第一次用这东西来个总结，下面贴一下码！自定义控件中...
注意数据源的绑定，
似乎都和webservice有关，发现有四种可能导致错误：
1、webservice中的方法参数签名必须是string knownCategoryValues, string category似乎不能修改。
2、[System.Web.Script.Services.ScriptService]必须在类前面。
3、webservice路径错误。
4、应用方法名错误。
5、注意数据源的绑定
method error 500，犯的没有贴上ParentControlID还有就是数据源的问题
//------------------------------源码如下：
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="Zone.ascx.cs" Inherits="UserControl_Zone" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<%@ Register Assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
Namespace="System.Web.UI" TagPrefix="asp" %>
<table>
<tr>
<td colspan="3" rowspan="1" style="width: 343px">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
</td>
</tr>
<tr>
<td colspan="3" rowspan="3" style="width: 343px">
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<table>
<tr>
<td style="width: 100px">
<asp:DropDownList ID="ddlProvince" runat="server" Width="100px">
</asp:DropDownList></td>
<td style="width: 100px">
<asp:DropDownList ID="ddlCity" runat="server" Width="100px">
</asp:DropDownList></td>
<td style="width: 150px">
<asp:DropDownList ID="ddlArea" runat="server" Width="100px">
</asp:DropDownList></td>
</tr>
</table>
<cc1:CascadingDropDown ID="cddProvince" runat="server" TargetControlID="ddlProvince" ServicePath="../ZoneWebServer.asmx" ServiceMethod="GetProvinceData" Category="Province" PromptText="请选择省份" LoadingText="省份加载中..">
</cc1:CascadingDropDown>
<cc1:CascadingDropDown ID="cddCity" runat="server" TargetControlID="ddlCity" ServicePath="../ZoneWebServer.asmx" ServiceMethod="GetCityData" Category="City" PromptText="请选择城市" LoadingText="城市加载中.." ParentControlID="ddlProvince">
</cc1:CascadingDropDown>
<cc1:CascadingDropDown ID="cddArea" runat="server" TargetControlID="ddlArea" ServicePath="../ZoneWebServer.asmx" ServiceMethod="GetAreaData" Category="Area" PromptText="请选择区县" LoadingText="区县加载中.." ParentControlID="ddlCity">
</cc1:CascadingDropDown>
</ContentTemplate>
</asp:UpdatePanel>
</td>
</tr>
<tr>
</tr>
<tr>
</tr>
</table>
//-----------------------.cs
-----------------------------
zonewebserver
-----------------------------
using System;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Data;
using System.Data.SqlClient;
using System.Web.Services.Protocols;
using System.Web.Script.Services;
using System.Collections.Generic;
using System.Collections.Specialized;
using AjaxControlToolkit;
/// <summary>
/// ZoneWebServer 的摘要说明
/// </summary>
[WebService(Namespace = "http://microsoft.com/webservices/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService]
public class ZoneWebServer : System.Web.Services.WebService {
public ZoneWebServer () {
//如果使用设计的组件，请取消注释以下行
//InitializeComponent();
}
/// <summary>
/// 获取省数据
/// </summary>
/// <param name="zone"></param>
/// <param name="zonecategory"></param>
/// <returns></returns>
[WebMethod]
public CascadingDropDownNameValue[] GetProvinceData(string knownCategoryValues, string category)
{
List<CascadingDropDownNameValue> ProvinceList = new List<CascadingDropDownNameValue>();
using(SqlConnection conn=new SqlConnection(SqlHelper.ConnectionStringLocalGS))
{
SqlParameter[] parm = new SqlParameter[] { };
SqlDataReader sdrProvince = SqlHelper.ExecuteReader(conn, CommandType.StoredProcedure, "showProvince", parm);
while(sdrProvince.Read())
{
ProvinceList.Add(new CascadingDropDownNameValue(sdrProvince["Province_Name"].ToString(),sdrProvince["Province_Tag"].ToString()));
}
return ProvinceList.ToArray();
}
}
/// <summary>
/// 获取市信息
/// </summary>
/// <param name="zone"></param>
/// <param name="zonecategory"></param>
/// <returns></returns>
///
[WebMethod]
public CascadingDropDownNameValue[] GetCityData(string knownCategoryValues, string category)
{
StringDictionary provincelist = CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);
List<CascadingDropDownNameValue> Citylist = new List<CascadingDropDownNameValue>();
using (SqlConnection conn = new SqlConnection(SqlHelper.ConnectionStringLocalGS))
{
SqlParameter[] parm = new SqlParameter[] {
new SqlParameter("@ProvinceID",SqlDbType.NVarChar,500)
};
parm[0].Value = provincelist["province"];
SqlDataReader sdrCity = SqlHelper.ExecuteReader(conn, CommandType.StoredProcedure, "showCity", parm);
while (sdrCity.Read())
{
Citylist.Add(new CascadingDropDownNameValue(sdrCity["City_Name"].ToString(), sdrCity["City_Tag"].ToString()));
}
return Citylist.ToArray();
}
}
/// <summary>
/// 获取区县
/// </summary>
/// <param name="zone"></param>
/// <param name="zonecategory"></param>
/// <returns></returns>
///
[WebMethod]
public CascadingDropDownNameValue[] GetAreaData(string knownCategoryValues, string category)
{
StringDictionary citylist = CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);
List<CascadingDropDownNameValue> Arealist = new List<CascadingDropDownNameValue>();
using(SqlConnection conn=new SqlConnection(SqlHelper.ConnectionStringLocalGS))
{
SqlParameter[] parm = new SqlParameter[] {
new SqlParameter("@CityID",SqlDbType.NVarChar)
};
parm[0].Value = citylist["City"];
SqlDataReader sdrArea = SqlHelper.ExecuteReader(conn,CommandType.StoredProcedure,"ShowArea",parm);
while(sdrArea.Read())
{
Arealist.Add(new CascadingDropDownNameValue(sdrArea["Area_Name"].ToString(),sdrArea["Area_ID"].ToString()));
}
return Arealist.ToArray();
}
}
}
---------------------
<%@ WebService Language="C#" CodeBehind="~/App_Code/ZoneWebServer.cs" Class="ZoneWebServer" %>
