这适用于在列表框中显示数据库中的项目,但我需要如果我在列表框中选择一个值,它会将有关该人员的信息显示回文本框。那是我无法工作的事情。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
namespace program
{
public partial class Form8 : Form
{
public Form8()
{
InitializeComponent();
fill_listbox();
}
void fill_listbox()
{
string constring = "datasource=sql2.freesqldatabase.com;port=3306;username=sql217040;password=xxxxx";
string Query = "select * from sql217040.fakedata ;";
MySqlConnection conDataBase = new MySqlConnection(constring);
MySqlCommand cmdDataBase = new MySqlCommand(Query, conDataBase);
MySqlDataReader myReader;
try
{
conDataBase.Open();
myReader = cmdDataBase.ExecuteReader();
while (myReader.Read())
{
string id1 = myReader.GetString("id");
string name1 = myReader.GetString("name");
string surname1 = myReader.GetString("surname");
listBox1.Items.Add(id1 + ' ' + name1 + ' ' + surname1);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
string constring = "datasource=sql2.freesqldatabase.com;port=3306;username=sql217040;password=xxxxx";
string Query = "select * from sql217040.fakedata where name='" + listBox1.Text + "' ;";
MySqlConnection conDataBase = new MySqlConnection(constring);
MySqlCommand cmdDataBase = new MySqlCommand(Query, conDataBase);
MySqlDataReader myReader;
try
{
conDataBase.Open();
myReader = cmdDataBase.ExecuteReader();
while (myReader.Read())
{
string sname = myReader.GetString("name");
string ssurname = myReader.GetString("surname");
string sphone = myReader.GetString("phone");
textBox1.Text = sname;
textBox2.Text = ssurname;
//telephone.Text = sphone;
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
}
答案 0 :(得分:0)
理想情况下,我会将您的列表框更改为datagridview,并像这样更改您的方法
void fill_listbox()
{
try
{
string constring = "datasource=sql2.freesqldatabase.com;port=3306;username=sql217040;password=xxxxx";
string Query = "select * from sql217040.fakedata ;";
using(MySqlConnection conDataBase = new MySqlConnection(constring))
{
conDataBase.Open();
using (SqlDataAdapter a = new SqlDataAdapter(Query, conDataBase))
{
DataTable t = new DataTable();
a.Fill(t);
// Render data onto the screen
dataGridView1.DataSource = t; // <-- datagridview1 is the gridview i have added
}
}
}
catch(Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
并从gridview的单元格双击事件中读取这样的值
private void dataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
{
string name = dataGridView1.Rows[e.RowIndex].Cells["columnname"].Value.ToString();
}
答案 1 :(得分:0)
为什么不使用DataSet而不是DataReader。
只需将所有项目添加到列表框中,然后通过listbox selectedItemIndex从DataSet中获取所选项目。当列表框选择的索引发生变化时,这将保存额外的查询。