flex调用webservice中的自定义类

public class ReturnResult    {        public int curIndex { get; set; }        public DataTable idxList { get; set; }    }    //测试数据库连接    [WebMethod(Description = "！！！测试数据库连接,链接字符串在web.config中")]    public bool conectDB()    {        strCon = ConfigurationSettings.AppSettings["sqlConDuke"];        conn = new SqlConnection(strCon);        try        {            conn.Open();            return true;        }        catch (Exception)        {            return false;        }        finally        {            conn.Close();        }    }

[WebMethod(Description = "根据 照片名 获得详细数据(DataTable)，strTb,eg:PanView;strImgName,eg:20131019072740-0000150")]    public DataTable getInfoByImgName(string strTb, string strImgName)    {        bool ifCon = conectDB();        if (ifCon)        {            string sql_BfCar = "SELECT * FROM dbo." + strTb + " where ImageName LIKE '%" + strImgName + "%'";            da = new SqlDataAdapter(sql_BfCar, conn);            myds = new DataSet();            da.Fill(myds);            return myds.Tables[0];        }        else        {            return null;        }    }    [WebMethod(Description = "根据 照片名 获得所在Link的所有数据(ReturnResult)，strTb,eg:PanView;strImgName,eg:20131019072740-0000150")]    public ReturnResult getLinkDTByImgName(string strTb, string strImgName)    {        ReturnResult returnResult = new ReturnResult();        bool ifCon = conectDB();        if (ifCon)        {            returnResult.curIndex = Convert.ToInt32(getInfoByImgName(strTb, strImgName).Rows[0][0]);            string strLinkGuid = getInfoByImgName(strTb, strImgName).Rows[0][1].ToString();            string sql_BfCar = "SELECT * FROM dbo." + strTb + " where LinkGuid LIKE '%" + strLinkGuid + "%'";            da = new SqlDataAdapter(sql_BfCar, conn);            myds = new DataSet();            da.Fill(myds);            returnResult.idxList = myds.Tables[0];            return returnResult;        }        else        {            return null;        }    }