public void DataContractJsonSerializerSerializesAggregates()
        {
            using (var stream = new MemoryStream())
            {
                var serializer = new DataContractJsonSerializer(typeof(DataSourceResult<Person>), new [] { typeof (Person) });

                var people = new[] { new Person { Age = 30 }, new Person { Age = 30 } };

                serializer.WriteObject(stream, people.AsQueryable().ToDataSourceResult(1, 2, null, null, new [] { new Aggregator {
                    Aggregate = "sum",
                    Field = "Age"
                } }));

                var json = Encoding.UTF8.GetString(stream.ToArray()).Replace("\"__type\":\"DynamicClass2:#\",", "");

                Assert.AreEqual("{\"Aggregates\":{\"Age\":{\"sum\":60}},\"Data\":[],\"Total\":2}", json);
            }
        }