AjaxToolkit初使用之坎坷经历(含全国省市区xml）

最新推荐文章于 2025-09-09 16:53:48 发布

转载最新推荐文章于 2025-09-09 16:53:48 发布 · 85 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/billmo/archive/2008/12/15/1355576.html

文章标签：

#xhtml #ui #c#

本文介绍了一个使用AjaxControlToolkit实现的三级联动菜单案例，并解决了在实施过程中遇到的“方法错误500”的问题。文章提供了完整的页面代码、后台逻辑及WebService实现方案。

前段时间一直在看老赵的ajax的webcast

今天正好说是要做一个三级联动的菜单，想到ajaxToolkit中有这么个东西

就把文档一开，开始写了

结果总是出现 “方法错误 500”

网上搜索之后，发现是web.config的问题

解决方法是创建一个基于ajax的项目。然后对比一下web.config

增加其中没有的内容

这么个问题搞了1个多小时

本以为简单易用的ajaxToolkit，要入门看来还是要个过程的

页面代码
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs"  EnableEventValidation="false" Inherits="AJAXEnabledWebApplication1._Default" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>
<!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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
       <ajaxToolkit:ToolkitScriptManager EnablePartialRendering="true" runat="server" ID="ScriptManager1" />
    <div class="demoarea">
        <div class="demoheading">CascadingDropDown Demonstration</div>
        <table>
            <tr>
                <td>省</td>
                <td><asp:DropDownList ID="DropDownList1" runat="server" Width="170" /></td>
            </tr>
            <tr>
                <td>市</td>
                <td><asp:DropDownList ID="DropDownList2" runat="server" Width="170" /></td>
            </tr>
            <tr>
                <td>区县</td>
                <td><asp:DropDownList ID="DropDownList3" runat="server" Width="170" AutoPostBack="true" OnSelectedIndexChanged="DropDownList3_SelectedIndexChanged" /></td>
            </tr>
        </table>
        <br />

        <ajaxToolkit:CascadingDropDown ID="CascadingDropDown1" runat="server" TargetControlID="DropDownList1"
            Category="province"  PromptText="请选择

" LoadingText="[Loading

]"
            ServicePath="WebServicePCD.asmx" ServiceMethod="GetproviceNames" />
        <ajaxToolkit:CascadingDropDown ID="CascadingDropDown2" runat="server" TargetControlID="DropDownList2"
            Category="city" ServicePath="WebServicePCD.asmx" PromptText="请选择

" LoadingText="[Loading

]"
            ServiceMethod="GetcityNames" ParentControlID="DropDownList1" />
        <ajaxToolkit:CascadingDropDown ID="CascadingDropDown3" runat="server" TargetControlID="DropDownList3"
            Category="country" PromptText="请选择

" LoadingText="[Loading

]"
            ServicePath="WebServicePCD.asmx" ServiceMethod="GetcountryNames"
            ParentControlID="DropDownList2" />

       <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional" RenderMode="inline">
            <ContentTemplate>
                <asp:Label ID="Label1" runat="server" Text="请选择

" />
            </ContentTemplate>
            <Triggers>
                <asp:AsyncPostBackTrigger ControlID="DropDownList3" EventName="SelectedIndexChanged" />
            </Triggers>
        </asp:UpdatePanel>
    </div>
    </form>
</body>
</html>

页面后台
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using AjaxControlToolkit;

namespace AJAXEnabledWebApplication1
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        protected void DropDownList3_SelectedIndexChanged(object sender, EventArgs e)
        {
            // Get selected values
            string make = DropDownList1.SelectedItem.Text;
            string model = DropDownList2.SelectedItem.Text;
            string color = DropDownList3.SelectedItem.Text;

            // Output result string based on which values are specified
            if (string.IsNullOrEmpty(make))
            {
                Label1.Text = "请选择省";
            }
            else if (string.IsNullOrEmpty(model))
            {
                Label1.Text = "请选择城市";
            }
            else if (string.IsNullOrEmpty(color))
            {
                Label1.Text = "请选择区县";
            }
            else
            {
                Label1.Text = string.Format("您选择了 {0} {1} {2}. !", model,make,color );
            }
        }
    }
}

WebService
using System;
using System.Data;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.ComponentModel;
using System.Xml;
using AjaxControlToolkit;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Web.Script.Services;
namespace AJAXEnabledWebApplication1
{
    /// <summary>
    /// WebServicePCD 的摘要说明
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [ToolboxItem(false)]
    [System.Web.Script.Services.ScriptService]
    public class WebServicePCD : System.Web.Services.WebService
    {

        // Member variables
        private static XmlDocument _document;
        private static object _lock = new object();

        // we make these public statics just so we can call them from externally for the
        // page method call
        public static XmlDocument Document
        {
            get
            {
                lock (_lock)
                {
                    if (_document == null)
                    {
                        // Read XML data from disk
                        _document = new XmlDocument();
                        _document.Load(HttpContext.Current.Server.MapPath("Address.xml"));
                    }
                }
                return _document;
            }
        }
        public static string[] Hierarchy
        {
            get { return new string[] { "province", "city" }; }
        }

        /// <summary>
        /// Constructor to initialize members
        /// </summary>
        public WebServicePCD()
        {
        }

        /// <summary>
        /// Helper web service method
        /// </summary>
        /// <param name="knownCategoryValues">private storage format string</param>
        /// <param name="category">category of DropDownList to populate</param>
        /// <returns>list of content items</returns>
        [WebMethod]
        public AjaxControlToolkit.CascadingDropDownNameValue[] GetDropDownContents(string knownCategoryValues, string category)
        {
            // Get a dictionary of known category/value pairs
            StringDictionary knownCategoryValuesDictionary = AjaxControlToolkit.CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);

            // Perform a simple query against the data document
            return AjaxControlToolkit.CascadingDropDown.QuerySimpleCascadingDropDownDocument(Document, Hierarchy, knownCategoryValuesDictionary, category);
        }

        [WebMethod]
        public static CascadingDropDownNameValue[] GetDropDownContentsPageMethod(string knownCategoryValues, string category)
        {
            return new WebServicePCD().GetDropDownContents(knownCategoryValues, category);
        }

        [WebMethod]
        public CascadingDropDownNameValue[] GetproviceNames(string knownCategoryValues, string category)
        {
            StringDictionary knownCategoryValuesDictionary = AjaxControlToolkit.CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);
            XmlNodeList xnl =Document.SelectNodes("//province/@name");
            List<CascadingDropDownNameValue> value = new List<CascadingDropDownNameValue>();
            foreach (XmlNode xn in xnl)
            {
                value.Add(new CascadingDropDownNameValue(xn.Value,xn.Value));
            }
            return value.ToArray();
        }

        [WebMethod]
        public CascadingDropDownNameValue[] GetcityNames(string knownCategoryValues, string category)
        {
            StringDictionary kcv = AjaxControlToolkit.CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);
            if (!kcv.ContainsKey("province"))
            {
                return null;
            }
            XmlNodeList xnl = Document.SelectNodes("//province[@name=\"" + kcv["province"] + "\"]/*/@name");
            List<CascadingDropDownNameValue> value = new List<CascadingDropDownNameValue>();
            foreach (XmlNode xn in xnl)
            {
                value.Add(new CascadingDropDownNameValue(xn.Value, xn.Value));
            }
            return value.ToArray();
        }

        [WebMethod]
        public CascadingDropDownNameValue[] GetcountryNames(string knownCategoryValues, string category)
        {
            StringDictionary kcv = AjaxControlToolkit.CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);
            if (!kcv.ContainsKey("city"))
            {
                return null;
            }
            XmlNodeList xnl = Document.SelectNodes("//city[@name=\"" + kcv["city"] + "\"]/*/@name");
            List<CascadingDropDownNameValue> value = new List<CascadingDropDownNameValue>();
            foreach (XmlNode xn in xnl)
            {
                value.Add(new CascadingDropDownNameValue(xn.Value, xn.Value));
            }
            return value.ToArray();
        }
    }
}

下面再传一个这个三级联动菜单的全国省市区的xml

http://files.cnblogs.com/billmo/Address.rar

转载于:https://www.cnblogs.com/billmo/archive/2008/12/15/1355576.html