aspx頁
<body>
<form id="form1" runat="server">
<div>
<table><tr><td>用戶名</td><td>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox></td></tr>
<tr><td>密碼</td><td>
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox></td></tr>
<tr><td>確認密碼</td><td>
<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox></td></tr>
<tr><td>郵箱</td><td>
<asp:TextBox ID="TextBox4" runat="server"></asp:TextBox></td></tr>
<tr><td>地址</td><td>
<asp:DropDownList ID="ddlprovince" runat="server" AutoPostBack="True"
onselectedindexchanged="ddlprovince_SelectedIndexChanged">
</asp:DropDownList>省
<asp:DropDownList ID="ddlcity" runat="server" AutoPostBack="True"
onselectedindexchanged="ddlcity_SelectedIndexChanged">
</asp:DropDownList>市
<asp:DropDownList ID="ddlarear" runat="server">
</asp:DropDownList>縣
</td></tr></table>
</div>
</form>
</body>
cs頁
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
namespace WebApplication1
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
LoadProvince();
}
}
private void LoadProvince()
{
BLL.province bpro = new BLL.province();
DataTable dt= bpro.GetList("").Tables[0];
ddlprovince.DataSource = dt;
ddlprovince.DataTextField = "provincename";
ddlprovince.DataValueField = "provinceID";
ddlprovince.DataBind();
}
protected void ddlprovince_SelectedIndexChanged(object sender, EventArgs e)
{
if (this.ddlarear.Items.Count>0)
{
this.ddlarear.Items.Clear();
}
BLL.city bcity = new BLL.city();
string proid = this.ddlprovince.SelectedItem.Value;
DataTable dt = bcity.GetList("father='"+proid+"'").Tables[0];
ddlcity.DataSource = dt;
ddlcity.DataTextField = "cityname";
ddlcity.DataValueField = "cityID";
ddlcity.DataBind();
//綁定默認顯示的市級區劃下面所有的縣
string cityid= dt.Rows[0]["cityID"].ToString();
BLL.area baraer = new BLL.area();
DataTable dtarea = baraer.GetList("father='" + cityid + "'").Tables[0];
ddlarear.DataSource = dtarea;
ddlarear.DataTextField = "areaname";
ddlarear.DataValueField = "areaID";
ddlarear.DataBind();
}
protected void ddlcity_SelectedIndexChanged(object sender, EventArgs e)
{
BLL.area baraer = new BLL.area();
string cityid = this.ddlcity.SelectedItem.Value;
DataTable dt = baraer.GetList("father='" + cityid + "'").Tables[0];
ddlarear.DataSource = dt;
ddlarear.DataTextField = "areaname";
ddlarear.DataValueField = "areaID";
ddlarear.DataBind();
}
}
}
Getlist方法
public DataSet GetList(string strWhere)
{
StringBuilder strSql=new StringBuilder();
strSql.Append("select id,provinceID,provincename ");
strSql.Append(" FROM province ");
if(strWhere.Trim()!="")
{
strSql.Append(" where "+strWhere);
}
return DbHelperSQL.Query(strSql.ToString());
}
Query方法：
public static DataSet Query(string SQLString)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
command.Fill(ds, "ds");
}
catch (System.Data.SqlClient.SqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}