# ContainerBuildOptionsCallbackAnnotation Constructors

- Package: [Aspire.Hosting](/reference/api/csharp/aspire.hosting.md)
- Type: [ContainerBuildOptionsCallbackAnnotation](/reference/api/csharp/aspire.hosting/containerbuildoptionscallbackannotation.md)
- Kind: `Constructors`
- Members: `2`

Annotation that provides a callback to configure container build options for a resource.

## ContainerBuildOptionsCallbackAnnotation(Func<ContainerBuildOptionsCallbackContext, Task>)

- Name: `Constructor(Func<ContainerBuildOptionsCallbackContext, Task>)`
- Source: [GitHub](https://github.com/microsoft/aspire/blob/bd20f904cde09ecb9c9ae5116a6f13614bf2d7c2/src/Aspire.Hosting/ApplicationModel/ContainerBuildOptionsCallbackAnnotation.cs)

Annotation that provides a callback to configure container build options for a resource.

```csharp
public sealed class ContainerBuildOptionsCallbackAnnotation
{
    public ContainerBuildOptionsCallbackAnnotation(
        Func<ContainerBuildOptionsCallbackContext, Task> callback)
    {
        // ...
    }
}
```

## Parameters

- `callback` (`Func<ContainerBuildOptionsCallbackContext, Task>`)
  The callback function to configure container build options.

## ContainerBuildOptionsCallbackAnnotation(Action<ContainerBuildOptionsCallbackContext>)

- Name: `Constructor(Action<ContainerBuildOptionsCallbackContext>)`
- Source: [GitHub](https://github.com/microsoft/aspire/blob/bd20f904cde09ecb9c9ae5116a6f13614bf2d7c2/src/Aspire.Hosting/ApplicationModel/ContainerBuildOptionsCallbackAnnotation.cs)

Initializes a new instance of [ContainerBuildOptionsCallbackAnnotation](/reference/api/csharp/aspire.hosting/containerbuildoptionscallbackannotation.md) with a synchronous callback.

```csharp
public sealed class ContainerBuildOptionsCallbackAnnotation
{
    public ContainerBuildOptionsCallbackAnnotation(
        Action<ContainerBuildOptionsCallbackContext> callback)
    {
        // ...
    }
}
```

## Parameters

- `callback` (`Action<ContainerBuildOptionsCallbackContext>`)
  The synchronous callback action to configure container build options.