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();}}