serializerf30.fsx

#r "System.Web.Extensions"

let json = """
    { "FirstName":"Foo", 
      "LastName":"Bar",
      "Hobbies":
        [
            {"Sport":"FootBall","Music":"Rock"}
        ]}   """

[<CLIMutable>]
type Hobby = { Sport:string; Music:string }
[<CLIMutable>]
type User = { FirstName:string; LastName:string; 
              Hobbies : System.Collections.ObjectModel.Collection<Hobby> }

let serializer = new System.Web.Script.Serialization.JavaScriptSerializer()
let user = serializer.Deserialize<User>(json)
printfn "%A" user