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       private void Bind()        {            //td = um.dataAll();            pageSize = 30;      //设置页面行数            nMax = td.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 = td.Clone();   //克隆DataTable结构框架            if (pageCurrent == pageCount)            {                nEndPos = nMax;            }            else            {                nEndPos = pageSize * pageCurrent;            }            nStartPos = nCurrent;            lblPageCount.Text = "共 " + pageCount.ToString() + " 页";            txtCurrentPage.Text = Convert.ToString(pageCurrent);            //从元数据源复制记录行            if (td.Rows.Count > 0)            {                for (int i = nStartPos; i < nEndPos; i++)                {                    dtTemp.ImportRow(td.Rows[i]);                    nCurrent++;                }            }                       dataGridView1.DataSource = dtTemp;            //datagridView默认不选中行                       int endC = td.Rows.Count;            if (endC > pageSize * pageCurrent)                endC = pageSize * pageCurrent;            int k = 0;            for (int i = pageSize * (pageCurrent - 1) + 1; i <= endC; i++)            {                dataGridView1.Rows[k].HeaderCell.Value = i.ToString();                k++;            }                              }private void up_Click(object sender, EventArgs e)        {            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();        }        private void down_Click(object sender, EventArgs e)        {            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();        }        private void first_Click(object sender, EventArgs e)        {            pageCurrent = 1;            nCurrent = pageSize * (pageCurrent - 1);            LoadData();        }        private void end_Click(object sender, EventArgs e)        {            pageCurrent = pageCount;            nCurrent = pageSize * (pageCurrent - 1);            LoadData();        }        private void skip_Click(object sender, EventArgs e)        {            int CurrentP = Convert.ToInt32(txtCurrentPage.Text.ToString());            if (CurrentP > pageCount)            {                MessageBox.Show("超过最大页数，请重新输入");                return;            }            else            {                pageCurrent = CurrentP;                nCurrent = pageSize * (pageCurrent - 1);                LoadData();            }        }