String truncate when performing append

Question

The code below serializes a JSON list and gives a append the variable result. However, from a certain amount of records (350), the text contained in result has a modified part for "..." . I performed the tests directly by selecting the entire list and also through the StringBuilder but getting the same result, only with the "..." in different places.

string result = string.Empty;
foreach(item in collection)
{
    string json = JsonConvert.Serialize(item);
    result += json; 
}

Excerpt from the broken json:

{"cnae1":null,"cnae2":null,"cnae3":null... A)"

As it should be:

{"cnae1":null,"cnae2":null,"cnae3":null,"part":null,"number":null,"type":null}

Answer 1

There’s no "nothing wrong"...

I ran a test using the same codebase as yours:

using System;
using System.Collections.Generic;
using Newtonsoft.Json;

namespace TesteConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            var lista = new List<Teste>();
            for (int i = 0; i < 300; i++)
                lista.Add(new Teste{id = i, nome = "Teste "+ i});

            var json = JsonConvert.SerializeObject(lista);

            Console.WriteLine(json);


            string result = string.Empty;
            foreach (var item in lista)
            {
                result += JsonConvert.SerializeObject(item);
            }


            Console.WriteLine(result);
            Console.ReadLine();
        }
    }
}


public class Teste
{
    public int id { get; set; }
    public string nome { get; set; }
}

Result of var json = JsonConvert.SerializeObject(lista):

[{"id":0,"nome":"Teste 0"},{"id":1,"nome":"Teste 1"},{"id":2,"nome":"Teste 2"},{"id":3,"nome":"Teste 3"},{"id":4,"nome":"Teste 4"}
[...]
{"id":297,"nome":"Teste 297"},{"id":298,"nome":"Teste 298"},{"id":299,"nome":"Teste 299"}]

Result of string result:

{"id":0,"nome":"Teste 0"}{"id":1,"nome":"Teste 1"}{"id":2,"nome":"Teste 2"}{"id":3,"nome":"Teste 3"}{"id":4,"nome":"Teste 4"}
    [...]
    {"id":297,"nome":"Teste 297"}{"id":298,"nome":"Teste 298"}{"id":299,"nome":"Teste 299"}

I believe the problem lies only in the visualization and familiarization of the IDE... If you in debug mode "hovers the mouse" on top of the variable you want to see, an ellipsis will appear in case what you are inspecting has a larger content "than fits" in the inspection preview:

If you click "on the magnifying glass":

EDIT:

Note that in the case of how you are doing, the result is a json invalid, contrary to what is done with the serialization of the entire list: var json = JsonConvert.SerializeObject(lista);

Json INVALID:

{"id":0,"nome":"Teste 0"},{"id":1,"nome":"Teste 1"}

{"id":0,"nome":"Teste 0"}{"id":1,"nome":"Teste 1"}

Json VALID:

[{"id":0,"nome":"Teste 0"},{"id":1,"nome":"Teste 1"}]