The length of the string exceeds the value set on the maxJsonLength property. in MVC3

Question

MVC3 (.cshtml File)

$.getJSON(URL, Data, function (data) {

                    document.getElementById('divDisplayMap').innerHTML = data;

                    if (data != null) {
                        $('#myTablesId').show();
                        tdOnclickEvent();

                    }
                    else {
                        $('#myTablesId').hide();
                    }
                }).error(function (xhr, ajaxOptions, thrownError) { debugger; });

on Server Side

 public JsonResult ZoneType_SelectedState(int x_Id, int y_Id)
    {
    JsonResult result = new JsonResult();
     result.Data = "LongString";//Longstring with the length mention below
    return Json(result.Data,"application/json", JsonRequestBehavior.AllowGet);
    }

from the server side i am passing the string with the length of 1194812 and more than that. but i am getting the error saying the

"Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property."

Please help me out ASP

Answer 1

You could write a custom ActionResult which will allow you to specify the maximum length of data that the serializer can handle:

public class MyJsonResult : ActionResult
{
    private readonly object data;
    public MyJsonResult(object data)
    {
        this.data = data;
    }

    public override void ExecuteResult(ControllerContext context)
    {
        var response = context.RequestContext.HttpContext.Response;
        response.ContentType = "application/json";
        var serializer = new JavaScriptSerializer();
        // You could set the MaxJsonLength to the desired size - 10MB in this example
        serializer.MaxJsonLength = 10 * 1024 * 1024;
        response.Write(serializer.Serialize(this.data));
    }
}

and then use it:

public ActionResult ZoneType_SelectedState(int x_Id, int y_Id)
{
    string data = "LongString";//Longstring with the length mention below;
    return new MyJsonResult(data);
}

Answer 2

Try to update your Controller method as shown below:

public JsonResult ZoneType_SelectedState(int x_Id, int y_Id)
{
    var result = Json("LongString", JsonRequestBehavior.AllowGet);
    result.MaxJsonLength = int.MaxValue;
    return result;
}

Hope this helps...