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I am getting this error:
Arraylist' does not contain a definition for 'Add' and no accessible extension method 'Add' accepting a first argument of type 'Arraylist' could be found (are you missing a using directive or an assembly reference?)

Here is the code where the error is popping up:
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;

using EntitiesLayer;

namespace DataLayer
    public class D_Dashboard
        readonly SqlConnection connect = new SqlConnection(ConfigurationManager.ConnectionStrings["SistDB"].ConnectionString);

        SqlCommand command;
        SqlDataReader dataReader;

        public void PreferedClients(E_Dashboard entityObject)
            command = new SqlCommand("SPClientes_Preferidos", connect) 
                CommandType = CommandType.StoredProcedure

            dataReader = command.ExecuteReader();

            while (dataReader.Read()) 
                entityObject.CantFacturado.Add(dataReader.GetInt32(1)); //Here is where the error pops up


As there is references to the E_Dashboard class, here's the class' code:
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EntitiesLayer
    public class E_Dashboard
        public ArrayList Profesionales { get; set; } = new ArrayList();

        public ArrayList CantClientes { get; set; } = new ArrayList();

        public ArrayList Clientes { get; set; } = new ArrayList();

        public Arraylist CantFacturado { get; set; } = new ArrayList();

        public static decimal TOTALVENTASDIA { get; set; }

        public int TotalClientes { get; set; }

        public int TotalProfesionales { get; set; }


What I have tried:

I tried checking which .Net framework version was the project using, which is the newest available for me (4.7.2). I have a few days checking the internet and my code without getting to a solution, all this because I really don't know what else to do. Thanks in advance.
Updated 7-Feb-22 12:04pm
Richard Deeming 8-Feb-22 3:56am    
Don't use ArrayList; it's ancient and should be marked as obsolete. Use the List<T> class instead, specifying the correct type for the data you will be storing in your list.
Héctor Febles 8-Feb-22 9:01am    
Thanks, I will update the code to use the List<t> class instead after some testing is done.

1 solution

In your E_Dashboard class, Arraylist is not the same as ArrayList:
public Arraylist CantFacturado { get; set; } = new ArrayList();
Change that to "ArrayList".
Share this answer
CPallini 8-Feb-22 2:14am    
Héctor Febles 8-Feb-22 8:57am    
Thank you very much!

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