using System;

using System.Collections.Generic;

​

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        JL logger = new JL();

        logger.Info("Hello!");

        string s = "foo";

        int i = 100;

        int[] n = { 1, 2, 3, 4 };

        logger.WithFields(new Dictionary<string, object>

            {

                {"s", s},

                {"i", i},

                {"n", n}

            }

        ).Info("Hello with friends!");

    }

}

​

public class JL

{

    private Dictionary<string, object> fields;

    public JL WithFields(Dictionary<string, object> addedFields)

    {

        JL newLogger = new JL(fields);

        foreach(KeyValuePair<string, object> entry in addedFields)

        {

            newLogger.fields.Add(entry.Key, entry.Value);

        }

        return newLogger;

    }

    public void Info(string message)

    {

        Dictionary<string, object> printFields = new Dictionary<string, object>(fields);

        printFields.Add("severity", 200);

        printFields.Add("timestamp", DateTime.UtcNow);

        printFields.Add("log", message);

        Console.WriteLine(JsonConvert.SerializeObject(printFields));    

    }

    public JL()

    {

        fields = new Dictionary<string, object>();

    }

    private JL(Dictionary<string, object> fieldsToCopy)

    {

        fields = new Dictionary<string, object>(fieldsToCopy);

    }

}