private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
List <string> city = new List <string>();
TblArea tblArea = this.comboBox1.SelectedItem as TblArea;
if (tblArea != null)
{
string sql = "SELECT AreaId,AreaName FROM TblArea WHERE AreaPId=@AreaPId";
SqlParameter parameters = new SqlParameter("@AreaPId", SqlDbType.Int)
{
Value = tblArea.AreaId
};
using (SqlDataReader reader = SqlHelper.ExecuteReader(sql, parameters))
{
if (reader.HasRows)
{
while (reader.Read())
{
city.Add(reader.GetString(1));
}
}
}
//数据绑定
this.comboBox2.DataSource = city;
}
}
private void Form1_Load(object sender, EventArgs e)
{
//using (SqlConnection sqlConn = new SqlConnection(conStr))
//{
List <TblArea> listArea = new List <TblArea>();
//先获取根节点
string sql = string.Format("SELECT AreaId,AreaName FROM TblArea WHERE AreaPId=@AreaPId");
//绑定参数
SqlParameter parameters = new SqlParameter()
{
ParameterName = "@AreaPId", Value = 0
};
using (SqlDataReader reader = SqlHelper.ExecuteReader(sql, parameters))
{
if (reader.HasRows)
{
while (reader.Read())
{
TblArea tblArea = new TblArea();
tblArea.AreaId = reader.GetInt32(0);
tblArea.AreaName = reader.GetString(1);
listArea.Add(tblArea);
}
}
}
//向treeview中添加节点
foreach (TblArea item in listArea)
{
TreeNode node = this.treeView1.Nodes.Add(item.AreaName);
node.Tag = item.AreaId;
LoadTreeView(item.AreaId, node.Nodes);
}
//using (SqlCommand sqlComm = new SqlCommand(sql, sqlConn))
//{
// sqlConn.Open();
// using (SqlDataReader reader = sqlComm.ExecuteReader())
// {
// if (reader.HasRows)
// {
// while (reader.Read())
// {
// TreeNode node = this.treeView1.Nodes.Add(reader.GetString(1));
// LoadTreeView(reader.GetInt32(0), node.Nodes);
// }
// }
// }
//}
//}
}
private void Form3_Load(object sender, EventArgs e)
{
List <TblArea> listArea = new List <TblArea>();
//Dictionary<int, string> listArea = new Dictionary<int, string>();
string sql = "SELECT AreaId,AreaName FROM TblArea WHERE AreaPId=@AreaPId";
SqlParameter parameters = new SqlParameter()
{
ParameterName = "@AreaPId", Value = 0
};
using (SqlDataReader reader = SqlHelper.ExecuteReader(sql, parameters))
{
if (reader.HasRows)
{
while (reader.Read())
{
TblArea area = new TblArea();
area.AreaId = reader.GetInt32(0);
area.AreaName = reader.GetString(1);
listArea.Add(area);
//listArea.Add(reader.GetInt32(0), reader.GetString(1));
}
}
}
//数据绑定
this.comboBox1.DisplayMember = "AreaIName";
this.comboBox2.ValueMember = "AreaId";
this.comboBox1.DataSource = listArea;
//foreach (KeyValuePair<int,string> item in listArea)
//{
// this.comboBox1.Items.Add(item.Value);
//}
}