c# - WCF service not returning List<> System.Runtime.Serialization.SerializationException -

i call method leeralerta(), want return list of rows simple query.

this method makes query in linq:

internal list<alertas> leeralerta()  {     using (var db = new alertas2015())     {         var alertas = db.alertas.tolist();          return alertas;     } } 

this operation contract:

[operationcontract] list<alertas> leeralerta(); 

and object alertas:

public partial class alertas {     public int id { get; set; }     public int modulos_id { get; set; }     public string proceso { get; set; }     public string metodo { get; set; }     public string descripcion { get; set; }     public int estado { get; set; }     public string receptor { get; set; }     public system.datetime fecha { get; set; }     public system.datetime fecha_aceptada { get; set; }      public virtual modulos modulos { get; set; } } 

when call leeralertas stops connection and:

system.runtime.serialization.serializationexception i'm getting tracing it.

the message:

no se espera el tipo 'system.data.entity.dynamicproxies.alertas_7895cee569aebe6977614a1873db1d304f0cec3f6b5a87e3b3c324ba933840ca' con el nombre de contrato de datos 'alertas_7895cee569aebe6977614a1873db1d304f0cec3f6b5a87e3b3c324ba933840ca:http://schemas.datacontract.org/2004/07/system.data.entity.dynamicproxies'. intente usar datacontractresolver o agregar tipos no conocidos estáticamente la lista de tipos conocidos (por ejemplo, usando el atributo knowntypeattribute o agregándolos la lista de tipos conocidos que se pasa datacontractserializer).

i have 0 experience in serializing objects don't realy know how fix problem.

the answer @codecaster told me, put in dbcontext next thing:

configuration.proxycreationenabled = false;