ASP.NET "Data" Error: Trouble Parsing JSON Data on the Front-End

I am currently facing an issue with the configurations on my asmx page. The code is set up like this:

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Script.Serialization;
using System.Web.Services;
using Time.CSharpclasses;
/// <summary>
/// Summary description for LiquidityMonthAjax
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
[System.Web.Script.Services.ScriptService]
public class LiquidityMonthAjax : System.Web.Services.WebService

However, when I receive a response on the client side, the data seems to be in a format that I have never encountered before, despite using the same JSON parsing methods.

#document
 <string xmlns="tempuri.org">
["Presbyterian Health","Devon","LABS","Self-Pay","Sagamore"]
  </string>

This unexpected change has me puzzled. Normally, I retrieve my JSON data from .d.

Using Asp 4

I suspect there might be a missing dependency issue, but I'm not sure if it's on the client-side or server-side.

[WebMethod]
        public string getUniqueFinClass()
        {

            DataTable dt = ExcelManager.CreateDataTableFromSql(new XMLManager("liquiditymonth.xml").getReport(Xmls[6]));
            var r = from row in dt.AsEnumerable() select (string)row["FinancialClass"];
            return DictToJSON.serializeJSONObject(r.ToList());
        }

The problem seems to lie within the serializeJSONObject method which looks like this:

public static String serializeJSONObject(Object items)
    {
        System.Web.Script.Serialization.JavaScriptSerializer serializer = new

       System.Web.Script.Serialization.JavaScriptSerializer();
        serializer.MaxJsonLength = 2147483644;




        return serializer.Serialize(items);
    }

Despite having successfully used this method many times before, I can't pinpoint why it's causing issues now.

Answer №1

There are different variations of the .Net platform, with some returning d and others not. To ensure consistency in your code, consider including something like this:

var data = (response.hasOwnProperty("d")) ? d : response;

This will store the response in data regardless of the version of .Net being used, enhancing the reliability of your client-side code.

You can read more about this issue in Dave Ward's blog post:

Answer №2

The issue turned out to be on the client side. I had forgotten to stringify my object, causing jQuery to encode the arguments in the URL query string. An interesting functionality of ASP.net is that if the request is not in JSON format, the response defaults to XML, ignoring the request header type and any attempts by the programmer to specify JSON.

For more information, refer to this article about JSON, Objects, and Strings:

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