var categories = ctx.Sync_Categorys;
                foreach (var cateogry in categories)
                {
                    var boards = ctx.Sync_Boards.Where(b => b.CategoryID == cateogry.CategoryID);
                    foreach (var board in boards)
                    {
                        string address = string.Format("http://shouji.baidu.com/software/list?cid={0}&boardid={1}&page_num={2}", cateogry.CategoryID, board.BoardID, 1);
                        //根据第一页的信息获取当前子分类的页面数量
                        var shtml = WebUtils.GetUrlOutput(address, Encoding.UTF8);
                        if (!string.IsNullOrEmpty(shtml))
                        {
                            HtmlDocument doc = new HtmlDocument();
                            doc.LoadHtml(shtml);
                            HtmlNode rootnode = doc.DocumentNode;
                            //页面数量的XPath
                            var xpath = @"//*[@id='doc']/div[3]/div[2]";
                            HtmlNodeCollection items = rootnode.SelectNodes(xpath);
                            if (items != null && items.Count > 0)
                            {
                                //获取到某个分类下的App的页面数量
                                int pagenum = int.Parse(items[0].OuterHtml.Split('\"')[3].Trim());
                                for (int i = 1; i <= pagenum; i++)
                                {
                                    if (shtml.IndexOf("app-box") > 0)
                                    {
                                        string addressurl = string.Format("http://shouji.baidu.com/software/list?cid={0}&boardid={1}&page_num={2}", cateogry.CategoryID, board.BoardID, i.ToString());
                                        //每一个页面对应一个addressurl
                                        var shtmls = WebUtils.GetUrlOutput(addressurl, Encoding.UTF8);
                                        //调用抓取App的方法，循环抓取
                                        SyncAppBase(ctx, shtmls, board.BoardID);
                                    }
                                }
                            }
                        }
                    }
                }