# DockerfileBuilderCallbackAnnotation Properties

- Package: [Aspire.Hosting](/reference/api/csharp/aspire.hosting.md)
- Type: [DockerfileBuilderCallbackAnnotation](/reference/api/csharp/aspire.hosting/dockerfilebuildercallbackannotation.md)
- Kind: `Properties`
- Members: `1`

Represents an annotation for providing callbacks to programmatically modify Dockerfile builds.

## Callbacks

- Name: `Callbacks`
- Modifiers: `get`
- Returns: `IReadOnlyList<Func<DockerfileBuilderCallbackContext, Task>>`
- Source: [GitHub](https://github.com/microsoft/aspire/blob/bd20f904cde09ecb9c9ae5116a6f13614bf2d7c2/src/Aspire.Hosting/ApplicationModel/DockerfileBuilderCallbackAnnotation.cs#L36)

Gets the list of callback functions that will be invoked during the Dockerfile build process.

```csharp
public IReadOnlyList<Func<DockerfileBuilderCallbackContext, Task>> Callbacks { get; }
```