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Popularfan
Asked: 2022-08-19 02:37:51 +0800 CST 2022-08-19 02:37:51 +0800 CST

Inside a list how to access one of its values ​​declared as "Object" in C#

  • 772

I have the following declared:

List<Object> misObjetos = new List<Object>();
misObjetos.Add( new { precio = 1500 , nombre = "Ciclomotor" } );
misObjetos.Add( new { precio = 300  , nombre = "Patinete"   } );

How do I access, for example, the price of the second element of the list?

I have tried misObjetos[1].preciobut it doesn't work.

c#

3 Answers

  1. Simply do not define the type of the variable because you do not know it, use varinstead and an array that you can then return to List<T>using .ToList()and you also have to initialize them together with the variable declaration:

    var misObjetos = new[] {
    new { precio = 1500, nombre = "Ciclomotor" },
    new { precio = 300, nombre = "Patinete" },
}.ToList();

    Another option could be using tuples:

    var misObjetos = new List<(int precio, string nombre)>();
misObjetos.Add((precio: 1500, nombre: "Ciclomotor"));
misObjetos.Add((precio: 300, nombre: "Patinete"));

    Either way you can accessmisObjetos[1].precio

    • 5
  2. Best Answer

    You have two alternatives, personally I prefer to use dynamic, which basically tells the compiler that the data type of the variable is resolved in execution mode

        List<dynamic> misObjetos = new List<dynamic>();
    misObjetos.Add(new { precio = 1500, nombre = "Ciclomotor" });
    misObjetos.Add(new { precio = 300, nombre = "Patinete" });

    foreach(var obj in misObjetos)
    {
        Console.WriteLine(obj.precio);
        Console.ReadLine();
    }
    //segunda alternativa usando tipos anonimos
    var nodes = (new[] { new { precio = 1500, nombre = "Ciclomotor" } }).ToList();
    nodes.Add(new { precio = 300, nombre = "Patinete" });

    Console.WriteLine(nodes[0].precio);
    Console.ReadLine();

    The second option is to create a new list with the first record so that the compiler knows the structure of the anonymous type. Based on the answer from https://stackoverflow.com/questions/1203522/how-to-access-property-of-anonymous-type-in-c which is basically the same case

    • 2

  3. If you are going to handle objects with the same structure you can always declare a class beforehand:

    class MiObjeto
{
public int precio { get; set; }

public string nombre { get; set; }
}

    And you indicate that the list you will use contains that type of object:

        List<MiObjeto> misObjetos = new List<MiObjeto>()
    {
    new MiObjeto() { precio = 1500, nombre = "Ciclomotor" },
    new MiObjeto() { precio = 300, nombre  = "Patinete" }
    };

    for(int i = 0; i < misObjetos.Count; i++)
    {
    Console.WriteLine(misObjetos[i].nombre + " - " + misObjetos[i].precio);
    }
    Console.ReadKey();
    • 1