Question

我正在尝试填充combobox表单oracle数据库然后根据来自combobox的所选值我想自动填充textbox1，textbox2和textbox3

这是我试图用来填充combobox的代码第一个问题是combobox加载为空第二，我想学习如何自动填充其他textboxs

如果有人可以帮助我或向我解释

    public void Fillcombobox()
    {
        string connstr = "data source=db;user id=user;password=pwd;";
        string cmdtxt = "select product_id, description from products";

        using (OracleConnection conn = new OracleConnection(connstr))
        using (OracleCommand cmd = new OracleCommand(cmdtxt,conn))
        {
            conn.Open();
            OracleDataReader dr;
            cmd.ExecuteReader();
            CB_PRODUCT_ID.DisplayMember = "product_id";
            CB_PRODUCT_ID.ValueMember = "description";

            while (dr.Read())
            {
                // what should I d to fill other textboxs ?
                TB_PRODUCTS.Text = ???;
            }
        }

    }

    private void CB_PRODUCT_ID_SelectedIndexChanged(object sender, EventArgs e)
    {
        Fillcombobox();
    }

Answer 1

你必须组合光标中的所有值，例如List<String>：

    public void Fillcombobox()
    {
        //TODO: do not hardcode connection string (esp. password), but load it
        string connstr = "data source=db;user id=user;password=pwd;";

        string cmdtxt = 
          @"select product_id, 
                   description 
              from products";

        using (OracleConnection conn = new OracleConnection(connstr))
        using (OracleCommand cmd = new OracleCommand(cmdtxt, conn))
        {
            conn.Open();

            // reader is IDisposable and should be closed
            using (OracleDataReader dr = cmd.ExecuteReader()) 
            {
                List<String> items = new List<String>();

                while (dr.Read())
                {
                    items.Add(String.Format("{0}, {1}", dr.GetValue(0), dr.GetValue(1)));
                } 

                TB_PRODUCTS.Items.AddRange(items.ToArray());
            }

        }

    }

修改：要更新TextBoxes（textbox1，textbox2和textbox3），建议您使用Combobox事件TextChanged：

private void TB_PRODUCTS_TextChanged(object sender, EventArgs e) {
  ComboBox cb = sender as ComboBox;

  // Either explicitly or via cb.SelectedIndex
  textbox1.Text = cb.Text;
}

Answer 2

  while (dr.Read())
            {
                TB_PRODUCTS.Text = dr["YourColumnName"].toString();
            }

如何填充组合框形式的oracle数据库？

2 个答案: