[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
   
     ;
 }
 }
}