AutoCompleteExtender 出错

我使用AutoCompleteExtender控件实现自动输入完成。可运行后IE提示JS错误

错误：Sys.ArgumentUndefinedException:Value cannot be undefined
Parameter name: type
代码：0

default.aspx



<body>

    <form id="form1" runat="server">

        

        <div>

        <asp:ScriptManager ID="ScriptManager1" runat="server" />

        <asp:TextBox ID="TextBox1" runat="server" AutoComplete="off"></asp:TextBox>

            <ajaxToolkit:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server" 

            TargetControlID="TextBox1" 

            ServiceMethod = "GetCompletionList" 

            ScriptPath="SpSelect.asmx" 

            MinimumPrefixLength="1" 

            CompletionSetCount="15"

             CompletionInterval="1000"

             EnableCaching="true"

             >

            </ajaxToolkit:AutoCompleteExtender>

            </div>

    </form>    

</body>

SpSelect.cs





using System;

using System.Web;

using System.Collections;

using System.Web.Services;

using System.Web.Services.Protocols;

using System.Data.OleDb;

using System.Collections.Generic; //List

using System.Data;

using System.Web.Script.Services;





/// <summary>

/// SpSelect 的摘要说明

/// </summary>

/// 

[ScriptService()]

[WebService(Namespace = "http://tempuri.org/")]

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

public class SpSelect : System.Web.Services.WebService {



    public SpSelect () {



        //如果使用设计的组件，请取消注释以下行 

        //InitializeComponent(); 

    }



    //自动输入完成

   

    [WebMethod]

    public string[] GetCompletionList(string prefixText,int count) {

        // 定义一个泛用集合对象 List 来储存建议词。

        List<string> suggestions = new List<string>();

        try

        {

            string sqlstr = "SELECT DISTINCT sp_mc FROM sp_gl WHERE sp_mc LIKE @prefixName ORDER BY 1";

            OleDbParameter[] parm = new OleDbParameter[1];

            parm[0] = new OleDbParameter("@prefixName", prefixText + "%");



            OleDbDataReader dr = DBOperation.ExecuteReader(DBOperation.CONN_STRING_NON_DTC, CommandType.Text, sqlstr, parm);



            while (dr.Read())

            {

                suggestions.Add(dr["sp_mc"].ToString());

            }

            return suggestions.ToArray();

        }

        catch (Exception ex)

        {

            suggestions.Add(ex.Message);

            return suggestions.ToArray();

        }

   



    }

    

}

--------------------编程问答-------------------- 难道没人用吗 --------------------编程问答-------------------- 楼主的AutoCompleteExtender版本是 3.5的还是2.0的 --------------------编程问答-------------------- 2.0 --------------------编程问答-------------------- 我的是3.5刚用了下正常,你设个断点,看看异常是在什么时候抛出的,是你后台代码已经执行返回了值就抛出异常还是,后台代码没有执行之前就抛异常了 --------------------编程问答-------------------- 我在public string[] GetCompletionList(string prefixText,int count) {
处设的断点。但是没走到这 --------------------编程问答-------------------- 我直接建的CTP项目。应该web.config不会有什么问题 --------------------编程问答-------------------- ？为什么所有的回复全变没了？ --------------------编程问答-------------------- 路过来看看 --------------------编程问答-------------------- web.config中加上
<httpHandlers>
        <remove verb="*" path="*.asmx"/>
        <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
        <add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
        <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false"/>
      </httpHandlers>
就可以了！

补充：.NET技术 ,  ASP.NET