using System;

using System.Text.RegularExpressions;

using System.Web;

using Newtonsoft.Json; 

using Newtonsoft.Json.Serialization;

​

public class UserInformationRequest

{

    public string TimeStamp;

    [JsonProperty(Required = Required.Always)]

    public UserInformation User;

}

​

public class UserInformation

{

    public string ID;

    [JsonProperty(Required = Required.Always)]

    public string LoginName;

}

​

public static class Tester

{

    public static UserInformationRequest GetUserInformationRequestFromString(string userInformation)

    {

        try

        {

            return JsonConvert.DeserializeObject<UserInformationRequest>(userInformation);

        }

        catch (Exception ex)

        {

            //exception thrown when userInformation.TimeStamp is null, as expected

            Console.WriteLine(ex.Message);

            return null;

        }

    }

}

​

public class Program

{

    public static void Main()

    {

        //var sa = "{\"Errors\":[\"This is an error\"]}";

        var s = "{\"TimeStamp\":\"This is an error\",\"User\":{}";

        Console.WriteLine("deserializing with base object containing null...");

        Tester.GetUserInformationRequestFromString(s);

        Console.WriteLine("deserializing completes without error.");

    }

}