中财网小型雕刻:级联下拉菜单CascadingDropDown(调用web service)示例
来源：百度文库 编辑：中财网 时间：2024/05/06 17:32:48
第一个ddl未选择时第二个ddl不可用
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="cascadingDropDown.aspx.cs" Inherits="cascadingDropDown" EnableEventValidation="false" %>
+++++++++CS代码++++++++++++++
protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
{
TextBox1.Text = DropDownList2.SelectedValue;
}
++++++++++zipCode.cs++++++++++++++++++++++++++
using System;
using System.Collections;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Da
using System.Web.Configuration;
using System.Collections.Generic;
using AjaxControlToolkit;
using System.Collections.Specialized;
using System.Da
///
///zipCode 的摘要说明
///
[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 zipCode : System.Web.Services.WebService
{
public zipCode()
{
//如果使用设计的组件，请取消注释以下行
//InitializeComponent();
}
// 此 Web 服务方法用来获取县市名称。
[WebMethod(Description = "获取县市名称")]
public CascadingDropDownNameValue[] GetCityNames(
string knownCategoryValues, string category)
{// 声明 CascadingDropDownNameValue 阵列。
List
new List
using (SqlConnection cn = new SqlConnection(WebConfigurationManager.
ConnectionStrings["chtNorthwind"].ConnectionString))
{
using (SqlCommand SQLCmd = cn.CreateCommand())
{
SQLCmd.CommandText = "SELECT 县市名称, 县市代号 FROM 县市 ORDER BY 2";
cn.Open();
using (SqlDataReader dr = SQLCmd.ExecuteReader())
{
while (dr.Read())
{
values.Add(new CascadingDropDownNameValue(
dr[0].ToString(), dr[1].ToString()));
}
}
}
}
return values.ToArray();
}
// 此 Web 服务方法用来获取乡镇区市。
[WebMethod(Description = "获取乡镇区市")]
public CascadingDropDownNameValue[] GetSubAreaByCityID(
string knownCategoryValues, string category)
{
StringDictionary kcv = CascadingDropDown.
ParseKnownCategoryValuesString(knownCategoryValues);
// 是否包含 City 的值。
if (!kcv.ContainsKey("City"))
return null;
// 声明 CascadingDropDownNameValue 阵列。
List
new List
using (SqlConnection cn = new SqlConnection(WebConfigurationManager.
ConnectionStrings["chtNorthwind"].ConnectionString))
{
using (SqlCommand SQLCmd = cn.CreateCommand())
{
SQLCmd.CommandText ="SELECT 乡镇区市名称, 邮政编码 FROM 乡镇区市 " +
" WHERE 县市代号 = @CityID " +
" ORDER BY 1";
SQLCmd.Parameters.Add("@CityID", SqlDbType.Int).Value = kcv["City"];
cn.Open();
using (SqlDataReader dr = SQLCmd.ExecuteReader())
{
while (dr.Read())
{
values.Add(new CascadingDropDownNameValue(dr[0].ToString(), dr[1].ToString()));
}
}
}
}
return values.ToArray();
}
}