C# 实现DataGridView分页功能

C#实现DataGridView分页功能  

2010-07-17 13:45:42|  分类: C#|字号 订阅

 
 

从界面可以看到,在设计时需要一个DataGridView、BindingNavigate、BindingSource控件,分别命名为dgvInfo、bdnInfo、bdsInfo。

     在bdnInfo控件中添加几个用于选择页面的lable和botton,如上图所示。

     设计时:

     1、定义几个所需的公有成员:

       

   

        int pageSize = 0;     //每页显示行数

        int nMax = 0;         //总记录数

        int pageCount = 0;    //页数=总记录数/每页显示行数

        int pageCurrent = 0;   //当前页号

        int nCurrent = 0;      //当前记录行

        DataSet ds = new DataSet();

 

        DataTable dtInfo = new DataTable();

    2、在窗体载入事件中,从数据源读取记录到DataTable中:

       

   

            string strConn = "SERVER=www.dow88.cn;DATABASE=NORTHWIND;UID=SA;PWD=ULTRATEL";   //数据库连接字符串

            SqlConnection conn = new SqlConnection(strConn);

            conn.Open();

            string strSql = "SELECT * FROM CUSTOMERS";

            SqlDataAdapter sda = new SqlDataAdapter(strSql,conn);

            sda.Fill(ds,"ds");

            conn.Close();

 

            dtInfo = ds.Tables[0];

            InitDataSet();

   

      3、用当前页面数据填充DataGridView

         

private void InitDataSet()

        ...{

            pageSize = 20;      //设置页面行数

            nMax = dtInfo.Rows.Count;

            pageCount=(nMax/pageSize);    //计算出总页数

            if ((nMax % pageSize) > 0) pageCount++;

            pageCurrent = 1;    //当前页数从1开始

 

            nCurrent = 0;       //当前记录数从0开始

            LoadData();

        }

private void LoadData()

        ...{

            int nStartPos = 0;   //当前页面开始记录行

            int nEndPos = 0;     //当前页面结束记录行

            DataTable dtTemp = dtInfo.Clone();   //克隆DataTable结构框架

            if (pageCurrent == pageCount)

                nEndPos = nMax;

            else

                nEndPos = pageSize * pageCurrent;

            nStartPos = nCurrent;

            lblPageCount.Text = pageCount.ToString();

            txtCurrentPage.Text = Convert.ToString(pageCurrent);

            //从元数据源复制记录行

            for (int i = nStartPos; i < nEndPos; i++)

            ...{

                dtTemp.ImportRow(dtInfo.Rows[i]);

                nCurrent++;

            }

 

            bdsInfo.DataSource = dtTemp;

            bdnInfo.BindingSource = bdsInfo;

            dgvInfo.DataSource = bdsInfo;

        }

        4、菜单响应事件:

 

private void bdnInfo_ItemClicked(object sender, ToolStripItemClickedEventArgs e)

        ...{

            if (e.ClickedItem.Text == "关闭")

            ...{

                this.Close();

            }

            if (e.ClickedItem.Text == "上一页")

            ...{

                pageCurrent--;

                if (pageCurrent <= 0)

                ...{

                    MessageBox.Show("已经是第一页,请点击“下一页”查看!");

                    return;

                }

                else

                ...{

                    nCurrent = pageSize * (pageCurrent - 1);

                }

                LoadData();

            }

            if (e.ClickedItem.Text == "下一页")

            ...{

                pageCurrent++;

                if (pageCurrent > pageCount)

                ...{

                    MessageBox.Show("已经是最后一页,请点击“上一页”查看!");

 

                    return;

                }

                else

                ...{

                   nCurrent=pageSize*(pageCurrent-1);

                }

                LoadData();

            }

        }

posted @ 2013-09-23 08:13  meimao5211  阅读(580)  评论(0编辑  收藏  举报