# ReferenceEnvironmentInjectionAnnotation

- Kind: `class`
- Package: [Aspire.Hosting](/reference/api/csharp/aspire.hosting.md)
- Version: `13.4.0`
- Namespace: `Aspire.Hosting.ApplicationModel`
- Target framework: `net8.0`
- Source: [GitHub](https://github.com/microsoft/aspire/blob/a3766e994fd2cba86c8ac60b8a80268cab7e6383/src/Aspire.Hosting/ApplicationModel/ReferenceEnvironmentInjectionAnnotation.cs)
- Implements: [IResourceAnnotation](/reference/api/csharp/aspire.hosting/iresourceannotation.md)

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

## Definition

```csharp
namespace Aspire.Hosting.ApplicationModel;

public sealed class ReferenceEnvironmentInjectionAnnotation
    : Aspire.Hosting.ApplicationModel.IResourceAnnotation
{
    // ...
}
```

## Constructors

- [ReferenceEnvironmentInjectionAnnotation(ReferenceEnvironmentInjectionFlags)](/reference/api/csharp/aspire.hosting/referenceenvironmentinjectionannotation/constructors.md#constructor-referenceenvironmentinjectionflags) -- Initializes a new instance of [ReferenceEnvironmentInjectionAnnotation](/reference/api/csharp/aspire.hosting/referenceenvironmentinjectionannotation.md).

## Properties

- [Flags](/reference/api/csharp/aspire.hosting/referenceenvironmentinjectionannotation/properties.md#flags) : [ReferenceEnvironmentInjectionFlags](/reference/api/csharp/aspire.hosting/referenceenvironmentinjectionflags.md) `get` -- Gets the flags specifying which connection information should be injected.