Question

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Can I set an unlimited length for maxJsonLength in web.config?

I have a script in my .aspx page that is sending info to the back-end .cs page. Concept is simple and worst for most occasions, except when data is too large. How can I increase the capacity of what the “data” variable can hold without modifying web.config? Please see code below.

.ASPX

<script type="text/javascript">
    $(document).ready(function () {
        var note = "";
        for (var i = 0; i < 200000; i++)
            note = note + "x";

        $.ajax({
            type: "POST",
            url: "GroupDetailsDisplayPlus.aspx/UpdateRecord",
            data: "{note: \"" + note + "\"}",
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (msg) {
                var response = msg.d;
                alert("success");
                }
            error: function (request, status, thrownError) {
                //alert(request.thrownError); // short version
                alert(request.responseText);  // long version
            }
        });
    });
</script>

.CS

    [System.Web.Services.WebMethod]
    public static string UpdateRecord(string note)
    {
        return note;
    }

This code is simplified and my purpose is to store this large string in a database (code ommited). If I set the for loop to only do 100,000 cycles this works. However increasing it to 200,000 cycles fails with an error message:

{“Message”:”Error during serialization or deserialization using the
JSON JavaScriptSerializer. The length of the string exceeds the value
set on the maxJsonLength property.\r\nParameter name:
input”,”StackTrace”: at
System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(JavaScriptSerializer
serializer, String input, Type type, Int32 depthLimit)\r\n at
System.Web.Script.Serialization.JavaScript
Serializer.Deserialize[T](String input)\r\n at
System.Web.Script.Service.RestHandler.ExecuteWebServiceCall(HttpContext
context, WebServiceMethodData
methodData)”,”ExceptionType”:”System.ArgumentException”}

Thank you for any and all help.

Answer 1

Try this:

<system.web.extensions>
    <scripting>
      <webServices>
        <jsonSerialization maxJsonLength="500000">
        </jsonSerialization>
      </webServices>
    </scripting>
</system.web.extensions>

and this:

<system.web>
  <httpRuntime requestValidationMode="2.0" executionTimeout="600" maxRequestLength="2000000" />
<system.web>

or divide your data and send part by part:

var portionIndex = 0;
var porions = new Array();
for(i = 0; i < 5; i++)
{
    var note = '';
    for (var j = 0; j < 40000; j++) note += "x";
    portions.push(note);
}

SendPortion();

function SendPortion()
{
        $.ajax({
            type: "POST",
            url: "GroupDetailsDisplayPlus.aspx/UpdateRecord",
            data: {porionsCount: porions.length, portion: porions[portionIndex] },
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (msg) {
                portionIndex++; 
                if(portionIndex < porions.length) 
                    SendPortion();
            }
            error: function (request, status, thrownError) {}
        });
}