CODEWITHSUNDEEP
f#
Istvan
Istvan

Reputation: 8562

Is there a way to get Record fields by string in F#?

I would like to get the value of a field in a Record by looking it up with a string.

type Test = { example : string  }
let test = { example = "this is the value" }
let getByName (s:string) =
  ???? //something like test.GetByName(s)

Upvotes: 4

Views: 1650

Answers (1)

3615
3615

Reputation: 3877

Standard .net reflection should be working fine for such scenario. Record fields are exposed as properties, so you can just query the type with reflection API. It could look like this:

  let getByName (s:string) =
    match typeof<Test>.GetProperties() |> Array.tryFind (fun t -> t.Name = s)
      with
      | Some pi -> Some(pi.GetValue(test))
      | None -> None

Upvotes: 7

Related Questions