datagridview如何设置分页

1. 首先，在项目中添加一个DataGridView控件，并设置其数据源，例如：

   dataGridView1.DataSource = myDataTable;

2. 接着，在窗体上添加一个分页控件，例如：

   private void Form1_Load(object sender, EventArgs e)
   {
       BindingSource bs = new BindingSource();
       bs.DataSource = myDataTable;

       dataGridView1.DataSource = bs;

       BindingNavigator bn = new BindingNavigator(true);
       bn.BindingSource = bs;
       this.Controls.Add(bn);
   }

3. 在分页控件中设置每页显示的记录数和总记录数，例如：

   bn.CountItem.Text = "总记录数：" + myDataTable.Rows.Count.ToString() + "条";
   bn.PositionItem.Visible = false;
   bn.Items.Add("每页显示：");
   ToolStripComboBox tscb = new ToolStripComboBox();
   tscb.Items.Add("10");
   tscb.Items.Add("20");
   tscb.Items.Add("50");
   tscb.SelectedIndex = 0;
   tscb.SelectedIndexChanged += new EventHandler(tscb_SelectedIndexChanged);
   bn.Items.Add(tscb);

4. 在分页控件中添加翻页按钮，并设置其事件处理程序，例如：

   bn.Items.Add("第");
   ToolStripTextBox tstb = new ToolStripTextBox();
   tstb.Text = "1";
   tstb.Width = 50;
   bn.Items.Add(tstb);
   bn.Items.Add("页");
   bn.Items.Add("共" + (myDataTable.Rows.Count / 10 + 1).ToString() + "页");
   bn.Items.Add(new ToolStripButton("首页"));
   bn.Items.Add(new ToolStripButton("上一页"));
   bn.Items.Add(new ToolStripButton("下一页"));
   bn.Items.Add(new ToolStripButton("末页"));
   bn.Items.Add(new ToolStripLabel("跳转到"));
   ToolStripTextBox tstb2 = new ToolStripTextBox();
   tstb2.Text = "1";
   tstb2.Width = 50;
   bn.Items.Add(tstb2);
   bn.Items.Add(new ToolStripButton("确定"));
   bn.Items.Add(new ToolStripLabel("页"));
   bn.ItemClicked += new ToolStripItemClickedEventHandler(bn_ItemClicked);

5. 在事件处理程序中，根据用户的操作计算出当前页码和每页显示的记录数，并重新绑定数据源，例如：

   private void tscb_SelectedIndexChanged(object sender, EventArgs e)
   {
       ToolStripComboBox tscb = (ToolStripComboBox)sender;
       int pageSize = int.Parse(tscb.SelectedItem.ToString());

       BindingSource bs = (BindingSource)dataGridView1.DataSource;
       bs.DataSource = myDataTable;
       bs.Filter = "";
       bs.Sort = "";

       dataGridView1.DataSource = bs;

       BindingNavigator bn = (BindingNavigator)dataGridView1.BindingNavigator;
       bn.CountItem.Text = "总记录数：" + myDataTable.Rows.Count.ToString() + "条";
       bn.PositionItem.Visible = false;
       bn.Items[7].Text = "共" + (myDataTable.Rows.Count / pageSize + 1).ToString() + "页";
       bn.Items[3].Text = "第1页";

       if (myDataTable.Rows.Count > pageSize)
       {
           bs.DataSource = myDataTable.AsEnumerable().Take(pageSize).CopyToDataTable();
       }
   }

   private void bn_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
   {
       BindingSource bs = (BindingSource)dataGridView1.DataSource;
       int pageSize = int.Parse(((ToolStripComboBox)bs.Position).SelectedItem.ToString());
       int pageCount = myDataTable.Rows.Count / pageSize + 1;
       int currentPage = int.Parse(bs.PositionItem.Text.Substring(2, bs.PositionItem.Text.Length - 3));

       switch (e.ClickedItem.Text)
       {
           case "首页":
               currentPage = 1;
               break;
           case "上一页":
               currentPage--;
               break;
           case "下一页":
               currentPage++;
               break;
           case "末页":
               currentPage = pageCount;
               break;
           case "确定":
               currentPage = int.Parse(bs.PositionItem.Text.Substring(2, bs.PositionItem.Text.Length - 3));
               int gotoPage = int.Parse(((ToolStripTextBox)bs.PositionItem).Text);
               if (gotoPage >= 1 && gotoPage <= pageCount)
               {
                   currentPage = gotoPage;
               }
               break;
       }

       bs.DataSource = myDataTable.AsEnumerable().Skip((currentPage - 1) * pageSize).Take(pageSize).CopyToDataTable();
       bs.PositionItem.Text = "第" + currentPage.ToString() + "页";
   }