public class JsonNetFormatter : MediaTypeFormatter
	{
		private JsonSerializerSettings _jsonSerializerSettings;

		/// <summary>
		/// Initialises a new instance using the default JsonSerializerSettings
		/// </summary>
		public JsonNetFormatter()
			: this(null)
		{
		}

		public JsonNetFormatter(JsonSerializerSettings jsonSerializerSettings)
		{
			_jsonSerializerSettings = jsonSerializerSettings ?? new JsonSerializerSettings();

			// Fill out the mediatype and encoding we support
			SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/json"));
			Encoding = new UTF8Encoding(false, true);
		}

		protected override bool CanReadType(Type type)
		{
			if (type == typeof(IKeyValueModel))
			{
				return false;
			}

			return true;
		}

		protected override bool CanWriteType(Type type)
		{
			return true;
		}

		protected override Task<object> OnReadFromStreamAsync(Type type, Stream stream, HttpContentHeaders contentHeaders, FormatterContext formatterContext)
		{
			// Create a serializer
			var serializer = JsonSerializer.Create(_jsonSerializerSettings);

			// Create task reading the content
			return Task.Factory.StartNew(() =>
			{
				using (var streamReader = new StreamReader(stream, Encoding))
				{
					using (var jsonTextReader = new JsonTextReader(streamReader))
					{
						return serializer.Deserialize(jsonTextReader, type);
					}
				}
			});
		}

		protected override Task OnWriteToStreamAsync(Type type, object value, Stream stream, HttpContentHeaders contentHeaders, FormatterContext formatterContext, System.Net.TransportContext transportContext)
		{
			// Create a serializer
			var serializer = JsonSerializer.Create(_jsonSerializerSettings);

			// Create task writing the serialized content
			return Task.Factory.StartNew(() =>
			{
				using (var jsonTextWriter = new JsonTextWriter(new StreamWriter(stream, Encoding)) { CloseOutput = false })
				{
					serializer.Serialize(jsonTextWriter, value);
					jsonTextWriter.Flush();
				}
			});	
		}
	}