- 小弟在博客园驻园不久，初来咋到；将最近写的小程序附上，希望各位大牛们吐槽；激发对程序员围观的童鞋们，赶紧加入IT行业，如果你在上海那简称就是SHIT，哈哈题外话，以下开始切入正题：
坐公交车是旁边偶遇一小朋友，对我天朝区域不甚了解，为了偶的下一代不走回头路，激发爱国热情，故写下以下代码：
需求：
- 读取本地数据库（文本、Access）;
- 根据省、市、县数据库切换，显示子级、父级；
以下是成形图：
实现步骤：
- 编写SqlHelper类（主要解决查询操作），代码如下
private static readonly string accessConn = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + Directory.GetCurrentDirectory() + (@"\Areafull.accdb");
/// <summary>
/// 查询access数据，返回table
/// </summary>
/// <param name="sql">执行sql</param>
/// <param name="parameters">查询参数</param>
/// <returns></returns>
public static DataTable ExecuteAccessDateTable(string sql, params SqlParameter[] parameters)
{
using (OleDbConnection cnn = new OleDbConnection(accessConn))
{
cnn.Open();
using (OleDbCommand cmd = cnn.CreateCommand())
{
cmd.CommandText = sql;
cmd.Parameters.AddRange(parameters);
OleDbDataReader apter = cmd.ExecuteReader();
DataTable dt = new DataTable();
dt.Load(apter);
return dt;
}
}
}
2.界面设计
三个ListBox控件分别放入，省，市，县
/// <summary>
/// 初始化加载省数据
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Window_Loaded(object sender, RoutedEventArgs e)
{
DataTable table = SqlHelper.ExecuteAccessDateTable("select * from areafull where AreaPid='0'");
SlB.ItemsSource = GetAreas(table);//省份绑定
} /// <summary>
/// 省数据选择
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void SlB_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
Area areaRow = (Area)SlB.SelectedItem;
DataTable table = SqlHelper.ExecuteDateTable("select * from areafull where AreaPid=@AreaPid", new SqlParameter("@AreaPid", areaRow.AreaId));
SJBX.ItemsSource = GetAreas(table);
} /// <summary>
/// 市级数据选择
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void SJBX_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (SJBX.SelectedItem != null)
{
Area areaRow = (Area)SJBX.SelectedItem;
DataTable table = SqlHelper.ExecuteDateTable("select * from areafull where AreaPid=@AreaPid", new SqlParameter("@AreaPid", areaRow.AreaId));
XJBX.ItemsSource = GetAreas(table);
}
else
{
XJBX.ItemsSource = null;
}
} /// <summary>
/// 数据转换对象
/// </summary>
/// <param name="table"></param>
/// <returns></returns>
private List<Area> GetAreas(DataTable table)
{
List<Area> lst = new List<Area>();
foreach (DataRow item in table.Rows)
{
Area are = new Area();
are.AreaId = Convert.ToInt32(item["Areaid"]);
are.AreaName = item["AreaName"].ToString();
are.AreaPid = Convert.ToInt32(item["AreaPid"]);
lst.Add(are);
}
return lst;
}
总结：
- 程序中主要用到数据转换对象的思想（Data——》Object）;
- Ato.net本身提供的数据访问类；
需要数据库及源码的直接回复我
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