using System;

using Newtonsoft.Json;

using System.Runtime.Serialization;

public class Program

{

    public static void Main()

    {

        CallContext callContext = new CallContext { ExternalProcessingTimeMs = 10 };

        string rawContext = JsonConvert.SerializeObject(callContext);

        CallContext clone = JsonConvert.DeserializeObject<CallContext>(rawContext);

        Console.WriteLine(clone.ExternalProcessingTimeMs);

    }

}

​

public class CallContext

{

    public CallContext()

    {

        ExternalProcessingTimeMs = 5;

    }

    public int ExternalProcessingTimeMs { get; set; }

​

    [OnDeserialized]

    void OnDeserialized(StreamingContext context)

    {

        ExternalProcessingTimeMs = 0;

    }

}