F# Parallelism: Map=>Parallel=>StartAsTask

Key ---- function called in Map must have async { }

namespace JQD

type Downloader() =

    let Download n=
      async {
        let f=System.IO.File.ReadLines("")
        return f
      }

    member this.DA()=
        [|1.100|]
        |> Seq.map(fun n->Download n)
        |> Async.Parallel 
        |> Async.StartAsTask