[C#] - DataGridView分页

来源：http://xinyuan178.blog.163.com/blog/static/49799652200942342122524/

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using System.Data.SqlClient;


public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    int pageSize = 0;     // 每页显示行数
    int pageCount = 0;    // 页数=总记录数/每页显示行数
    int recordCount = 0;  // 总记录数
    int curPageNum = 0;   // 当前页号
    int curRowNum = 0;    // 当前记录行
    DataSet DS = new DataSet();
    DataTable dtInfo = new DataTable();

    private void Form1_Load(object sender, EventArgs e)
    {
        string connStr = "Server=localhost;Database=Northwind;UID=sa;Pwd=;";
        string cmdStr = "Select * from [Customers]";
        using (SqlConnection sqlConn = new SqlConnection(connStr))
        {
            sqlConn.Open();
            using (SqlDataAdapter sqlDA = new SqlDataAdapter(cmdStr, sqlConn))
            {
                sqlDA.Fill(DS);
            }
            sqlConn.Close();
        }
        dtInfo = DS.Tables[0];
        InitDataSet();
    }

    private void InitDataSet()
    {
        pageSize = 10;                         // 设置页面行数
        recordCount = dtInfo.Rows.Count;
        pageCount = (recordCount / pageSize);  // 计算出总页数
        if ((recordCount % pageSize) > 0) { pageCount++; }
        curPageNum = 1;                        // 当前页数从1开始
        curRowNum = 0;                         // 当前记录数从0开始
        LoadData();
    }

    private void LoadData()
    {
        int startPos = 0;                   // 当前页面开始记录行
        int endPos = 0;                     // 当前页面结束记录行
        DataTable dtTemp = dtInfo.Clone();  // 克隆DataTable结构框架
        if (curPageNum == pageCount)
        {
            endPos = recordCount;
        }
        else
        {
            endPos = pageSize * curPageNum;
        }
        startPos = curRowNum;
        label1.Text = string.Format("第{0}页/共{1}页", curPageNum, pageCount);

        // 从元数据源复制记录行
        for (int i = startPos; i < endPos; i++)
        {
            dtTemp.ImportRow(dtInfo.Rows[i]);
            curRowNum++;
        }

        dataGridView1.DataSource = dtTemp;
    }

    // 三个按钮的事件
    private void ButtonClicked(object sender, EventArgs e)
    {
        switch (((Button)sender).Text)
        {
            case "上一页":
                curPageNum--;
                if (curPageNum <= 0)
                {
                    curPageNum = 0;
                    MessageBox.Show("已经是第一页，请点击“下一页”查看！");
                    return;
                }
                curRowNum = pageSize * (curPageNum - 1);
                LoadData();
                break;

            case "下一页":
                curPageNum++;
                if (curPageNum > pageCount)
                {
                    curPageNum = pageCount;
                    MessageBox.Show("已经是最后一页，请点击“上一页”查看！");
                    return;
                }
                curRowNum = pageSize * (curPageNum - 1);
                LoadData();
                break;

            case "关闭":
                this.Close();
                Application.Exit();
                break;

            default:
                break;
        }
    }
}