Question

我有一个listcheckedbox，列出了员工编号，我希望能够添加参加培训课程的每位员工，以便在培训课程中显示。但是，当我尝试提交要插入数据库的信息时，它只会添加一个选定的员工。我怎样才能让超过1名员工提交课堂会议？

try
            {
                string cmdstring = "INSERT INTO [SESSION] (PrincipleName, Comments, SessionDate, SessionName, TellerNum) VALUES (@principle, @comments, @date, @session, @teller)";
                using (OleDbCommand cmd = new OleDbCommand(cmdstring, con))
                {
                    cmd.Parameters.AddWithValue("@principle", comboBox12.Text);
                    cmd.Parameters.AddWithValue("@comments", textBox3.Text);
                    cmd.Parameters.AddWithValue("@date", dateTimePicker1.Value);
                    cmd.Parameters.AddWithValue("@session", comboBox1.Text);
                    cmd.Parameters.AddWithValue("@teller", checkedListBox1.Text);

                    con.Open();
                    cmd.ExecuteNonQuery();
                    con.Close();
                    MessageBox.Show("Submitted Successfully");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Failed due to " + ex.Message);
            }

以下是LarsTech回答

后的更新代码

                    con.Open();
                    string cmdstring = "INSERT INTO [SESSION] (PrincipleName, Comments, SessionDate, SessionName, TellerNum) VALUES (@principle, @comments, @date, @session, @teller)";
                    foreach (int s in checkedListBox1.CheckedItems)
                    {
                        using (OleDbCommand cmd = new OleDbCommand(cmdstring, con))
                        {
                            cmd.Parameters.AddWithValue("@principle", comboBox12.Text);
                            cmd.Parameters.AddWithValue("@comments", textBox3.Text);
                            cmd.Parameters.AddWithValue("@date", dateTimePicker1.Value.ToShortDateString());
                            cmd.Parameters.AddWithValue("@session", comboBox1.Text);
                            cmd.Parameters.AddWithValue("@teller", s);

                            cmd.ExecuteNonQuery();
                        }
                    }
                            con.Close();
                            MessageBox.Show("Submitted Successfully");
                            textBox3.Clear();
                            checkedListBox1.ClearSelected();
                            comboBox1.Refresh();
                            comboBox12.Refresh();
                            dateTimePicker1.Refresh();

Answer 1

您必须遍历CheckedItems集合：

foreach (string s in checkedListBox1.CheckedItems)
{
  using (OleDbCommand cmd = new OleDbCommand(cmdstring, con))
  {
    cmd.Parameters.AddWithValue("@principle", comboBox12.Text);
    cmd.Parameters.AddWithValue("@comments", textBox3.Text);
    cmd.Parameters.AddWithValue("@date", dateTimePicker1.Value);
    cmd.Parameters.AddWithValue("@session", comboBox1.Text);
    cmd.Parameters.AddWithValue("@teller", s);
    cmd.ExecuteNonQuery();
  }
}

将多个项目从checkedlistbox插入AccessDB

1 个答案: