JSON serialized output has C# escaped formatting

Question

I am trying to POST an updated object to REST server API from my client. I am using RestSharp and I am adding JSON representation of my object to the body of my request. However, my string representation of the serialized object has wrong format. The server rejects it.

My request looks something like this (I used Fiddler to get it)

PUT https://myapp.net/api/PriceListItems/151276 HTTP/1.1
Accept: application/json, application/xml, text/json, text/x-json, text/javascript, text/xml
User-Agent: RestSharp/104.4.0.0
Content-Type: application/json
Host: myapp.net
Content-Length: 75
Accept-Encoding: gzip, deflate

"{\"Id\":151276,\"AgendaId\":0,\"CurrencyId\":1,\"Code\":\"\",\"Price\":7.0}"

I have tried to serialize my object with Json.NET, RestSharp's internal Json serializer and with JavaScriptSerializer from System.Web.Script.Serialization. All return a string in such format. I know that the reason for such formatting is because C# escapes double quotes so it can display it properly inside, but i dont understand how am I supposed to pass it to my request without this escaped formatting. I know for a fact that properly formed JSON is accepted by the server.

The object that I am trying to serialize looks like this

public class PriceListItem
    {
        public static PriceListItem CreatePriceListItem(int id, int agendaId, int currencyId, string code, string unit, decimal price)
        {
            var priceListItem = new PriceListItem
            {
                Id = id,
                AgendaId = agendaId,
                CurrencyId = currencyId,
                Code = code,
                Price = price
            };
            return priceListItem;
        }

        public int Id { get; set; }

        public int AgendaId { get; set; }

        public int CurrencyId { get; set; }

        public string Code { get; set; }

        public decimal Price { get; set; }

EDIT: Moved my solution from here to answers.

Answer 1

I just read another topic on this problem here. The problem was that I serializing the object twice.

Instead of

request.AddBody(JsonConvert.SerializeObject(priceListItem));

I should have used

request.AddBody(priceListItem);

Anyway, maybe it will help someone else. I find it strange however that the object is serialized automatically.