DEV—【GridControl主从表】

先附上效果图，不是想要这个效果的朋友就不用可以继续寻找了。

DEV—GridControl制作主从表：

（注：此例没有用到数据库，只是单纯的在内存中操作数据。）

写这一笔，是为了能更好的理解主从表，的搭建关系。

1.环境：

　　主表（这里用类代替）：

      /// <summary>
      /// 主表
     /// </summary>
     public class mobile_flash_promotions
     {

         /// <summary>
         /// ID
         /// </summary>
         public string id { get; set; }

         public string sid { get; set; }

         /// <summary>
         /// 活动标题
         /// </summary>
         public string title { get; set; }

         public string pro_desc { get; set; }

         /// <summary>
         /// 活动链接
         /// </summary>
         public string link { get; set; }

         /// <summary>
         /// 活动开始时间
         /// </summary>
         public string start_time { get; set; }

         /// <summary>
         /// 活动结束时间
         /// </summary>
         public string end_time { get; set; }

         /// <summary>
         /// 活动图片
         /// </summary>
         public string pict { get; set; }

         public string seq { get; set; }

         /// <summary>
         ///活动 创建时间
         /// </summary>
         public string create_time { get; set; }

         /// <summary>
         /// 活动创建人
         /// </summary>
         public string creater { get; set; }

         /// <summary>
         /// 活动创建分店名称
         /// </summary>
         public string create_shop_name { get; set; }

         /// <summary>
         /// 活动创建分店sid
         /// </summary>
         public string create_shop_sid { get; set; }

         /// <summary>
         /// 是否是旗舰店
         /// </summary>
         public string flag { get; set; }

         /// <summary>
         /// 活动店铺集合
         /// </summary>
         public List<mobile_promotion_product> ls_p { get; set; }
     }

主表类

　　从表（仍然是类）：

     /// <summary>
     /// 从表
    /// </summary>
     public class mobile_promotion_product
     {
         public string sid { get; set; }

         public string promotion_sid { get; set; }

         public string product_sid { get; set; }

         public string shop_sid { get; set; }

         public string seq { get; set; }
     }

从表类

　　GridControl中在MainView中显示主表的GridView，随后添加一个Level在其中添加从表的GridView，如图：

来具体说明一下，主表与从表的关系式通过主表类中的List<从表>来确立的。

如果在主从表功能实现后，从表的列名和自己写好的从表的GridView的列名不相符，那就是在GridControl中添加Level时，Level的name与主表类中代表从表集合的字段名不一样所导致的。（也就是说，如果不需要定制从表的GridView，完全可以不添加Level和从表的GridView）。

2.模拟数据库环境：

首先说要实现的效果，【点击主表Row时，刷新从表信息】

刚才提到过本例子的数据都是在内存中操作，所以首先写一个加载数据的方法：

         /// <summary>
         /// 主表数据源
       /// </summary>
         List<mobile_flash_promotions> ls_f = new List<mobile_flash_promotions>();

         /// <summary>
         /// 从表数据源
       /// </summary>
         List<mobile_promotion_product> ls_p = new List<mobile_promotion_product>();

         /// <summary>
         /// 向数据源加载数据
       /// </summary>
         public void LoadBaseData()
         {

             mobile_promotion_product mpp1 = new mobile_promotion_product() { sid = "", product_sid = "MS10001", promotion_sid = "", shop_sid = "", seq = "" };
             mobile_promotion_product mpp2 = new mobile_promotion_product() { sid = "", product_sid = "MS10002", promotion_sid = "", shop_sid = "", seq = "" };
             mobile_promotion_product mpp3 = new mobile_promotion_product() { sid = "", product_sid = "MS10003", promotion_sid = "", shop_sid = "", seq = "" };
             mobile_promotion_product mpp4 = new mobile_promotion_product() { sid = "", product_sid = "MS10004", promotion_sid = "", shop_sid = "", seq = "" };

             ls_p.Add(mpp1);
             ls_p.Add(mpp2);
             ls_p.Add(mpp3);
             ls_p.Add(mpp4);

             mobile_flash_promotions mfp1 = new mobile_flash_promotions() { id = "", sid = "", title = "第一条活动", pro_desc = "测试用例", link = "www.baidu.com", start_time = "2014-03-24", end_time = "2014-04-03", pict = "/picture/111000.jpg", seq = "", create_time = "2014-03-24", creater = "shiying", create_shop_name = "海淀区", create_shop_sid = "", flag = "" };
             mobile_flash_promotions mfp2 = new mobile_flash_promotions() { id = "", sid = "", title = "第二条活动", pro_desc = "测试", link = "www.shopin.net", start_time = "2013-02-13", end_time = "2014-04-03", pict = "/picture/qdq.jpg", seq = "", create_time = "2013-05-30", creater = "shiying", create_shop_name = "朝阳区", create_shop_sid = "", flag = "" };

             ls_f.Add(mfp1);
             ls_f.Add(mfp2);
         }

向主从表添加基本数据

然后我们添加一个Timer进来，设置每5秒添加一条数据，Enable=True。

         /// <summary>
         /// 标记从ID=5开始添加
       /// </summary>
         int i = ;

         /// <summary>
         /// 每5秒添加一次数据
       /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void timer1_Tick(object sender, EventArgs e)
         {
             i = i + ;

             mobile_promotion_product mpp5 = new mobile_promotion_product() { sid = (i).ToString(), product_sid = "MS1000" + (i).ToString(), promotion_sid = "", shop_sid = "", seq = "" };

             ls_p.Add(mpp5);
         }

Timer

数据添加完了，下一步是查询：

         /// <summary>
         /// 查询
       /// </summary>
         public void Query()
         {

             List<mobile_promotion_product> ls_p_f1 = ls_p.Where(p => p.promotion_sid == ls_f[].sid).ToList();
             List<mobile_promotion_product> ls_p_f2 = ls_p.Where(p => p.promotion_sid == ls_f[].sid).ToList();

             ls_f[].ls_p = ls_p_f1;
             ls_f[].ls_p = ls_p_f2;

             gc_Photosys.DataSource = ls_f;
         }

查询

基本代码都oK了，剩下的是何时调用查询，本例的查询时发生在点击主表的Row的第一个Cell时发生，即向主表的GridView添加RowCellClick事件：

         /// <summary>
         /// 主表选中行发生改变时折叠上一个展开的从表+点击主表Row查询从表
       /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void gv_f_RowCellClick(object sender, DevExpress.XtraGrid.Views.Grid.RowCellClickEventArgs e)
         {
             if (gv_f_rowhandle != e.RowHandle)
             {
                 //折叠从表
                 gv_f.SetMasterRowExpanded(gv_f_rowhandle, false);

                 gv_f_rowhandle = e.RowHandle;
             }

             if (e.Column.ColumnHandle == )
             {
                 Query();
             }
         }

主表RowCellClick事件

将主表类的集合绑定到主表的GridView中（MainView的GridView） 后，主从表就实现了！

总结：主从表的实现相对于DEV来说很简单，只需要在主表的每个对象中添加一个从表对象的集合即可。