全国省市县三级联动（数据完整版）

网页前台代码：

<% @ Page Language = " C# "  AutoEventWireup = " true "   CodeFile = " Default.aspx.cs "  Inherits = " _Default "   EnableEventValidation = " false " %>

<% @ Register assembly = " AjaxControlToolkit "  namespace = " AjaxControlToolkit "  tagprefix = " cc1 "  %>

<! DOCTYPE html PUBLIC  " -//W3C//DTD XHTML 1.0 Transitional//EN "  " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd " >

< html xmlns = " http://www.w3.org/1999/xhtml " >
< head runat = " server " >
     < title > 无标题页 </ title >
</ head >
< body >
     < form id = " form1 "  runat = " server " >
     < div align = " center " >
         < asp:ScriptManager ID = " ScriptManager1 "  runat = " server " >
         </ asp:ScriptManager >
     < fieldset  >
     < legend > 全国省市县 </ legend >
     < fieldset style = " width: 265px " >
     < legend > 省 </ legend >
                     < asp:DropDownList ID = " DropDownList1 "  runat = " server "  
            AutoPostBack = " True " >
                     </ asp:DropDownList >
                     < cc1:CascadingDropDown ID = " DropDownList1_CascadingDropDown "  runat = " server "  
                        Category = " provice "  Enabled = " True "  LoadingText = " 读取数据中 .. "  PromptText = " 请选择省 "  
                        TargetControlID = " DropDownList1 "  ServicePath = " WebService.asmx "  ServiceMethod = " GetproviceNames " >
                     </ cc1:CascadingDropDown >
     </ fieldset >
         < fieldset style = " width: 266px " >
     < legend > 市 </ legend >
                     < asp:DropDownList ID = " DropDownList2 "  runat = " server "  AutoPostBack = " True " >
                     </ asp:DropDownList >
                     < cc1:CascadingDropDown ID = " DropDownList2_CascadingDropDown "  runat = " server "  
                        Category = " city "  Enabled = " True "  TargetControlID = " DropDownList2 "  LoadingText = " 读取数据中 .. "  PromptText = " 请选择市 "  ParentControlID = " DropDownList1 "
                          ServicePath = " WebService.asmx "  ServiceMethod = " GetCityNames " >
                     </ cc1:CascadingDropDown >
     </ fieldset >
             < fieldset style = " width: 266px " >
     < legend > 县 </ legend >
                 < asp:DropDownList ID = " DropDownList3 "  runat = " server " >
                 </ asp:DropDownList >
                 < cc1:CascadingDropDown ID = " DropDownList3_CascadingDropDown "  runat = " server "   Category = " District "  TargetControlID = " DropDownList3 "
                    Enabled = " True "  LoadingText = " 读取数据中 .. "  ParentControlID = " DropDownList2 "
                    ServicePath = " WebService.asmx "  ServiceMethod = " GetDistrictNames " >
                 </ cc1:CascadingDropDown >
     </ fieldset >
  </ fieldset >

     </ div >
     </ form >
</ body >
</ html >

WebService代码

using  System;
using  System.Collections;
using  System.Linq;
using  System.Web;
using  System.Web.Services;
using  System.Web.Services.Protocols;
using  System.Xml.Linq;

// 访问数据库命名空间
using  System.Data;
using  System.Data.SqlClient;

// 访问web.config命名空间
using  System.Web.Configuration;

// 导入ScriptServiceAttribute类的命名空间
using  System.Web.Script.Services;

// 返回CascadingDropDownNameValue数组所需的命名空间
using  AjaxControlToolkit;
using  System.Collections.Generic;
using  System.Collections.Specialized;

/// <summary>
///WebService 的摘要说明
/// </summary>
[WebService(Namespace  =  " http://tempuri.org/ " )]
[WebServiceBinding(ConformsTo  =  WsiProfiles.BasicProfile1_1)]
// 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。 
[System.Web.Script.Services.ScriptService]
public  class  WebService : System.Web.Services.WebService
{

    public WebService()
    {

        //如果使用设计的组件，请取消注释以下行 
        //InitializeComponent(); 
    }

    [WebMethod]
    public CascadingDropDownNameValue[] GetproviceNames(string knownCategoryValues, string category)
    {
        List<CascadingDropDownNameValue> values = new List<CascadingDropDownNameValue>();
        SqlConnection conn = new SqlConnection(WebConfigurationManager.ConnectionStrings["Personal"].ConnectionString);
        SqlCommand comm = conn.CreateCommand();
        comm.CommandText = "select [ProvinceID],[ProvinceName] from [S_Province] order by 1";
        conn.Open();
        try
        {
            SqlDataReader dr = comm.ExecuteReader();
            while (dr.Read())
            {
                values.Add(new CascadingDropDownNameValue(dr[1].ToString(), dr[0].ToString()));
            }
            return values.ToArray();
        }
        finally
        {
            conn.Close();
        }
    }
    [WebMethod]
    public CascadingDropDownNameValue[] GetCityNames(string knownCategoryValues, string category)
    {
        StringDictionary kcv = CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);
        if (!kcv.ContainsKey("provice"))
        {
            return null;
        }
        List<CascadingDropDownNameValue> values = new List<CascadingDropDownNameValue>();
        SqlConnection conn = new SqlConnection(WebConfigurationManager.ConnectionStrings["Personal"].ConnectionString);
        SqlCommand comm = conn.CreateCommand();
        comm.CommandText = "select [CityID],[CityName] from [S_City] where [ProvinceID]=@ProvinceID order by 1";
        comm.Parameters.Add("@ProvinceID", SqlDbType.Int).Value = kcv["provice"];
        conn.Open();
        try
        {
            SqlDataReader dr = comm.ExecuteReader();
            while (dr.Read())
            {
                values.Add(new CascadingDropDownNameValue(dr[1].ToString(), dr[0].ToString()));
            }
            return values.ToArray();
        }
        finally
        {
            conn.Close();
        }
    }
    [WebMethod]
    public CascadingDropDownNameValue[] GetDistrictNames(string knownCategoryValues, string category)
    {
        StringDictionary kcv = CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);
        if (!kcv.ContainsKey("city"))
        {
            return null;
        }
        List<CascadingDropDownNameValue> values = new List<CascadingDropDownNameValue>();
        SqlConnection conn = new SqlConnection(WebConfigurationManager.ConnectionStrings["Personal"].ConnectionString);
        SqlCommand comm = conn.CreateCommand();
        comm.CommandText = "select [DistrictID],[DistrictName] from [S_District] where [CityID]=@CityID order by 1";
        comm.Parameters.Add("@CityID", SqlDbType.Int).Value = kcv["city"];
        conn.Open();
        try
        {
            SqlDataReader dr = comm.ExecuteReader();
            while (dr.Read())
            {
                values.Add(new CascadingDropDownNameValue(dr[1].ToString(), dr[0].ToString()));
            }
            return values.ToArray();
        }
        finally
        {
            conn.Close();
        }
    }
}

 

数据库脚本下载地址： http://files.cnblogs.com/yechensi/PCD_AllData_V1.rar