change or disable default json serialization on an asp.net webform

Question

how to prevent default serialization in a aspnet webform web method (not api or mvc) in order to user Json.net

using Newtonsoft.Json.Linq;
using Newtonsoft.Json;

[WebMethod]
public static object MyMethod()
{
     dynamic field1 = new JObject();
     field1.Alessio = "ciao"; 

     return JsonConvert.SerializeObject(field1);        
}

the output is:

{"d":"{\"Alessio\":\"ciao\"}"}

instead it should be

{"d":"{ "Alessio ": "ciao"}"}

because the serialization has been applied twice (from JsonConvert.SerializeObject and from the default serializer)

is there a way to: - disable the default serialization for a single webmethod? or - change the default serializer with Json.Net serializar only on a page or on a method? or - change the default serializer with Json.Net globally?

The project is a webform application (not an api or a mvc application) and is not intended to move WebMethods on a WCF or on a HttpHandler

Your desired output is not valid JSON. Did you mean {"d": { "Alessio": "ciao" } } instead? — Brian Rogers
– Brian Rogers, Commented Oct 17, 2016 at 15:10

Stephen Kennedy · Accepted Answer · 2018-02-21 14:01:27Z

4

I made the webmethod "void" (in order to prevent automatic serialization) and set the correct http headers by hand/manually craft the Response:

[WebMethod]
public static void MyMethod()
{
    .....
    ...
    ..
    string result = JsonConvert.SerializeObject(_d);
    HttpContext.Current.Response.Clear();
    HttpContext.Current.Response.ContentType = "application/json";
    HttpContext.Current.Response.AddHeader("content-length", result.Length.ToString());                HttpContext.Current.Response.Flush();
    HttpContext.Current.Response.Write(result);
    HttpContext.Current.ApplicationInstance.CompleteRequest();
}

edited Feb 21, 2018 at 14:01

Stephen Kennedy

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answered Oct 18, 2016 at 7:30

pinale

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1 Comment

Stephen Kennedy Over a year ago

That's the only way to override the default serializer for page and asmx methods that I know of.

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