# ManifestPublishingCallbackAnnotation Properties

- Package: [Aspire.Hosting](/reference/api/csharp/aspire.hosting.md)
- Type: [ManifestPublishingCallbackAnnotation](/reference/api/csharp/aspire.hosting/manifestpublishingcallbackannotation.md)
- Kind: `Properties`
- Members: `2`

Represents an annotation that provides a callback to be executed during manifest publishing.

## Callback

- Name: `Callback`
- Modifiers: `nullable` `get`
- Returns: `Func<ManifestPublishingContext, Task>`
- Source: [GitHub](https://github.com/microsoft/aspire/blob/bd20f904cde09ecb9c9ae5116a6f13614bf2d7c2/src/Aspire.Hosting/ApplicationModel/ManifestPublishingCallbackAnnotation.cs#L41)

Gets the callback action for publishing the manifest.

```csharp
public Func<ManifestPublishingContext, Task>? Callback { get; }
```

## Ignore

- Name: `Ignore`
- Modifiers: `static` `get`
- Returns: [ManifestPublishingCallbackAnnotation](/reference/api/csharp/aspire.hosting/manifestpublishingcallbackannotation.md)
- Source: [GitHub](https://github.com/microsoft/aspire/blob/bd20f904cde09ecb9c9ae5116a6f13614bf2d7c2/src/Aspire.Hosting/ApplicationModel/ManifestPublishingCallbackAnnotation.cs#L47)

Represents a `null` -based callback annotation for manifest publishing used in scenarios where it's ignored.

```csharp
public static ManifestPublishingCallbackAnnotation Ignore { get; }
```