用web service 实现连动

ProductsService.asmx

using  System;
using  System.Collections;
using  System.ComponentModel;
using  System.Data;
using  System.Diagnostics;
using  System.Web;
using  System.Web.Services;
using  System.Data.SqlClient ;


namespace  WebService
{
    /**//// <summary>
    /// ProductsService 的摘要说明。
    /// </summary>
    public class ProductsService : System.Web.Services.WebService
    {
        public ProductsService()
        {
            //CODEGEN: 该调用是 ASP.NET Web 服务设计器所必需的
            InitializeComponent();
        }

        组件设计器生成的代码#region 组件设计器生成的代码
        
        //Web 服务设计器所必需的
        private IContainer components = null;
                
        /**//// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
        }

        /**//// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if(disposing && components != null)
            {
                components.Dispose();
            }
            base.Dispose(disposing);        
        }
        
        #endregion

        // WEB 服务示例
        // HelloWorld() 示例服务返回字符串 Hello World
        // 若要生成，请取消注释下列行，然后保存并生成项目
        // 若要测试此 Web 服务，请按 F5 键

        [WebMethod] 
        public string[] GetCategories() 
        {
            string strSelect;
            SqlConnection conNorthwind;
            SqlCommand cmdCategories;
            SqlDataReader dtrCategories;
            ArrayList colCategories;
        
            strSelect = "SELECT CategoryName FROM Categories";
            conNorthwind = new SqlConnection( "server=(local);database=Northwind;uid=sa;pwd=" );
            cmdCategories = new SqlCommand( strSelect, conNorthwind );
            conNorthwind.Open();
            dtrCategories = cmdCategories.ExecuteReader();
            colCategories = new ArrayList();
            while (dtrCategories.Read())

            colCategories.Add( dtrCategories["CategoryName"] );
            conNorthwind.Close();
            return (string[])colCategories.ToArray( typeof( System.String ) ); 
        }



            [WebMethod] 
            public string[] GetProducts(string CategoryName) 
            {
                string strSelect;
                SqlConnection conNorthwind;
                SqlCommand cmdProducts;
                SqlDataReader dtrProducts;
                ArrayList colProducts;
        
                CategoryName = Server.UrlDecode( CategoryName );

                strSelect = "SELECT ProductName, UnitPrice " +
                    "FROM Products, Categories WHERE Products.CategoryID = Categories.CategoryID " +
                    "AND CategoryName = @CategoryName";

                conNorthwind = new SqlConnection(  "server=(local);database=Northwind;uid=sa;pwd=");
                cmdProducts = new SqlCommand( strSelect, conNorthwind );
                cmdProducts.Parameters.Add( new SqlParameter( "@CategoryName", CategoryName ) );
                conNorthwind.Open();
                dtrProducts = cmdProducts.ExecuteReader();
                colProducts = new ArrayList();
                while (dtrProducts.Read()) 
                {
                    colProducts.Add(
                        dtrProducts["ProductName"] + 
                        String.Format( " - {0:c}", dtrProducts["UnitPrice"] ) 
                        );
                }
                conNorthwind.Close();
                return (string[])colProducts.ToArray( typeof( System.String ) ); 
            }
        }
    }

调用页面  


 

<% @ Page language="c#" Codebehind="WebForm2.aspx.cs" AutoEventWireup="false" Inherits="WebService.WebForm2"  %>
<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"  >
< HTML >
     < HEAD >
         < title > WebForm2 </ title >
         < meta  name ="GENERATOR"  Content ="Microsoft Visual Studio .NET 7.1" >
         < meta  name ="CODE_LANGUAGE"  Content ="C#" >
         < meta  name ="vs_defaultClientScript"  content ="JavaScript" >
         < meta  name ="vs_targetSchema"  content ="http://schemas.microsoft.com/intellisense/ie5" >
         < SCRIPT  language ="JavaScript" >

var intCallID = 0;

function Init()
{
  Service.useService("ProductsService.asmx?WSDL","ProductsService");
  intCallID = Service.ProductsService.callService( Categories_Result, "GetCategories" );
}


function Categories_Result( result )
{
  var Categories = new Array();

  Categories = result.value;
  for (var intCounter = 0;intCounter < Categories.length;intCounter++ )
  {
    var optOption = new Option( Categories[ intCounter ] );
    frmProducts.dropCategories.options[ frmProducts.dropCategories.options.length ] = optOption;
  }
}

function Categories_Change( newCategory )
{
  var CategoryName = "";
  CategoryName = newCategory.options[ newCategory.selectedIndex ].text;
  lblCategory.innerText = CategoryName;
  intCallID = Service.ProductsService.callService( Products_Result, "GetProducts", CategoryName );
}


function Products_Result( result )
{
  var Products = new Array();

  Products = result.value;
  frmProducts.lstProducts.options.length = 0;

  for (var intCounter = 0;intCounter < Products.length;intCounter++ )
  {
    var optOption = new Option( Products[ intCounter ] );
    frmProducts.lstProducts.options[ frmProducts.lstProducts.options.length ] = optOption;
  }
 // frmProducts.lstProducts.style.display = "block";   
}


         </ SCRIPT >
     </ HEAD >
     < body  onload ="Init()" >
         < div  id ="Service"  style ="BEHAVIOR:url(webservice.htc)" ></ div >
         < form  id ="frmProducts" >
             < select  name ="dropCategories"  onchange ="Categories_Change(this)" >
                 < option  selected > Select Product Category </ option >
             </ select >
             < p >
                 < span  id ="lblCategory" ></ span >
                 < br >
                 < select  name ="lstProducts" >
                     < option  selected ></ option >
                 </ select >
         </ form >
         </ P >
     </ body >
</ HTML >

 
demo
 
http://files.cnblogs.com/gwazy/WebService.rar