json.net - JObject.Parse modifies end of floating point values

Question

var clientString = "{"max":1214.704958677686}";

JObject o = JObject.Parse(clientString);

var jsonString = o.ToString();

---

contents of jsonString:

{
  "max": 1214.7049586776859
}

this is both in visualizing the object and in doing ToString(). Note that the 686 has mysteriously been expanded to 6859 (precision added). This is a problem for us because the numbers are not exactly the same, and a hash function over the json later does not match.

Answer 1

@Ilija Dimov is correct--JSON.NET parses JSON floats as doubles by default. If you still want to use JObject instead of creating a full blown POCO for deserialization, you can use a JsonTextReader and set the FloatParseHandling option:

var reader = new JsonTextReader(new StringReader(clientString));
reader.FloatParseHandling = FloatParseHandling.Decimal;

JObject obj = JObject.Load(reader);

Console.WriteLine(obj["max"].Value<decimal>()); // 1214.704958677686