Unable to deserialize the JSON result in C#. Input string is not in a correct format error

问题

I am trying to deserialize a json output to a C# object. JSON result:

{"order":{"commission":3.490000,"cost":4.490000,"duration":"day","extended_hours
":false,"fees":0.000000,"class":"equity","price":1.000000,"quantity":1.000000,"r
equest_date":"2013-11-26T09:43:17.118Z","result":true,"side":"buy","status":"ok"
,"symbol":"DIS","type":"limit"}}

My derived class from JSON:

    public class Rootobject
{
    public Order Order { get; set; }
}

public class Order
{
    public float commission { get; set; }
    public float cost { get; set; }
    public string duration { get; set; }
    public bool extended_hours { get; set; }
    public int fees { get; set; }
    public string _class { get; set; }
    public int price { get; set; }
    public int quantity { get; set; }
    public DateTime request_date { get; set; }
    public bool result { get; set; }
    public string side { get; set; }
    public string status { get; set; }
    public string symbol { get; set; }
    public string type { get; set; }
}

Code used to deserialize (JSON.NET from Newtonsoft) :

 Rootobject ord = JsonConvert.DeserializeObject<Rootobject>(responsebody);

I am getting the following error.

 Unhandled Exception: System.FormatException: Input string was not in a correct format.
   at Newtonsoft.Json.Utilities.ConvertUtils.Int32Parse(Char[] chars, Int32 start, Int32 length)
   at Newtonsoft.Json.JsonTextReader.ParseNumber()
   at Newtonsoft.Json.JsonTextReader.ParseValue()
   at Newtonsoft.Json.JsonTextReader.ReadInternal()
   at Newtonsoft.Json.JsonReader.ReadAsInt32Internal()
   at Newtonsoft.Json.JsonTextReader.ReadAsInt32()
   at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.ReadForType(Jso
nReader reader, JsonContract contract, Boolean hasConverter)

I have tried saving the deserialized result to a "dynamic" object which works fine. But I do not want to use the dynamic object for mapping the fields.

Please advice.

Note: Also the 3rd party API is sending a field called "class". How do I call this as I get compile-time error when I try to directly call the field.

回答1:

You have the fees property in the Order class defined as an int but in the JSon text it is 0.00000, i.e. a float or double. I think you may need to make the fees property into a float in order to parse it properly. Looks the same for the price and quantity properties too.

来源：https://stackoverflow.com/questions/20214402/unable-to-deserialize-the-json-result-in-c-input-string-is-not-in-a-correct-fo