gistfile1.cs

using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication37
{
    class Program
    {
        static void Main(string[] args)
        {
            var taskRouting = new TaskRouting()
            {
                Filters = new List<Filter>
                {
                    new Filter() { 
                        FriendlyName="Gold Tickets", 
                        Expression="customer_value == 'Gold' AND type == 'ticket'",
                        Targets = new List<Target> {
                            new Target() { 
                                Queue = "WQ0123456789abcdef0123456789abcdef",
                                Priority = "2"
                            }
                        }
                    },
                    new Filter() { 
                        FriendlyName="Silver and Bronze Tickets", 
                        Expression="customer_value IN ['Silver', 'Bronze'] AND type == 'ticket'",
                        Targets = new List<Target> {
                            new Target() { 
                                Queue = "WQabcdef0123456789abcdef0123456789",
                                Priority = "1",
                                Timeout="300"
                            },
                            new Target() {
                                Queue="WQabcdef01234567890123456789abcdef"
                            }
                        }
                    },
                    new Filter() { 
                        FriendlyName="Leads", 
                        Expression="type == 'lead'",
                        Targets = new List<Target> {
                            new Target() { 
                                Queue = "WQabcdef01234567890123456789abcdef",
                                Priority = "3"
                            }
                        }
                    }
                },
                DefaultFilter = new DefaultFilter() { Queue = "WQabcdef01234567890123456789abcdef" }
            };

            var result = Newtonsoft.Json.JsonConvert.SerializeObject(taskRouting, Newtonsoft.Json.Formatting.Indented, new JsonSerializerSettings() { NullValueHandling = NullValueHandling.Ignore, ContractResolver=new CamelCasePropertyNamesContractResolver() });

            Console.WriteLine(result);
            Console.Read();
        }
    }

    public class TaskRouting
    {
        public TaskRouting()
        {
            this.Filters = new List<Filter>();
        }

        public IEnumerable<Filter> Filters { get; set; }

        [JsonProperty(PropertyName="default_filter")]
        public DefaultFilter DefaultFilter { get; set; }
    }

    public class Filter
    {
        public Filter()
        {
            this.Targets = new List<Target>();
        }

        [JsonProperty(PropertyName = "friendly_name")]
        public string FriendlyName { get; set; }
        public string Expression { get; set; }
        public IEnumerable<Target> Targets { get; set; }

    }

    public class Target
    {
        public string Queue { get; set; }
        public string Priority { get; set; }
        public string Timeout { get; set; }

        public string Expression { get; set; }
    }

    public class DefaultFilter
    {
        public string Queue { get; set; }
    }
}