using System;

using Newtonsoft.Json;

public class Program

{

    public static void Main(string[] args)

    {

        try

        {

            string jsonWithExtraProperty = @"

            {

                ""Bar"": ""Baz"",

                ""ExtraProperty"": ""Quux""

            }";

            JsonSerializerSettings settings = new JsonSerializerSettings();

            settings.MissingMemberHandling = MissingMemberHandling.Error;   // comment out this line to get the default behavior

            var obj = JsonConvert.DeserializeObject<Foo>(jsonWithExtraProperty, settings);

            Console.WriteLine(obj.Bar);

        }

        catch (Exception ex)

        {

            Console.WriteLine(ex.GetType().Name + ": " + ex.Message);

        }

    }

}

​

public class Foo

{

    public string Bar { get; set; }

}

​