请求参数到对象绑定的转换错误？

Question

使用jQuery DataTables + C＃Asp.NET MVC 5和服务器端功能，我为DataTable ajax请求构建了一个代表性的类（由official documentation指导）：

public class Query
{
    public List<QueryColumn> columns { get; set; }
    public List<QueryOrder> order { get; set; }
    public QuerySearch search { get; set; }

    public int draw { get; set; }
    public int start { get; set; }
    public int length { get; set; }
    public string dtid { get; set; }
}

public class QuerySearch
{
    public string value { get; set; }
    public string regex { get; set; }
}

public class QueryColumn
{
    public string data { get; set; }
    public string name { get; set; }
    public bool searchable { get; set; }
    public bool orderable { get; set; }
    public QuerySearch search { get; set; }
}

public class QueryOrder
{
    public enum Order
    {
        asc, desc
    }
    public int column{ get; set; }
    public Order dir { get; set; }
}

所有这些都遵循JSON属性映射要求的小写字母。另外，在javascript DataTable初始化中，我添加了所有列的定义：

$("#mydatatable").DataTable({
serverSide: true,
processing: true,
info: true,
order: [[0, 'asc']],
ajax: {
    data: function (d) {
        // Extra params to request
        d.dtid = iddt;
    },
    url: '@Url.Action("Home", "ListEntities")',
    dataType: 'json',
    method: 'POST',
    dataSrc : "entities"
}
lengthMenu: [[15, 50, 100], [15, 50, 100]],
pageLength : 15,
columns: [
    { name: "Entidad", data: "NombreEntidad", title: "Entidad" },
    { name: "Numero", data: "Numero", title: "Numero" },
    { name: "Fecha", data: "Fecha", title: "Fecha" },
    { name: "Estado", data: "Estado", title: "Estado" },
    { name: "ConsignadoA", data: "ConsignadoA", title: "Consignado a:" },
    { name: "Identificador", data: "Id", "searchable": false, "sortable": false, title: "Acciones" }
]
});

此时，一切看上去都很正确，但是调试请求时，它填充了Query类，但列和订单子列表除外，如图所示：

知道为什么会这样吗？