# DockerfileBuilderCallbackContext Constructors

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

Provides context information for Dockerfile build callbacks.

## DockerfileBuilderCallbackContext(IResource, DockerfileBuilder, IServiceProvider, CancellationToken)

- Name: `Constructor(IResource, DockerfileBuilder, IServiceProvider, CancellationToken)`
- Source: [GitHub](https://github.com/microsoft/aspire/blob/bd20f904cde09ecb9c9ae5116a6f13614bf2d7c2/src/Aspire.Hosting/ApplicationModel/DockerfileBuilderCallbackContext.cs#L23-L29)

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

```csharp
public class DockerfileBuilderCallbackContext
{
    public DockerfileBuilderCallbackContext(
        IResource resource,
        DockerfileBuilder builder,
        IServiceProvider services,
        CancellationToken cancellationToken)
    {
        // ...
    }
}
```

## Parameters

- `resource` ([IResource](/reference/api/csharp/aspire.hosting/iresource.md))
  The resource being built.
- `builder` ([DockerfileBuilder](/reference/api/csharp/aspire.hosting/dockerfilebuilder.md))
  The Dockerfile builder instance.
- `services` (`IServiceProvider`)
  The service provider for dependency injection.
- `cancellationToken` (`CancellationToken`)
  The cancellation token to observe while waiting for the task to complete.