How to populate a combobox from a Access dataset / Database

问题

ive hit a brick wall on what to do next to populate a combobox from a data set currently i have. my database is call "PID2db.mdb" and the table is called "Customer"

        string strCon = Properties.Settings.Default.PID2dbConnectionString;
        OleDbConnection conn = new OleDbConnection(strCon);
        try {
            conn.Open();
            string strSql = "Select forename,surname from customer where [customerID] ='" + txtName.Text + "'";
             OleDbDataAdapter adapter = new OleDbDataAdapter(new OleDbCommand(strSql, conn));
            DataSet ds = new DataSet();
            adapter.Fill(ds);
            cboName.DataSource = ds.Tables[0];
            cboName.DisplayMember = "forename";
            cboName.ValueMember = "surname";
        }
        finally {
            conn.Close();
        }
    }

any help is appreciated, thanks

edit: added new code segments

回答1:

Assuming you have a Form with:

Combobox named cboName
TextBox named txtName

Try this :

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            LoadCustomerOnCombo();
        }

        private void LoadCustomerOnCombo()
        {
            string strCon = Settings.Default.PID2dbConnectionString;

            try
            {
                using (OleDbConnection conn = new OleDbConnection(strCon))
                {
                    conn.Open();
                    string strSql = "SELECT forename &\" \" & surname AS FullName, surname FROM customer"; //WHERE [customerID] ='" + txtName.Text + "'";
                    OleDbDataAdapter adapter = new OleDbDataAdapter(new OleDbCommand(strSql, conn));
                    DataSet ds = new DataSet();
                    adapter.Fill(ds);
                    cboName.DataSource = ds.Tables[0];
                    cboName.DisplayMember = "FullName";
                    cboName.ValueMember = "surname";
                }     
            }
            catch (Exception ex)
            {
                txtName.Text = ex.Message;
                Console.WriteLine(ex.Message);
            }
        }
    }

If worked so please tell me how is the where, left commented at the moment, else there are any errors, you'll see inside the textbox.

回答2:

You need to create a new DataSet, fill it with Data and finally set the ComboBox's DataSource, DisplayMember and ValueMember properties. Here is the code:

using System.Data.OleDb;

            string strCon = Properties.Settings.Default.PID2dbConnectionString;
            OleDbConnection conn = new OleDbConnection(strCon);
            try {
                conn.Open();
                string strSql = "Select forename,surname from customer where customer id ='" + txtName.Text + "'";
                OleDbDataAdapter adapter = new OleDbDataAdapter(new OleDbCommand(strSql, conn);
                DataSet ds = new DataSet();
                adapter.Fill(ds);
                comboBox1.DataSource = ds.Tables[0];
                comboBox1.DisplayMember = "forename";
                comboBox1.ValueMember = "surname";
            }
            finally {
                conn.Close();
            }

来源：https://stackoverflow.com/questions/14237639/how-to-populate-a-combobox-from-a-access-dataset-database

标签

combobox

dataset