Difficulty in picking up a certain type of return in c#

Question

I have a return that I send via Ajax that it returns in the URL as follows:

"http://localhost:11910/ProtocoloExterno/Inserir?itensContrato[0][id]=4&itensContrato[0][valorUsado]=150000,00&itensContrato[1][id]=9&itensContrato[1][valorUsado]=10050,00&contrato=4100001124&codigoParceiro=7900325&nomeParceiro=ORANGE COTE D%23IVOIRE S.A.&areaReclamacao=&codigoPatrimonial=5411050&operadora=Móvel&statusObra=&nFRN=&endereco=Rua Ursulina de Melo&estado=AM&cidade=78&descItem=desc&icms=15100,00&ipi=410,00&contaContabil=Capital não chamado&ordemInterna=Rua Ursulina de Melo&quantidade=1&valorUnitario=160050,00&valorTotal=160050,00&numeroPedido=11000110&itemPedido=10&observacao="

When I put Request.QueryString["endereco"]; for example, got cute, the biggest difficulty is to get the data that send from an array via ajax.

Excerpt that I send via javascript

$(document).on('click', "#btnSalvar", function () {

    var erros = 0;
    $("div").find('*').each(function () {
        var classe = $(this).attr("class");
        if (classe !== undefined) {
            var numItems = $('.has-error').length;
            if (numItems > 0) {
                return false;
            }
            else {
                //debugger;
                itensContrato = [];

               $("input:checked").each(function () {
                    var id = $(this).data("id");
                    var valorUsado = $(".txt" + id).val();
                    itensContrato.push({ id: id, valorUsado: valorUsado })

                });

               debugger;
                $.ajax({
                    type: 'GET',
                    url: 'Inserir',
                    dataType: 'JSON',
                    data: {
                        itensContrato: itensContrato,
                        contrato: $("#cmbContrato").val(),
                        codigoParceiro: $("#lblCodigoParceiro").html(),
                        nomeParceiro: $("#lblNomeParceiro").html(),
                        tipoContrato: $("#cmbTipoContrato").val(),
                        areaReclamacao: $("#lblAreaReclamacao").html(),
                        codigoPatrimonial: $("#txtCodigoPatrimonial").val(),
                        operadora: $("#cmbOperadora").val(),
                        statusObra: $("#cmbStatusObra").val(),
                        nFRN: $("#txtNFnr").val(),
                        endereco: $("#txtEndereço").val(),
                        estado: $("#cmbEstado").val(),
                        cidade: $("#cmbCidade").val(),
                        descItem: $("#txtDescricaoItem").val(),
                        icms: $("#txtICMS").val(),
                        ipi: $("#txtIPI").val(),
                        contaContabil: $("#lblContaContabil").html(),
                        ordemInterna: $("#txtOrdemInterna").val(),
                        quantidade: $("#txtQuantidade").val(),
                        valorUnitario: $("#txtValorUnitario").val(),
                        valorTotal: $("#txtValorTotal").val(),
                        numeroPedido: $("#txtNumeroPedido").val(),
                        itemPedido: $("#txtItemPedido").val(),
                        observacao: $("#txtObservacao").val()
                    }
                });
                return false;
            }
        }

    });
});

If I indicate a parameter as itensContract[0][id] it can get the right value, but since I don’t know how many itensContract has, I wanted to go through the url in such a way that I found the amount of itensContract[pos][id] and itensContract[pos][useUsed]

Answer 1

I have some suggestions for you.

First, never treat JSON on the nail. On your side of C#, create a class that has exactly the same JSON data on the Javascript side. Example:

public class ItemContrato { 
    public int Id { get; set; }
    public string ValorUsado { get; set; }
}

public class RetornoJson { 
    public ItemContrato [] ItensContrato { get; set; }
    public int CodigoParceiro { get; set; }
    public string NomeParceiro { get; set; }
    ...
}

This is called working with data models. As soon as your template reflects exactly the data you are sending, you can use this code:

string jsonResultado = Request.QueryString...
var resultado = JsonConvert.DeserializeObject<RetornoJson>(jsonResultado);

Try to play a little the variable jsonResultado so you can see the magic. You need to install the Newtonsoft.Json package first. After everything is objects in your C#, you no longer have to worry about the conversion itself.. and adding and removing elements becomes easier later.

In this documentation you will find more examples: Deserialize an Object

From there it will be easy to use the data:

var qtdContratos = resultado.ItensContrato.Count; // só não esqueça de ver se está null antes disso
foreach(var itemContrato in resultado.ItensContrato) {}

The second tip is how you are passing the data to the server. It does not follow the JSON standard. When we work with numeric values, there is no comma, as you are using. Every string needs to have an "scape".

Take this example: https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/JSON

After you have started to see what a JSON is, try to see if your Querystring is returning a valid JSON. Otherwise you will face problems.