Why Frame.X static methods from Deedle are generating warnings in VS 2017?

Question

I downloaded the new VS 2017 yesterday and it is working fine, except that I am getting this warning on every line where I call the static method Frame.ReadCsv

Answer 1

It seems you have to use ReadCsv(path="file.csv") instead of ReadCsv(location="file.csv"). The first case provides you with an interface that has option values for optional settings instead of nullables, and addresses the correct overload.

Answer 2

This snippet works OK:

open Deedle
open System.IO

[<EntryPoint>]
let main argv =
    let csv = @"C:\tmp\testDeedle.csv"
    File.Exists csv |> printfn "%A"
    let df = Frame.ReadCsv(csv,hasHeaders=true,inferTypes=true)
    df.GetColumn("Date") |> printfn "%A"
    printfn "%A" argv
    0 // return an integer exit code