using System;

using System.Collections.Generic;

using System.Threading.Tasks;

using Microsoft.AspNetCore.WebUtilities;

using Newtonsoft.Json;

using Newtonsoft.Json.Serialization;

​

public class Test

{

    public string MyProp { get; set; }

    public bool ShouldSerializeMyProp()

    {

        Console.WriteLine("CALLED !!!");

        return MyProp != "<null>";

    }

}

​

public class Program

{

    public static void Main()

    {

        var contractResolver = new DefaultContractResolver();

        var jsonSettings = new JsonSerializerSettings

            {

                ContractResolver = contractResolver

            };

        Console.WriteLine(contractResolver.IgnoreShouldSerializeMembers);

​

        var test = new Test();

        Console.WriteLine(JsonConvert.SerializeObject(test, jsonSettings));

        test.MyProp = "abs";

        Console.WriteLine(JsonConvert.SerializeObject(test, jsonSettings));

        test.MyProp = "<null>";

        Console.WriteLine(JsonConvert.SerializeObject(test, jsonSettings));

    }

    public static void Main3()

    {

        string city = null;

        string state = null;

            var queryParams = new Dictionary<string, string>

            {

                { "city", city },

                { "state", state },

                { "format", "s" },

            };

            var uri = QueryHelpers.AddQueryString("lbs", queryParams);

        Console.WriteLine(uri);

    }

    public static async Task Main2()

    {

        var tasks = new List<Task>();

        for (int i = 0; i < 1000; i++)

        {

            tasks.Add(Task.Run(() => TestAsync(i)));

        }

        await Task.WhenAll(tasks);

    }

    private static async Task TestAsync(int i)

    {

        await Task.Delay(5000);

        Console.WriteLine(i.ToString());

    }

}