# DockerfileStage Constructors

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

Represents a stage within a multi-stage Dockerfile.

## DockerfileStage(string?, string)

- Name: `Constructor(string?, string)`
- Source: [GitHub](https://github.com/microsoft/aspire/blob/bd20f904cde09ecb9c9ae5116a6f13614bf2d7c2/src/Aspire.Hosting/ApplicationModel/Docker/DockerfileStage.cs#L15-L28)

Initializes a new instance of the [DockerfileStage](/reference/api/csharp/aspire.hosting/dockerfilestage.md) class.

```csharp
public class DockerfileStage
{
    public DockerfileStage(
        string? stageName,
        string imageReference)
    {
        // ...
    }
}
```

## Parameters

- `stageName` (`string?`)
  The optional stage name.
- `imageReference` (`string`)
  The base image reference.