A class for serialising content with a custom JSON serialiser

JsonContent.cs

public class JsonContent : HttpContent
	{
		private static readonly JsonSerializer s_defaultDecisionEngineJsonSerialiser = JsonSerializer.Create(new DecisionEngineJsonSerializerSettings());

		private readonly Lazy<JsonSerializer> _serialiser;

		private readonly object _value;

		public Encoding Encoding { get; }

		public JsonContent(object value)
		{
			_value      = value;
			_serialiser = new Lazy<JsonSerializer>(CreateJsonSerialiser);

			Encoding            = new UTF8Encoding(encoderShouldEmitUTF8Identifier: false);
			Headers.ContentType = new MediaTypeHeaderValue("application/json") { CharSet = Encoding.WebName };
		}

		protected virtual JsonSerializer CreateJsonSerialiser()
		{
			return s_defaultDecisionEngineJsonSerialiser;
		}

		protected override async Task SerializeToStreamAsync(Stream stream, TransportContext context)
		{
			using (var writer = new JsonTextWriter(new StreamWriter(stream, Encoding, bufferSize: 4096, leaveOpen: true)))
			{
				await JObject
					.FromObject(_value, _serialiser.Value)
					.WriteToAsync(writer);
			}
		}

		protected override bool TryComputeLength(out long length)
		{
			length = -1;
			return false;
		}
	}