AutoCompleteExtender webservices

///引入新的命名空间
using System.Data;
using System.Web.Script.Services;
using AjaxControlToolkit;
 

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
///添加脚本服务
[System.Web.Script.Services.ScriptService()]
public class AjaxService : System.Web.Services.WebService
{
 public static string[] autoCompleteFileList = null;
    public AjaxService ()
 {
       
    }

 [System.Web.Services.WebMethod()]
 [System.Web.Script.Services.ScriptMethod()]
 public string[] GetFileList(string prefixText,int count)
 {   ///检测参数是否为空
  if(string.IsNullOrEmpty(prefixText) == true || count <= 0) return null;
  if(autoCompleteFileList == null)
  { ///从数据库中获取所有文件的名称
            //FileImage file = new FileImage();
            //DataSet ds = file.GetFiles();
            DataTable table = SaleInfo.SearchHenlycode();
   if(table == null || table.Rows.Count <= 0) return null;
   ///将文件名称保存到临时数组中
            string[] tempFileList = new string[table.Rows.Count];
            for(int i = 0; i < table.Rows.Count; i++)
   {
              tempFileList[i]=table.Rows[i]["kp_henly_code"].ToString();
   }
   ///对数组进行排序
   Array.sort(tempFileList,new CaseInsensitiveComparer());
   autoCompleteFileList=tempFileList;
  }
  ///定位二叉树搜索的起点
  int index = Array.BinarySearch(autoCompleteFileList,prefixText,new CaseInsensitiveComparer());
  if(index < 0)
  {   ///修正起点
   index = ~index;
  }
  ///搜索符合条件的文件名称
  int matchCount = 0;
  for(matchCount = 0; matchCount < count && matchCount + index < autoCompleteFileList.Length; matchCount++)
  {   ///查看开头字符串相同的项
   if(autoCompleteFileList[index + matchCount].StartsWith(prefixText,StringComparison.CurrentCultureIgnoreCase) == false)
   {
    break;
   }
  }
  ///处理搜索结果
  string[] matchResultList = new string[matchCount];
  if(matchCount > 0)
  {   ///复制搜索结果
   Array.copy(autoCompleteFileList,index,matchResultList,matchCount);
  }  
  return matchResultList;
 }
}

  <ajaxToolkit:autocompleteextender ID="aceName" runat="server" TargetControlID="TextBox2" ServicePath="../SaleInfo/AjaxService.asmx"  ServiceMethod="GetFileList" MinimumPrefixLength="3" CompletionInterval="100" CompletionSetCount="20" ></ajaxToolkit:autocompleteextender>