using System;

using Newtonsoft.Json;

​

public class Program

{

    public static void Main()

    {

        Test1();

        Test2();

        Test3();

        Test4();

        Test5();

    }

    public static void ShowValues(TestClass test){

        Console.WriteLine("Id1: " + test.Id1);

        Console.WriteLine("Id2: " + test.Id2);

        Console.WriteLine("Id3: " + test.Id3);

        Console.WriteLine("Date1: " + test.Date1);

        Console.WriteLine("Date2: " + test.Date2);

    }

    public static void Test1() {

        string data = @"{

        ""id1"":1,

        ""id2"":2,

        ""id3"":3,

        ""date2"": ""1997-07-16T19:20:00+01:00"",

        }";

        Console.WriteLine("======================================");

        Console.WriteLine("= Test1");

        Console.WriteLine("--------------------------------------");

        try

        {

            ShowValues(JsonConvert.DeserializeObject<TestClass>(data));

        } 

        catch(Exception ex){

            Console.WriteLine(ex.Message);

        }

        Console.WriteLine("======================================");

    }

    public static void Test2() {

        string data = @"{

        ""id1"":1,

        ""id2"":2,

        ""id3"":3,

        ""date1"": null,

        ""date2"": ""1997-07-16T19:20:00+01:00"",

        }";

        Console.WriteLine("======================================");

        Console.WriteLine("= Test2");

        Console.WriteLine("--------------------------------------");

        try

        {

            ShowValues(JsonConvert.DeserializeObject<TestClass>(data));

        } 

        catch(Exception ex){

            Console.WriteLine(ex.Message);

        }

        Console.WriteLine("======================================");

    }

    public static void Test3() {

        string data = @"{

        ""id1"":1,

        ""id2"":2,

        ""id3"":3,

        ""date1"": ""1997-07-16T19:20:00+01:00"",

        ""date2"": ""1997-07-16T19:20:00+01:00"",

        }";

        Console.WriteLine("======================================");

        Console.WriteLine("= Test3");

        Console.WriteLine("--------------------------------------");

        try

        {

            ShowValues(JsonConvert.DeserializeObject<TestClass>(data));

        } 

        catch(Exception ex){

            Console.WriteLine(ex.Message);

        }

        Console.WriteLine("======================================");

    }

    public static void Test4() {

        string data = @"{

        ""id1"":1,

        ""id2"":2,

        ""id3"":3,

        ""date1"": ""1997-07-16T19:20:00+01:00"",

        }";

        Console.WriteLine("======================================");

        Console.WriteLine("= Test4");

        Console.WriteLine("--------------------------------------");

        try

        {

            ShowValues(JsonConvert.DeserializeObject<TestClass>(data));

        } 

        catch(Exception ex){

            Console.WriteLine(ex.Message);

        }

        Console.WriteLine("======================================");

    }

    public static void Test5() {

        string data = @"{

        ""id1"":1,

        ""id2"":2,

        ""id3"":3,

        ""date1"": ""1997-07-16T19:20:00+01:00"",

        ""date2"": null

        }";

        Console.WriteLine("======================================");

        Console.WriteLine("= Test5");

        Console.WriteLine("--------------------------------------");

        try

        {

            ShowValues(JsonConvert.DeserializeObject<TestClass>(data));

        } 

        catch(Exception ex){

            Console.WriteLine(ex.Message);

        }

        Console.WriteLine("======================================");

    }

}

​

public class TestClass

{

    public TestClass()

    {

        this.Id1 = 0;

        this.Id2 = 0;

        this.Id3 = 0;

        this.Date1 = DateTime.Now.ToUniversalTime();

        this.Date2 = DateTime.Now.ToUniversalTime();

    }

​

    [JsonProperty("id1")]

    public int Id1 { get; set; }

​

    [JsonProperty("id2")]

    public int Id2 { get; set; }

​

    [JsonProperty("id3")]

    public int Id3 { get; set; }

​

    [JsonProperty("date1")]

    public DateTime Date1 { get; set; }

    [JsonProperty(PropertyName = "date2", Required = Required.Always, NullValueHandling = NullValueHandling.Ignore)]

    public DateTime Date2 { get; set; }

}