using System;

using System.Collections.Generic;

using System.Threading.Tasks;

using Microsoft.CodeAnalysis.CSharp.Scripting;

using Microsoft.CodeAnalysis.Scripting;

using Newtonsoft.Json.Serialization;

using Newtonsoft.Json;

​

    class Program

    {

        const string Code = @"return new {

    Name = Data.Value(""Name""),

    Price = Data.Value(""Price""),

    Code = Data.Value(""ProductCode""),

    Description = Data.Value(""ProductDesc"")

};

​

static object Value(this IReadOnlyDictionary<string, object> dictionary, string key)

{

    return (dictionary.ContainsKey(key)) ? dictionary[key] : null;

}";

        static async Task Main(string[] args)

        {

            // todo: Code would come from some external source.

            var data = await GenerateAsync(Code, new GlobalData(new Dictionary<string, object>

                {

                    { "Name", "2L Milk" },

                    { "Price", 3.75m },

                    { "ProductCode", "PAULS-FC-2L" },

                    { "ProductDesc", "Pauls 2 Litre Bottle Full-Cream Milk" }

                }));

            Console.WriteLine(JsonUtils.Stringify(data));

        }

​

        public static async Task<object> GenerateAsync(string codeAsString, GlobalData data)

        {

            var options = ScriptOptions.Default

                .AddReferences("System", "System.Collections.Generic")

                .AddImports("System", "System.Collections.Generic");

​

            var script = CSharpScript.Create(codeAsString, options: options, globalsType: typeof(GlobalData));

​

            var state = await script.RunAsync(data);

​

            return (state.Exception == null) ? state.ReturnValue : throw new Exception("Runtime code had issues.", state.Exception);

        }

    }

    static class JsonUtils

    {

        private static JsonSerializerSettings JsonSettings => new JsonSerializerSettings()

        {

            ContractResolver = new DefaultContractResolver() { NamingStrategy = new SnakeCaseNamingStrategy() },

        };

​

        internal static string Stringify(object data)

        {

            return JsonConvert.SerializeObject(data, JsonSettings);

        }

​

    }

​

    public class GlobalData

    {

        public GlobalData(IReadOnlyDictionary<string, object> data)

        {

            Data = data;

        }

        public IReadOnlyDictionary<string, object> Data { get; }

    }