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

namespace Wood.Util
{
    public class NullableLongToStringJsonConverter : JsonConverter<long?>
    {
        /// <summary>
        /// 反序列化
        /// </summary>
        /// <param name="reader"></param>
        /// <param name="objectType"></param>
        /// <param name="existingValue"></param>
        /// <param name="hasExistingValue"></param>
        /// <param name="serializer"></param>
        /// <returns></returns>
        public override long? ReadJson(JsonReader reader, Type objectType, long? existingValue, bool hasExistingValue, JsonSerializer serializer)
        {
            var jt = JValue.ReadFrom(reader);
            if (jt.IsEmpty())
                return null;
            return jt.Value<long?>();
        }

        /// <summary>
        /// 序列化
        /// </summary>
        /// <param name="writer"></param>
        /// <param name="value"></param>
        /// <param name="serializer"></param>
        public override void WriteJson(JsonWriter writer, long? value, JsonSerializer serializer)
        {
            if(value==0)
				serializer.Serialize(writer, null);
            else
			    serializer.Serialize(writer, value?.ToString());
        }
    }
}