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 );
}
}
}
}
WebServiceusing 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
https://files.cnblogs.com/billmo/Address.rar
