# ResourceUrlsCallbackAnnotation

- Kind: `class`
- Package: [Aspire.Hosting](/reference/api/csharp/aspire.hosting.md)
- Version: `13.3.0`
- Namespace: `Aspire.Hosting.ApplicationModel`
- Target framework: `net8.0`
- Source: [GitHub](https://github.com/microsoft/aspire/blob/bd20f904cde09ecb9c9ae5116a6f13614bf2d7c2/src/Aspire.Hosting/ApplicationModel/ResourceUrlsCallbackAnnotation.cs)
- Implements: [IResourceAnnotation](/reference/api/csharp/aspire.hosting/iresourceannotation.md)

Represents an annotation that provides a callback to modify URLs that should be displayed for the resource.

## Definition

```csharp
namespace Aspire.Hosting.ApplicationModel;

public sealed class ResourceUrlsCallbackAnnotation
    : Aspire.Hosting.ApplicationModel.IResourceAnnotation
{
    // ...
}
```

## Constructors

- [ResourceUrlsCallbackAnnotation(Action<ResourceUrlsCallbackContext>)](/reference/api/csharp/aspire.hosting/resourceurlscallbackannotation/constructors.md#constructor-action-resourceurlscallbackcontext) -- Initializes a new instance of the [ResourceUrlsCallbackAnnotation](/reference/api/csharp/aspire.hosting/resourceurlscallbackannotation.md) class with the specified callback.
- [ResourceUrlsCallbackAnnotation(Func<ResourceUrlsCallbackContext, Task>)](/reference/api/csharp/aspire.hosting/resourceurlscallbackannotation/constructors.md#constructor-func-resourceurlscallbackcontext-task) -- Initializes a new instance of the [ResourceUrlsCallbackContext](/reference/api/csharp/aspire.hosting/resourceurlscallbackcontext.md) class with the specified callback.

## Properties

- [Callback](/reference/api/csharp/aspire.hosting/resourceurlscallbackannotation/properties.md#callback) : `Func<ResourceUrlsCallbackContext, Task>` `get` -- Gets or sets the callback action to be executed when the URLs are being processed.