WebSocket in Background transfer and NSURLSession in Xamarin.iOS

Question

I am looking into creating a Xamarin.iOS app that can connect to a WebSocket server when the app is backgrounded or suspended. The app is expected to close the channel once it receives a certain 'close' message from the server.

As per Apple's documentation, NSUrlSession allows to create a WebSocket task for the provided URL.

Xamarin has a short guide about using NSUrlSession, but the API reference documentation does not have any WebSocket-related methods.

A search engine search for 'xamarin nsurlsession webSocketTaskWithURL' returns zero results.

Is it possible to use WebSocket in NSUrlSession in Xamarin.iOS?

Answer 1

Hello,
Welcome to our Microsoft Q&A platform!

If you want to use WebSocket in Xamarin.iOS, declare a namespace（using Foundation） to access NSUrlSessionWebSocketTask，then use C# to implement it. The following code shows a sample:

NSUrlSession session = NSUrlSession.SharedSession;  
NSUrlSessionWebSocketTask task = session.CreateWebSocketTask(new NSUrl(""));  

Best Regards,
Wenyan Zhang

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