NodaZoneDateTimeConverter

NodaZoneDateTimeConverter.cs

using System;
using System.Globalization;
using Newtonsoft.Json;

namespace NodaTime.Serialization.JsonNet
{
    public class NodaZoneDateTimeConverter : JsonConverter
    {
        public NodaZoneDateTimeConverter()
        {
            // default values
            DateTimeFormat = DefaultDateTimeFormat;
            Culture = CultureInfo.InvariantCulture;
        }

        private const string DefaultDateTimeFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ss.FFFFFFF";

        /// <summary>
        /// Gets or sets the date time format used when converting a date to and from JSON.
        /// </summary>
        /// <value>The date time format used when converting a date to and from JSON.</value>
        public string DateTimeFormat { get; set; }

        /// <summary>
        /// Gets or sets the culture used when converting a date to and from JSON.
        /// </summary>
        /// <value>The culture used when converting a date to and from JSON.</value>
        public CultureInfo Culture { get; set; }

        public override bool CanConvert(Type objectType)
        {
            return objectType == typeof(ZonedDateTime) || objectType == typeof(ZonedDateTime?);
        }

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            if (!(value is ZonedDateTime))
                throw new Exception(string.Format("Unexpected value when converting. Expected NodaTime.ZonedDateTime, got {0}.", value.GetType().FullName));

            var zoneDateTime = (ZonedDateTime)value;

            writer.WriteValue(JsonConvert.SerializeObject(new Info(zoneDateTime.LocalDateTime, zoneDateTime.Offset)));
        }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            if (reader.TokenType == JsonToken.Null)
            {
                if (objectType != typeof(ZonedDateTime?))
                    throw new Exception(string.Format("Cannot convert null value to {0}.", objectType));

                return null;
            }

            var info = JsonConvert.DeserializeObject<Info>(reader.Value.ToString());

            return null;
        }

        private class Info
        {
            /// <summary>
            /// Initializes a new instance of the <see cref="Info"/> class.
            /// </summary>
            /// <param name="localDateTime">
            /// The local date time.
            /// </param>
            /// <param name="offset">
            /// The offset.
            /// </param>
            public Info(LocalDateTime localDateTime, Offset offset)
            {
                LocalDateTime = localDateTime;
                Offset = offset;
            }

            /// <summary>
            /// Gets or sets LocalDateTime.
            /// </summary>
            public LocalDateTime LocalDateTime { get; set; }

            /// <summary>
            /// Gets or sets Offset.
            /// </summary>
            public Offset Offset { get; set; }
        }
    }
}