Json.SerializeObject OutOfMemory Exception

Question

I have a list with about 400 objects, and every time I try to serialize it I get an outofmemory exception.

The problem is that I am monitoring the server memory, and it never goes more than 40% usage, so I am kinda lost with this error.

 try
 {
    str = JsonConvert.SerializeObject(list);
 }
 catch(Exception ex)
 {
    throw ex;
 }

I double checked and the class serialized does not have complex type or reference to other object of the same type.

I even get the same exception if I try to do list.First()

namespace ilimitada.ServicioDistribucion.AnalisisDatos.Entidades
{
    using ilimitada.Dominio.Pervasive.SCI.Core.Enumeradores;
    using System;
    using System.Runtime.CompilerServices;

    public class CuentaCobrar
    {
        public CuentaCobrar()
        {
            this.Nit = string.Empty;
            this.TipoNit = string.Empty;
            this.RazonSocial = string.Empty;
            this.PrimerNombre = string.Empty;
            this.SegundoNombre = string.Empty;
            this.PrimerApellido = string.Empty;
            this.SegundoApellido = string.Empty;
            this.Direccion = string.Empty;
            this.CodigoCiudad = string.Empty;
            this.Indicativo = string.Empty;
            this.Telefono = string.Empty;
            this.Celular = string.Empty;
            this.Email = string.Empty;
            this.CodigoMunicipio = string.Empty;
            this.CodigoPais = string.Empty;
            this.Plazo = 0;
            this.CodigoActividadEconomica = string.Empty;
            this.Naturaleza = string.Empty;
            this.TieneRut = "No";
            this.Activo = "No";
            this.TipoTransaccion = Transaccion.Ninguna;
            this.Documento = string.Empty;
            this.OrdenFacturacion = string.Empty;
            this.DocumentoReferencia = string.Empty;
            this.SaldoDocumento = 0.0;
            this.FechaDocumento = DateTime.Now;
            this.FechaVencimiento = DateTime.Now;

            this.Compania = string.Empty;
        }

        public string Activo { get; set; }

        public string Celular { get; set; }

        public string CodigoActividadEconomica { get; set; }

        public string CodigoCiudad { get; set; }

        public string CodigoMunicipio { get; set; }

        public string CodigoPais { get; set; }

        public string Direccion { get; set; }

        public string Documento { get; set; }

        public string DocumentoReferencia { get; set; }

        public string Email { get; set; }

        public DateTime FechaDocumento { get; set; }

        public DateTime FechaVencimiento { get; set; }

        public string Indicativo { get; set; }

        public string Naturaleza { get; set; }

        public string Nit { get; set; }

        public string OrdenFacturacion { get; set; }

        public int Plazo { get; set; }

        public string PrimerApellido { get; set; }

        public string PrimerNombre { get; set; }

        public string RazonSocial { get; set; }

        public double SaldoDocumento { get; set; }

        public string SegundoApellido { get; set; }

        public string SegundoNombre { get; set; }

        public string Telefono { get; set; }

        public string TieneRut { get; set; }

        public string TipoNit { get; set; }

        public Transaccion TipoTransaccion { get; set; }

        public string Compania { get; set; }
    }
}

this is the enum

public enum Transaccion
    {
        Ninguna = 0,
        OtrasCxP = 9,
        Compra = 10,
        NDCompras = 11,
        NCCompras = 12,
        NDOtrasCxP = 13,
        NCOtrasCxP = 14,
        TransladosEntreBodegas = 15,
        OtrasEntradas = 16,
        OtrasSalidas = 17,
        EntradasMercanciaConsignacion = 18,
        SalidadasMercanciaConsignacion = 19,
        ConsumosDonacion = 20,
        AnulacionConsumosDonacion = 21,
        Venta = 30,
        VentasMostrador = 31,
        NCVentas = 33,
        NDVentas = 34,
        NDChequesDev = 40,
        NCChequesDev = 41,
        NDCargosVarios = 42,
        NCAbonosVarios = 43,
        AnticipoCxC = 44,
        NDInteresMora = 45,
        NCBanco = 70,
        NDBanco = 71,
        Cheques = 72,
        Consignaciones = 73,
        TrasladosBancarios = 74,
        AnticipoCxP = 75,
        ChequesAnulados = 76,
        ReciboCaja = 90,
        AnulacionReciboCaja = 91,
        CostosProduccion = 95
    }

What happens if you serialize only a few items of that list? What does it generate? — Jeroen van Langen
– Jeroen van Langen, Commented Jan 19, 2016 at 18:52
Do you have to serialize to a string? Depending on what you're doing with the data, you might be able to stream the JSON directly to its destination. — user5090812
– user5090812, Commented Jan 19, 2016 at 18:55
What is the size of each object? Can you show how the class looks like? — Yacoub Massad
– Yacoub Massad, Commented Jan 19, 2016 at 18:59

Oluwafemi · Accepted Answer · 2016-01-19 20:01:54Z

2

Circular reference could lead to OutOfMemory Exception. Try to check this is not the case because I ran into that exception a couple of times.

Where we have an item in a list which points to an item which in turn points to the first item in the list, thus leading to infinite loop in the serialization process.

Update:

You can ignore circular reference by updating your code like so:

 try
 {
    str = JsonConvert.SerializeObject(list, Formatting.Indented, 
                            new JsonSerializerSettings { 
                                   ReferenceLoopHandling = ReferenceLoopHandling.Ignore 
                            });
 }
 catch(Exception ex)
 {
    throw ex;
 }

edited Jan 19, 2016 at 20:01

answered Jan 19, 2016 at 19:26

Oluwafemi

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4 Comments

Luis Valencia Over a year ago

please see update, I dont think it can be circular reference, the class has only native types, not reference to other types

Oluwafemi Over a year ago

What is in Transaccion and do you still get the same error with the code above?

Luis Valencia Over a year ago

see uodate, and yes i get the same exception with code above

Oluwafemi Over a year ago

I tried out your code by creating 400 objects in memory and I didn't get any errors. Try to restart your computer and try again. Also check that you are using the latest JSON library.

Community · Accepted Answer · 2017-05-23 10:27:58Z

0

Like @Oluwafemi said you might have Circular Reference. You can check it by using NDepend Detect Dependency Tool.

You can also might read more by Find out the size of a .net object

edited May 23, 2017 at 10:27

CommunityBot

11 silver badge

answered Jan 19, 2016 at 19:36

Vlad Bezden

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2 Comments

Luis Valencia Over a year ago

please see update, I dont think it can be circular reference, the class has only native types, not reference to other types

Vlad Bezden Over a year ago

What is Transaccion object? How does it look? Also you can use my second part of the answer to check how big is the size of your object.

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