测试AutoComplete.asmx 有数据，在页面上没有出现自动提示信息

html:
<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<%@ Register Assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
    Namespace="System.Web.UI" TagPrefix="asp" %>
<%@ 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 id="Head1" runat="server">
    <title>Ajax AutoComplete</title>
    <style type="text/css">
    .autocomplete_completionListElement
{
visibility : hidden;
margin : 0px!important;
background-color : inherit;
color : windowtext;
border : buttonshadow;
border-width : 1px;
border-style : solid;
cursor : 'default';
overflow : auto;
height : 200px;
    text-align : left;
    list-style-type : none;
}

/* AutoComplete highlighted item */

.autocomplete_highlightedListItem
{
background-color: #ffff99;
color: black;
padding: 1px;
}

/* AutoComplete item */

.autocomplete_listItem
{
background-color : window;
color : windowtext;
padding : 1px;
}
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>

        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
    </div>
    <asp:TextBox ID="TextBox1" runat="server" Width="250px" ></asp:TextBox>
    <ajaxToolkit:AutoCompleteExtender
                runat="server"
                BehaviorID="AutoCompleteEx"
                ID="autoComplete1"
                TargetControlID="TextBox1"
                ServicePath="AutoComplete.asmx"
                ServiceMethod="GetCompletionList"
                MinimumPrefixLength="1"
                EnableCaching="true"
                CompletionSetCount="20"
                CompletionListCssClass="autocomplete_completionListElement"
                CompletionListItemCssClass="autocomplete_listItem"
                CompletionListHighlightedItemCssClass="autocomplete_highlightedListItem"
                >
                <Animations>
                    <OnShow>
                        <Sequence>
                            <%-- Make the completion list transparent and then show it --%>
                            <OpacityAction Opacity="0" />
                            <HideAction Visible="true" />

                            <%--Cache the original size of the completion list the first time
                                the animation is played and then set it to zero --%>
                            <ScriptAction Script="
                                // Cache the size and setup the initial size
                                var behavior = $find('AutoCompleteEx');
                                if (!behavior._height) {
                                    var target = behavior.get_completionList();
                                    behavior._height = target.offsetHeight - 2;
                                    target.style.height = '0px';
                                }" />

                            <%-- Expand from 0px to the appropriate size while fading in --%>
                            <Parallel Duration=".4">
                                <FadeIn />
                                <Length PropertyKey="height" StartValue="0" EndValueScript="$find('AutoCompleteEx')._height" />
                            </Parallel>
                        </Sequence>
                    </OnShow>
                    <OnHide>
                        <%-- Collapse down to 0px and fade out --%>
                        <Parallel Duration=".4">
                            <FadeOut />
                            <Length PropertyKey="height" StartValueScript="$find('AutoCompleteEx')._height" EndValue="0" />
                        </Parallel>
                    </OnHide>
                </Animations>
            </ajaxToolkit:AutoCompleteExtender>
    </form>
</body>
</html>

AutoComplete.asmx

using System;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Collections.Generic;

/// <summary>
/// AutoComplete 的摘要说明
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class AutoComplete : System.Web.Services.WebService {

    public AutoComplete () {

        //如果使用设计的组件，请取消注释以下行
        //InitializeComponent();
    }

    [WebMethod]
    public string[] GetCompletionList(string prefixText)
    {
        SqlConnection _sqlConnection = new SqlConnection("server=localhost;database=ce;uid=sa;pwd=sa");
        SqlDataAdapter da = new SqlDataAdapter("select Words FROM AutoComplete where Words like '" + prefixText + "%'", _sqlConnection);
        DataSet ds = new DataSet();
        _sqlConnection.Open();
        da.Fill(ds);
        _sqlConnection.Close();

        List<string> items = new List<string>();
        foreach (DataRow dr in ds.Tables[0].Rows)
        {
            items.Add(dr["Words"].ToString());
        }
        return items.ToArray();
    }
}

--------------------编程问答--------------------



<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>  

   

 <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>  

   

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">  

 <html xmlns="http://www.w3.org/1999/xhtml">  

 <head runat="server">  

     <title>AJAX控件之AutoComplete</title>  

 </head>  

 <body style="text-align: center">  

    <form id="form1" runat="server">  

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

         <div>  

             <asp:TextBox ID="MyAuto" runat="server" Width="191px"></asp:TextBox><br />  

             <br />  

             <cc1:AutoCompleteExtender ID="ace" runat="server" CompletionInterval="100" MinimumPrefixLength="1"  

                 ServiceMethod="GetCompletionList" ServicePath="WebService.asmx" TargetControlID="MyAuto">  

             </cc1:AutoCompleteExtender>  

              </div>  

     </form>  

</body>  

</html>

using System;

using System.Web;

using System.Collections.Generic;

using System.Web.Services;

using System.Web.Services.Protocols;

using System.Data.SqlClient;

using System.Data;





/// <summary>  

/// WebService 的摘要说明  

/// </summary>  

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

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

//用以调用Web Service方法签名  

[System.Web.Script.Services.ScriptService]

public class WebService : System.Web.Services.WebService

{



    public WebService() { }



    [WebMethod]

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

    {



        DataTable dt = new DataTable();

        dt = ReturnDataTable("select Words FROM AutoComplete where Words like '" + prefixText + "%'");

        List<string> items = new List<string>(count);

        for (int i = 0; i < dt.Rows.Count; i++)

        {

            items.Add(dt.Rows[i][0].ToString());

        }



        return items.ToArray();

    }

    public static DataTable ReturnDataTable(string cmdtext)

    {

        SqlConnection cn = new SqlConnection();

        cn.ConnectionString = "server=localhost;database=ce;uid=sa;pwd=sa";

        DataTable dt = new DataTable();

        SqlCommand cmd = new SqlCommand();

        cmd = new SqlCommand(cmdtext, cn);

        cmd.CommandType = CommandType.Text; ;

        SqlDataReader dr = null;

        using (dr = cmd.ExecuteReader(CommandBehavior.CloseConnection))

        {

            dt.Load(dr);

        }

        return dt;

    }



}

--------------------编程问答-------------------- 怎么显示的下拉列表连接在一起了啊! --------------------编程问答-------------------- 参考实例：
http://www.cnblogs.com/insus/archive/2011/07/16/2108172.html

补充：.NET技术 ,  ASP.NET

测试AutoComplete.asmx 有数据 ，在页面上没有出现自动提示信息

测试AutoComplete.asmx 有数据，在页面上没有出现自动提示信息