How to return a Task?

Question

I am learning Websocket from: https://radu-matei.com/blog/aspnet-core-websockets-middleware/ How do I return from a Task below?

public override Task ReceiveAsync(WebSocket socket, WebSocketReceiveResult result, byte[] buffer)
    {
        string message = "Replied by: " + cn.GetId(socket);

        Task.Run(async () =>
        {
            await socket.SendAsync(buffer: new ArraySegment<byte>(array: Encoding.ASCII.GetBytes(message),
                                                                 offset: 0,
                                                                 count: message.Length),
                                  messageType: WebSocketMessageType.Text,
                                  endOfMessage: true,
                                  cancellationToken: CancellationToken.None);


        });
    }

I got: Severity Code Description Project File Line Suppression State Error CS0161 'NotificationsMessageHandler.ReceiveAsync(WebSocket, WebSocketReceiveResult, byte[])': not all code paths return a value

and I don't know how to return a Task..

Answer 1

You don't need Task.Run explicitly, Instead of

Task.Run(async () =>
    {
        await socket.SendAsync(buffer: new ArraySegment<byte>(array: Encoding.ASCII.GetBytes(message),
                                                             offset: 0,
                                                             count: message.Length),
                              messageType: WebSocketMessageType.Text,
                              endOfMessage: true,
                              cancellationToken: CancellationToken.None);


    });

you can just use

await socket.SendAsync(buffer: new ArraySegment<byte>(array: Encoding.ASCII.GetBytes(message),
                                                         offset: 0,
                                                         count: message.Length),
                          messageType: WebSocketMessageType.Text,
                          endOfMessage: true,
                          cancellationToken: CancellationToken.None);

here, await will return the result of socket.SendAsync which i am assuming is asynchronous