using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using Newtonsoft.Json; using System.IO; namespace Study13 { class App { //생성자 public App() { string json = File.ReadAllText("./item_price.json"); ItemPrice[] itemPrices = JsonConvert.DeserializeObject(json); foreach(ItemPrice price in itemPrices) { Console.WriteLine("{0} {1} {2}", ..