前臺：

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

 <Services>              
                <asp:ServiceReference Path="~/WebService.asmx" />          
                 </Services>   

 

<div class="messquan">
        <div class="messzuo">企業(yè)名稱： </div>
        <div class="messyou">
                     <asp:TextBox ID="txtcomname" runat="server"  Width="309px"></asp:TextBox><asp:Label
                         ID="lblcomname" runat="server" Text="" Visible="false"></asp:Label>
                         <ajaxToolkit:AutoCompleteExtender ID="ac1" runat="server" TargetControlID="txtcomname" ServicePath="~/WebService.asmx" ServiceMethod="GetList" MinimumPrefixLength="1"></ajaxToolkit:AutoCompleteExtender>
                    <span style=" color:Red;"> <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txtcomname" ValidationGroup="group1" Display="Dynamic" Text="企業(yè)名稱不能為空" ErrorMessage="企業(yè)名稱不能為空"></asp:RequiredFieldValidator></span>
                                                                                           </div>
      </div>

 

后臺：/WebService.asmx

/// <summary>
///WebService 的摘要說明
/// </summary>
[WebService(Namespace = "http:///")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
//若要允許使用 ASP.NET AJAX 從腳本中調(diào)用此 Web 服務(wù),，請取消對下行的注釋,。
[System.Web.Script.Services.ScriptService]
public class WebService : System.Web.Services.WebService {

    public WebService () {

        //如果使用設(shè)計的組件,，請取消注釋以下行
        //InitializeComponent();
    }

    [WebMethod]
    public string[] GetData(string prefixText, int count)
    {
        string[] data = new string[10000];
        for (int i = 0; i < data.Length; i++)
            data[i] = i.ToString("0000");
        return data.Where(p => p.IndexOf(prefixText) >= 0).Take(count).ToArray();
    }

    [WebMethod]
    public string[] GetList(string prefixText, int count)
    {
     
        DataTable dt= CompanyBll.GetComByNamelike(prefixText,count);
        int countx = dt.Rows.Count;
        string[] retvalue = new string[countx];//需返回的數(shù)組
        try
        {
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                retvalue[i] = dt.Rows[i]["CompanyName"].ToString();
            }

        }
        catch
        {
            string str = "";

            for (int y = countx + 1; y <= count; y++)
            {
                retvalue[y - 1] = str;//用空值替代null
            }

        }
            return retvalue;
          
    }

 

   
}