# ContainerFileSystemCallbackAnnotation Constructors

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

Represents a callback annotation that specifies files and folders that should be created or updated in a container.

## ContainerFileSystemCallbackAnnotation

- Name: `Constructor`

```csharp
public sealed class ContainerFileSystemCallbackAnnotation
{
    public ContainerFileSystemCallbackAnnotation()
    {
        // ...
    }
}
```