//生成的单据号格式：{自定义前缀}{年月日}{000X}，如：PO202312120001

    //1.单独使用获取单据号,如：
    Demo_Order demo = new Demo_Order();
    demo.OrderNo = demo.Create(x => x.OrderNo, "PO", x => x.CreateDate);

    //2.在生成页面新建数据时生成自增单据号
    //重写[表Service.cs]的add方法，实现下面的代码
    public override WebResponseContent Add(SaveModel saveDataModel)
    {
        saveDataModel.MainData["OrderNo"] = "这里随便填个默认值";
        WebResponseContent webResponse = new WebResponseContent();
        AddOnExecuting = (Demo_Order order, object list) =>
        {
            /************每天从1开始生成自增单据号，参数说明**********/
            // x => x.OrderNo 给指定字段生成单据号
            // "PO" 自定义单据号开头
            // x => x.CreateDate 指定日期字段,内部通过此字段排序，每天单据号从1开始
            order.OrderNo = order.Create(x => x.OrderNo, "PO", x => x.CreateDate);
            return webResponse.OK();
        };
        return base.Add(saveDataModel);
    }

//企业版在[单据编码]菜单直接配置可自动生成单据号