# StreamSubscriptionHandleExtensions.ResumeAsync(StreamSubscriptionHandle<T>, Func<T, StreamSequenceToken, Task>, StreamSequenceToken)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.streams.streamsubscriptionhandleextensions/) | [Methods](/orleans/docs/api/csharp/microsoft.orleans.streaming/orleans.streams.streamsubscriptionhandleextensions/methods/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Streaming/Extensions/StreamSubscriptionHandleExtensions.cs)

```csharp
public static Task<StreamSubscriptionHandle<T>> ResumeAsync<T>(this StreamSubscriptionHandle<T> handle, Func<T, StreamSequenceToken, Task> onNextAsync, StreamSequenceToken token = null)
```

Thrown if the supplied stream filter function is not suitable. Usually this is because it is not a static method.

### Parameters

- `handle` (`StreamSubscriptionHandle<T>`): The subscription handle.
- `onNextAsync` (`Func<T, StreamSequenceToken, Task>`): Delegate that is called for IAsyncObserver.OnNextAsync.
- `token` (`StreamSequenceToken`): The stream sequence to be used as an offset to start the subscription from.

### Returns

A promise for a StreamSubscriptionHandle that represents the subscription. The consumer may unsubscribe by using this handle. The subscription remains active for as long as it is not explicitly unsubscribed.