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public class ProvinceItem
{
public int Id { get; set; }
public string Name { get; set; }
}
ProvinceItem item = new ProvinceItem();
item.Id = dataReader.GetInt32(dataReader.GetOrdinal("proID"));
item.Name = dataReader.GetString(dataReader.GetOrdinal("proName"));
cmbPro.Items.Add(item.Name);
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Configuration;
namespace 省市选择
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
string connStr = ConfigurationManager.ConnectionStrings["DbConn"].ConnectionString;
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
using (SqlCommand cmd = conn.CreateCommand())
{
cmd.CommandText = "select * from promary";
using (SqlDataReader dataReader = cmd.ExecuteReader())
{
while (dataReader.Read())
{
ProvinceItem item = new ProvinceItem();
item.Id = dataReader.GetInt32(dataReader.GetOrdinal("proID"));
item.Name = dataReader.GetString(dataReader.GetOrdinal("proName"));
cmbPro.Items.Add(item);
}
}
}
}
}
public void cmbPro_SelectedIndexChanged(object sender, EventArgs e)
{
cmbCity.Items.Clear();
ProvinceItem pitem = (ProvinceItem) cmbPro.SelectedItem;
string connStr = ConfigurationManager.ConnectionStrings["DbConn"].ConnectionString;
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
using (SqlCommand cmd = conn.CreateCommand())
{
cmd.CommandText = "select * from city where proID=@proID";
cmd.Parameters.Add(new SqlParameter("proID",pitem.Id));
using (SqlDataReader reader = cmd.ExecuteReader())
{
while (reader.Read())
{
string cityName = reader.GetString(reader.GetOrdinal("cityName"));
cmbCity.Items.Add(cityName);
}
}
}
}
}
public class ProvinceItem
{
public int Id { get; set; }
public string Name { get; set; }
}
}
}