Question

TcpClient.ConnectAsync is a Task, which doesn’t work readily with F# async workflows.

I think I’m missing something really simple here — is there a general way to use either the Async or Begin/End functions from workflows?

Answer 1

Take a look at Async.AwaitTask and Async.FromBeginEnd.

Generally this will work:

async {
  ...
  do! client.ConnectAsync(address, port) |> Async.AwaitTask
}

However, because the Async module only works directly with Task<'T> and ConnectAsync returns Task, the code required in this particular case is slightly longer:

do! client.ConnectAsync(address, port) |> Async.AwaitIAsyncResult |> Async.Ignore

or

let! _ = client.ConnectAsync(address, port) |> Async.AwaitIAsyncResult