前台调用WebServices的方法

当在解决方案/项目下新建WebServices时，会在AppCode文件夹内生成相对应的.cs类

一. 在.cs文件中写方法:
  首先要将 [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] 由注视状态释放掉。
   目的：  //若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。

  写一个要使用的方法
[WebMethod]
    //按不同的方式搜索书籍
    public string[] GetSearchType(string prefixText,int count,string contextKey)
    {
        sqlConnection conn = new sqlConnection("server=.;database=DB2DB;uid=sa;pwd=");
        string sqlStr = "";
        string key = "";
        switch (contextKey)
        {
            case "0":
                key = "Book_Name";
                sqlStr = "select top " + count + " Book_Name from Books where Book_Name like '%" + prefixText + "%'";
                break;
            case "1":
                key = "Book_Author";
                sqlStr = "select top " + count + " Book_Author from Books where Book_Author like '%" + prefixText + "%'";
                break;
            case "2":
                key = "Book_Publicationda";  //按出版日期
                sqlStr = "select top " + count + " Book_Publicationda from Books where Book_Publicationda like '%" + prefixText + "%'";
                break;
            case "3":
                key = "PublishName";  //按出版社
                sqlStr = "select top " + count + " PublishName from Books where PublishName like '%" + prefixText + "%'";
                break;
        }
        sqlCommand cmd = new sqlCommand(sqlStr,conn);
        sqlDataAdapter sda = new sqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        sda.Fill(ds);

        int resultCount = ds.Tables[0].Rows.Count;
        string[] resultValue = new String[resultCount];
        for (int i = 0; i < resultCount; i++)
        {
            string keywords =(string)(ds.Tables[0].Rows[i][key]);
            resultValue[i] = keywords;
        }
        return resultValue;
    }

二.前台代码：  <td style="PaDDING-LEFT: 3px" width="20">                    <asp:TextBox ID="key" runat="server" Text="" ></asp:TextBox>                                       <Toolkit:TextBoxWatermarkExtender ID="TextBoxWatermarkExtender1" runat="server" TargetControlID="key" WatermarkText="请输入关键字">                    </Toolkit:TextBoxWatermarkExtender>                                        <Toolkit:autocompleteextender ID="autocompleteextender1" runat="server"                    TargetControlID="key" ServicePath="~/WebServices/Booksearch.asmx"                     ServiceMethod="GetSearchType" MinimumPrefixLength="1" UseContextKey="true" ContextKey="0">                    </Toolkit:autocompleteextender>         </td>