当前位置： 移动技术网 > IT编程>开发语言>.net > WinFrom 在Devexpress里用GridControl和DataNavigtor进行分页

WinFrom 在Devexpress里用GridControl和DataNavigtor进行分页

2020年03月09日  | 移动技术网IT编程  | 我要评论

毛竹之乡,北方影院真假千金,清吉泰

1，分页嘛先要有个sql 程序才能写下去 先提供下sql的思路，对于分页的sql我之前帖子有介绍，就不一一介绍了

select top pagesize *     --显示数量
from (select row_number()   
over(order by eg_id asc) as rownumber,* --行数
from exchanggifts) temp_row
where rownumber>((pageindex-1)*pagesize);--开始页数  --建议sql

存储过程参考下

create proc [dbo].[p_getcardlevelspaged]
    @pagesize int,
    @pageindex int,
    @count int output,
    @levelname varchar(20)
as
begin
    select top(@pagesize) * from cardlevels 
    where cl_id not in(
                        select top(@pagesize*(@pageindex-1)) cl_id from cardlevels where cl_levelname like '%'+@levelname+'%'
                      ) 
    and cl_levelname like '%'+@levelname+'%'
    select @count=count(*) from cardlevels where cl_levelname like '%'+@levelname+'%'
end

go

2,例子中用的分页sql：

select * from(select row_number() over(order by e.eg_id) as rows ,e. * from exchanggifts e)
 as a where a.rows between 1 and 10;

 

 

代码  注释详细

 public partial class xtraform2 : devexpress.xtraeditors.xtraform
    {

        private int pageindex = 1; //当前页码
        private int pagesize = 5;   //每页的尺寸
        private int pagecount = 0; //总页数
      
       public xtraform2()
        {
            initializecomponent();
        }

  //获取记录总数
        public int getrecordcount()
        {
            int count = 0;
            string sql = "select count(*) from exchanggifts";
            count = convert.toint32(dbhelper.getscalar(sql, null, false));
            return count;
        }

        //获取当前页的记录列表
        public datatable getlistbypage(int startindex, int endindex)
        {
            datatable dt = new datatable();
            stringbuilder strsql = new stringbuilder();
            strsql.append("select * from (");
            strsql.append("select row_number() over(order by t.[eg_id]) as rows,t.* from exchanggifts as t) as tt");
            strsql.appendformat(" where tt.rows between {0} and {1} ", startindex, endindex);
            dt = dbhelper.query(strsql.tostring(), null);
            return dt;
        }

        //绑定数据表格控件
        public void bindpagegridlist()
        {
            //记录的开始索引
            int startindex = (pageindex - 1) * pagesize + 1;
            //记录的结束索引
            int endindex = pageindex * pagesize;
            //总记录数
            int row = getrecordcount();

            if (row % pagesize > 0)
            {
                pagecount = row / pagesize + 1;
            }
            else
            {
                pagecount = row / pagesize;
            }
            //如果当前是最后一页，设置最后一行记录的索引
            if (pageindex == pagecount)
            {
                endindex = row;
            }

            datatable dt = this.getlistbypage(startindex, endindex);
            gc.datasource = dt;
            nvgdatapager.datasource = dt;
            nvgdatapager.textstringformat = string.format("第{0}页，共{1}页", pageindex, pagecount);
        }

        private void nvgdatapager_buttonclick(object sender, navigatorbuttonclickeventargs e)
        {
            string type = e.button.tag.tostring();
            switch (type)
            {
                case "首页":
                    pageindex = 1;
                    break;
                case "末页":
                    pageindex = pagecount;
                    break;
                case "下一页":
                    if (pageindex < pagecount)
                    {
                        pageindex++;
                    }
                    break;
                case "上一页":
                    if (pageindex > 1)
                    {
                        pageindex--;
                    }
                    break;
            }
            this.bindpagegridlist(); //绑定当前页到控件
        }

}

效果图

 

您可能感兴趣的文章:

如对本文有疑问，请在下面进行留言讨论，广大热心网友会与你互动！！ 点击进行留言回复

相关文章:

验证码：
最近更新的文章
大家感兴趣的文章
移动技术网