From this project I will share how to create a constructor or maybe you need for method that use array parameters.

Design of implementation in KNN node class will be like this :

KNNNode node1 = new KNNNode("Rose", 2.5, 4, 4.2);
KNNNode node2 = new KNNNode("Height", 2.5, 4, 4.2, 4.5, 6.3);

So you can add more parameters to that class.

Here my code in KNNNode class :

using System.Collections.Generic;

namespace Algorithm.KNN
{
    public class KNNNode
    {
        List val;
        string label;

        public string Label
        {
            get { return label; }
            set { label = value; }
        }

        // 'params float[] val' it will create array parameters
        public KNNNode(string label, params float[] val)
        {
            //set label
            this.label = label;
            //Set actual size of val
            this.val = new List(val.Length); 

            //iterate from first to last argument
            //and fill to list
            foreach (float v in val)
            {
                this.val.Add(v);
            }
        }

        public int Count
        {
            get {
                return val.Count;
            }
        }

        //prevent default constructor inisialization
        private KNNNode()
        { }

        //Direct access to list value
        public float this[int index]
        {
            get { return val[index]; }
            set { val[index] = value; }
        }
    }
}

Hope it’s help
Willy Achmat Fauzi

Settings is setting class in .NET you can click on project->properties->settings to generate this class. You can find this file in Debug folder that have .config extension.

Here is my Data Access class manage command from C# to MySQL database.

    public class DataAccess
    {
        static internal string GetConnectionString()
        {
            return String.Format("server={0};user id={1};Password={2};database={3}",
                Settings.Default.DbServer, Settings.Default.DbUserId, Settings.Default.DbPassword,
                Settings.Default.DbName);
        }

        static DataAccess()
        { }

        public static DataTable ExecuteSelectCommand(MySqlCommand command)
        {
            DataTable table = null;
            try
            {
                command.Connection.Open();
                MySqlDataReader reader = command.ExecuteReader();
                table = new DataTable();
                table.Load(reader);
                reader.Close();
            }
            catch (Exception ex)
            {
                System.Windows.MessageBox.Show(ex.Data.ToString());
            }
            finally
            {
                command.Connection.Close();
            }
            return table;
        }

        public static MySqlCommand CreateCommand()
        {
            string dataProviderName = Settings.Default.DbProvoderName;
            string connectionString = GetConnectionString();
            MySqlConnection conn = new MySqlConnection();
            conn.ConnectionString = connectionString;
            MySqlCommand comm = conn.CreateCommand();
            return comm;
        }

        public static int ExecuteNonQuery(MySqlCommand command)
        {
            int affectedRows = -1;
            try
            {
                command.Connection.Open();
                affectedRows = command.ExecuteNonQuery();
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                command.Connection.Close();
            }
            return affectedRows;
        }
    }

Now here’s the sample to call that DataAccess class

    public class Golongan
    {
        private int idGolongan;
        private string namaGolongan;

        public int IdGolongan
        {
            get { return idGolongan; }
            set { idGolongan = value; }
        }

        public string NamaGolongan
        {
            get { return namaGolongan; }
            set { namaGolongan = value; }
        }

        public Golongan()
        { }

        public Golongan(int idGolongan, string namaGolongan)
        {
            this.idGolongan = idGolongan;
            this.namaGolongan = namaGolongan;
        }

        public static DataTable SelectAllGolongan()
        {
            MySqlCommand command = DataAccess.CreateCommand();
            command.CommandText = "select * from golongan";
            DataTable table = DataAccess.ExecuteSelectCommand(command);
            return table;
        }

        public int InsertGolongan()
        {
            MySqlCommand commmand = DataAccess.CreateCommand();
            commmand.CommandText = "insert into golongan (golongan) " +
                                    "values(    '" + this.namaGolongan + "')";

            return DataAccess.ExecuteNonQuery(commmand);
        }

        public int UpdateGolongan()
        {
            MySqlCommand commmand = DataAccess.CreateCommand();
            commmand.CommandText =
                String.Format("update golongan set golongan = '{0}' where idgolongan = {1}",
                this.namaGolongan, this.idGolongan);

            return DataAccess.ExecuteNonQuery(commmand);
        }

        public int DeleteGolongan()
        {
            MySqlCommand commmand = DataAccess.CreateCommand();
            commmand.CommandText =
                String.Format("delete from golongan where idgolongan = {0}",
                this.idGolongan);

            return DataAccess.ExecuteNonQuery(commmand);
        }
}

Hope it’s help
Willy Achmat Fauzi