How do I check if an answer in json comes empty from a webservice .svc?

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How do I check if an answer in json comes empty from a webservice .svc?

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I do a post from a form and when the json returns with the objects of a sql table it gives me without problems .. but when there is no data in the table and returns empty the json returns it to me badly formed example I want to control it for that I do not get errors like in the image

{"data:]"}

c# .net ajax

asked by emanuelle 10.02.2018 в 09:18

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Calculation of table with Jquery How to validate wizard button

score 0 · Answer 1

I did an update today

    public Stream buscaPedim(string usuario, string estado, string buscarPor, string fecha_ini, string fecha_fin)
    {


        getPedimentos Pedimentos = new getPedimentos();
        string res = Pedimentos.consulta(usuario, estado, buscarPor, fecha_ini, fecha_fin);

        if (res != null)

            WebOperationContext.Current.OutgoingResponse.ContentType =
   "application/json; charset=utf-8";
        if (res == "")
        {
            //que puedo hacer aqui con el json vacio?
        }
        else 
        return new MemoryStream(Encoding.UTF8.GetBytes(res));
    }