Why am I getting Http error 500 when I return too many rows as json in my ajax call? - asp.net

Question

Here is my code:
var context = _contextFactory.Create(GetClient());
var r = from p in context.MyTable.ToList()
select p;
int tot;
var firstPageData = PagedResult(r, 0, 200000, rows => new { rows.Id }, true, out tot);
return Json(new { result = "ok", rows = firstPageData }, JsonRequestBehavior.AllowGet);
The first and second parameter to PagedResult() (0 and 200000) are the pagenumber and number of rows to return. This is returning http error 500.
But when I change the 2nd parameter to PagedResult() to return only 20 rows, it's working fine. Like this:
var context = _contextFactory.Create(GetClient());
var r = from p in context.MyTable.ToList()
select p;
int tot;
var firstPageData = PagedResult(r, 0, 20, rows => new { rows.Id }, true, out tot);
return Json(new { result = "ok", rows = firstPageData }, JsonRequestBehavior.AllowGet);
Is it I am getting this error because I am returning too many rows that http can't handle? Or are there configurations I need to make so I can return these too many rows?
Thanks,

Answer 1

use a custom JsonResult Class for ASP.Net MVC to avoid MaxJsonLength Exceeded Exception.
public class LargeJsonResult : JsonResult
{
const string JsonRequest_GetNotAllowed = "This request has been blocked because sensitive information could be disclosed to third party web sites when this is used in a GET request. To allow GET requests, set JsonRequestBehavior to AllowGet.";
public LargeJsonResult()
{
MaxJsonLength = 1024000;
RecursionLimit = 100;
}
public int MaxJsonLength { get; set; }
public int RecursionLimit { get; set; }
public override void ExecuteResult( ControllerContext context )
{
if( context == null )
{
throw new ArgumentNullException( "context" );
}
if( JsonRequestBehavior == JsonRequestBehavior.DenyGet &&
String.Equals( context.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase ) )
{
throw new InvalidOperationException( JsonRequest_GetNotAllowed );
}
HttpResponseBase response = context.HttpContext.Response;
if( !String.IsNullOrEmpty( ContentType ) )
{
response.ContentType = ContentType;
}
else
{
response.ContentType = "application/json";
}
if( ContentEncoding != null )
{
response.ContentEncoding = ContentEncoding;
}
if( Data != null )
{
JavaScriptSerializer serializer = new JavaScriptSerializer() { MaxJsonLength = MaxJsonLength, RecursionLimit = RecursionLimit };
response.Write( serializer.Serialize( Data ) );
}
}
}
and use it as
return new LargeJsonResult { Data = Your Data, JsonRequestBehavior = `System.Web.Mvc.JsonRequestBehavior.AllowGet };`