Ex, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using Newtonsoft.Json;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            List<UserDataJson> test = new List<UserDataJson>()
            {
                new UserDataJson("abc")
            };
            string json = SaveData(test);
            Console.WriteLine(json);
            Console.WriteLine();
            
            List<UserDataJson> result = JsonConvert.DeserializeObject<List<UserDataJson>>(json);
            Console.WriteLine(result.Count);
            Console.WriteLine(result.Single().Location);
            Console.WriteLine(result.Single().Opacity);
        }
        
        public static string SaveData(IReadOnlyCollection<UserDataJson> userData)
        {
             return JsonConvert.SerializeObject(userData, Formatting.Indented);
        }
    }
    
    public class UserDataJson
    {
        public UserDataJson() { }

public UserDataJson(string path)
        {
            Location = path;
            Opacity = 1;
        }

public string Location { get; set; }

public double Opacity { get; set; }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,22 sec, absolute running time: 0,47 sec, cpu time: 0,47 sec, average memory usage: 27 Mb, average nr of threads: 5, absolute service time: 0,71 sec