bf2d7c2/src/Aspire.Hosting/ApplicationModel/ReferenceEnvironmentInjectionAnnotation.cs#L16-L19)

Initializes a new instance of [ReferenceEnvironmentInjectionAnnotation](/reference/api/csharp/aspire.hosting/referenceenvironmentinjectionannotation.md).

```csharp
public sealed class ReferenceEnvironmentInjectionAnnotation
{
    public ReferenceEnvironmentInjectionAnnotation(
        ReferenceEnvironmentInjectionFlags flags)
    {
        // ...
    }
}
```

## Parameters

- `flags` ([ReferenceEnvironmentInjectionFlags](/reference/api/csharp/aspire.hosting/referenceenvironmentinjectionflags.md))
  The flags specifying which connection information to inject.