pass array to postgresql problem after package update

used the following code

C#

List<List<string>> items = new List<List<string>>();

foreach (OrderItemsDTO p in products)
{
    List<string> list = new List<string>();
    list.Add(p.product_id.ToString());
    list.Add(Convert.ToString(p.quantity, culture));
    list.Add(Convert.ToString(p.price, culture));
    list.Add(Convert.ToString(p.discount, culture));
    list.Add(Convert.ToString(p.total, culture));
    list.Add(Convert.ToString(p.cost, culture));
    list.Add(p.User.id.ToString());
    list.Add(p.order.ToString());
    items.Add(list);
}

command.Parameters.Add(null, NpgsqlTypes.NpgsqlDbType.Array | NpgsqlTypes.NpgsqlDbType.Varchar).Value = items.ToArray();

POSTGRESQL

CREATE OR REPLACE FUNCTION public.insert_request(
_character varying products[])
RETURNS integer
LANGUAGE 'plpgsql'
COST 100
VOLATILE PARALLEL UNSAFE
THE $BODY$
declare

it worked perfectly, but after I updated the Npgsql.dll package from version 2.0.12.0 to version 5.07.0, it crashed and returned the following error:

While trying to write an array, one of its elements failed validation. You may be trying to mix types in a non-generic IList, or to write a jagged array.

I can’t solve it at all.

The function in postgresql is working normally, the problem is in passing the parameters.

[DiegoSantanadss]

@roji muito obrigado, graças a você conseguir resolver o problema, acredite, parece besteira mas já tinha perdido um bom tempo tentando resolver.

Segue resolução.

      string[,] teste = new string[produtos.Count, 8];

        int y = 0;

        foreach (PedidoItensDTO p in produtos)
        {
            teste[y, 0] = p.id_produto.ToString();
            teste[y, 1] = Convert.ToString(p.quantidade, culture);
            teste[y, 2] = Convert.ToString(p.preco, culture);
            teste[y, 3] = Convert.ToString(p.desconto, culture);
            teste[y, 4] = Convert.ToString(p.total, culture);
            teste[y, 5] = Convert.ToString(p.custo, culture);
            teste[y, 6] = p.Usuario.id.ToString();
            teste[y, 7] = p.ordem.ToString();

            y++;
        }


   comando.Parameters.Add(null, NpgsqlTypes.NpgsqlDbType.Array | NpgsqlTypes.NpgsqlDbType.Varchar).Value = teste;

[DiegoSantanadss]

In this case, I have to pass an array of fixed dimensions. Right? but the problem is there, the matrix has to be dynamic, because the amount of products can vary, the fields will always be the same but the amount of lines is variable. So the List<List<string>> was serving me well.