Question

I have a web service returning some Json stuff to my iPhone application and it works fine as long as the amount of returned data is kind of small but if I increase the amount of data that is returned the application is not able to process it. Is there a way to solve this, can’t possibly be a limit of 218KB…?

This is my current code:

[WebService(Namespace = "http://mydomain.com/webservicesfeed")]
[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 feedPerson : System.Web.Services.WebService
    {

        [WebMethod(BufferResponse = false)]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public List<Person> getData()
        {
            List<Person> res = new List<Person>();
                res = searchPerson("32.8762", "13.1875");
            return res;
        }
    }

If I call the web service throw jQuery it also fails so I guess the problem is at the web service..

This is the jQuery code I used to try it out:

 <script type="text/javascript">
     $.ajax({
         type: "POST",
         contentType: "application/json; charset=utf-8;",
         url: "http://mydomain.com/feedPerson.asmx/getData",
         dataType: "json",
         success: function (data, textStatus, jqXHR) {
             alert(data.d[0]);
         },
         error: function (jqXHR, textStatus, errorThrown) {
             alert("Fail");
         }
     });
    </script>

How could this be solved?

Answer 1

Catching the error gave me the following information: “The length of the string exceeds the value set on the maxJsonLength property”.

Then I found this post: Can I set an unlimited length for maxJsonLength in web.config?

and by setting the following in my web.config:

<system.web.extensions>
    <scripting>
        <webServices>
            <jsonSerialization maxJsonLength="2147483647"/>
        </webServices>
    </scripting>
</system.web.extensions>

The issue was solved.