JsonResult is sending Json parsed object as empty array collection to browser [[]],[[]] - json

Question

I'm trying to add to the JsonResult object a parsed Json string, but I couldn't do it, the parser object in the browser is shown as:
"filter":[[[]],[[[],[]]]]
This is the full code
public JsonResult AjaxStandardGet(int id)
{
Standard ec = db.Standard.FirstOrDefault(s => s.IdStandard == id);
// inside filter: { "KeyDynamic1": "Value1", "KeyDynamic2": [ "AAA", "DDD"] }
var filter = JsonConvert.DeserializeObject(ec.Filter);
return Json(new
{
ec.IdStandard,
ec.Description,
filter,
ec.Observations,
Services = ec.StandardServices.Select(s => new {
s.IdStandardServices,
Tecnology = s.Tecnology?.Nombre,
ServiceType = s.ServiceType?.Description,
s.Quantity,
s.Cost,
Options = (!string.IsNullOrEmpty(s.Options) ? s.Options.Split(',') : null),
Total = s.Quantity * s.Cost
}),
Success = true
});
}
I can't create the model object because the filters are not allways the same.
I tried this:
Dictionary<string, object> filter = JsonConvert.DeserializeObject<Dictionary<string, object>>(ec.Filter);
And I get
"filter":{"KeyDynamic1":"Value1","KeyDynamic2":[[],[]]}

Answer 1

I suggest you to JToken or dynamic:
JToken filter = JToken.Parse(ec.Filter);
dynamic filter = JsonConvert.DeserializeObject<dynamic>(ec.Filter);
Here is working fiddle.
Update
It seems that JavaScriptSerializer is not able to do it. So you can serialize your result using Newtonsoft.Json and return it as a string:
var result = new
{
ec.IdStandard,
ec.Description,
filter,
ec.Observations,
Services = ec.StandardServices.Select(s => new {
s.IdStandardServices,
Tecnology = s.Tecnology?.Nombre,
ServiceType = s.ServiceType?.Description,
s.Quantity,
s.Cost,
Options = (!string.IsNullOrEmpty(s.Options) ? s.Options.Split(',') : null),
Total = s.Quantity * s.Cost
}),
Success = true
};
var json = JsonConvert.SerializeObject(result);
return Content(json, "application/json");