Convert long number as string in the serialization

Question

I have a custom made class that use a long as ID. However, when I call my action using ajax, my ID is truncated and it loses the last 2 numbers because javascript loses prec

Answer 1

You could probably create a custom JsonConverter and apply it on your property.

Following is an example (NOTE: I haven't used this api before so it could probably be improved more, but following should give you a rough idea):

public class Person
{
    [JsonConverter(typeof(IdToStringConverter))]
    public long ID { get; set; }

    public string Name { get; set; }
}

public class IdToStringConverter : JsonConverter
{
    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        JToken jt = JValue.ReadFrom(reader);

        return jt.Value();
    }

    public override bool CanConvert(Type objectType)
    {
        return typeof(System.Int64).Equals(objectType);
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        serializer.Serialize(writer, value.ToString());
    }
}

Web API Action:

public Person Post([FromBody]Person person)
{
    return person;
}

Request:

POST http://asdfasdf/api/values HTTP/1.1  
Host: servername:9095  
Connection: Keep-Alive  
Content-Type: application/json  
Content-Length: 42  

{"ID":"1306270928525862400","Name":"Mike"}

Response:

HTTP/1.1 200 OK  
Content-Length: 42  
Content-Type: application/json; charset=utf-8  
Server: Microsoft-HTTPAPI/2.0  
Date: Fri, 28 Jun 2013 17:02:18 GMT  

{"ID":"1306270928525862400","Name":"Mike"}

EDIT:
if you do not want to decorate the property with an attribute, you could instead add it to the Converters collection. Example:

config.Formatters.JsonFormatter.SerializerSettings.Converters.Add(new IdToStringConverter());