Question

那就是我的代码我尝试从我的mysql表到我的列表框中获取一个特定的行有人可以告诉我错误为什么一切正常但Listbox中没有显示任何项目？清除列表框的代码也不起作用...... 任何想法？

        string MyConString = "SERVER=" + ip + ";" + "DATABASE=" + db + ";" + "UID=" + user + ";" + "PASSWORD=" + pw + ";";
        MySqlConnection connection = new MySqlConnection(MyConString);
        string column = (string)comboBox1.SelectedValue;
        string query = "SELECT * from t_string;";

        List<string>[] list = new List<string>[1];
        list[0] = new List<string>();

        connection.Open();
        //Create Command
        MySqlCommand cmd = new MySqlCommand(query, connection);
        //Create a data reader and Execute the command
        MySqlDataReader dataReader = cmd.ExecuteReader();

        //Read the data and store them in the list
        while (dataReader.Read())
        {
            list[0].Add(dataReader[column] + "");
        }

        MessageBox.Show("Starting");
        Form1 form1 = new Form1();
        //Clear Listbox
        form1.listBox1.Items.Clear();
        // Add List to Textbox
        form1.listBox1.Items.AddRange(list);
        form1.listBox1.Refresh();
        MessageBox.Show("Finished");

        //close Data Reader
        dataReader.Close();

Answer 1

因为我不在这里发布一个问题，以获得任何其他人的答案而没有我自己的工作，我自己做了一个答案：P

我使用DataTable并使用Class来填充ComboBox和我的ID

            string MyConString = "SERVER=" + Config_Settings.ip + ";" + "DATABASE=" + Config_Settings.db + ";" + "UID=" + Config_Settings.user + ";" + "PASSWORD=" + Config_Settings.pw + ";";
            MySqlConnection connection = new MySqlConnection(MyConString);
            string command = "SHOW COLUMNS FROM t_string";
            MySqlDataAdapter da = new MySqlDataAdapter(command, connection);
            DataTable dt = new DataTable();
            da.Fill(dt);

            List<MyModel> models = new List<MyModel>();
            foreach (DataRow row in dt.Rows)
            {
                MyModel model = new MyModel
                {
                    Name = (string)row[0]
                };
                models.Add(model);
            }

            bindingSource1.DataSource = models;
            comboBox1.DataSource = bindingSource1.DataSource;
            comboBox1.DisplayMember = "Languae";
            comboBox1.ValueMember = "Languae";

和

    public class MyModel
    {
        public string Name { get; set; }
    }

C＃使用mysqllist填充列表框

1 个答案: