Csharp windowform bindingNavigator,bindingSource,DataGridView簡單分頁：首頁,上一頁,下一頁,末頁

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/// <summary>     /// 塗聚文 2011-10-24 （參考相關網絡和書藉資料）     /// 締友計算機信息技術有限公司     ///C# Winform 簡單分頁： 首頁，上一頁，下一頁，末頁     /// </summary>     public partial class FormDataGridViewPage : Form     {         /// <summary>         /// 每页显示行数         /// </summary>         int pageSize = 0;         /// <summary>         /// 总记录数         /// </summary>         int nMax = 0;                /// <summary>         /// 页数＝总记录数/每页显示行数         /// </summary>         int pageCount = 0;           /// <summary>         /// 当前页号         /// </summary>         int pageCurrent = 0;          /// <summary>         /// 当前记录行         /// </summary>         int nCurrent = 0;               DataSet ds = new DataSet();         DataTable dtInfo = new DataTable();         AdministrativeAreaListBLL administrativeAreaListBLL = new AdministrativeAreaListBLL();         AdministrativeAreaListInfo administrativeAreaListInfo = new AdministrativeAreaListInfo();         FormOperatingStringInfo formOperatingStringInfo = new FormOperatingStringInfo();           /// <summary>         ///         /// </summary>         public FormDataGridViewPage()         {             InitializeComponent();         }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void FormDataGridViewPage_Load(object sender, EventArgs e)         {             dtInfo = administrativeAreaListBLL.SelectAdministrativeAreaListDataTable();             InitDataSet();         }          /// <summary>         /// 用首页数据填充         /// 塗聚文         /// 締友計算機信息技術有限公司         ///C# Winform 簡單分頁： 首頁，上一頁，下一頁，末頁         /// </summary>         private void InitDataSet()         {             pageSize = 20;      //设置页面行数             nMax = dtInfo.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();         }         /// <summary>         /// 用末頁數據填育         /// 塗聚文         /// 締友計算機信息技術有限公司         ///C# Winform 簡單分頁： 首頁，上一頁，下一頁，末頁         /// </summary>         private void EndDataSetPage()         {             pageSize = 20;      //设置页面行数             nMax = dtInfo.Rows.Count;             pageCount = (nMax / pageSize);    //计算出总页数              int rou = nMax % pageSize;             if (rou > 0)             {                 nCurrent = nMax - (nMax % pageSize);//不是正好整除页码，取余数页                 pageCount++;             }             else             {                 nCurrent = nMax - pageSize;             }                  pageCurrent = pageCount;             LoadData();         }         /// <summary>         /// 填充DataGridView         /// 塗聚文         /// 締友計算機信息技術有限公司         ///C# Winform 簡單分頁： 首頁，上一頁，下一頁，末頁         /// </summary>         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 = dtInfo.Clone();   //克隆DataTable结构框架               if (pageCurrent == pageCount)             {                 nEndPos = nMax;             }             else             {                 nEndPos = pageSize * pageCurrent;             }               nStartPos = nCurrent;             lblPageCount.Text = "/"+pageCount.ToString(); //共多少頁             txtCurrentPage.Text = Convert.ToString(pageCurrent);//當前頁                 //从元数据源复制记录行             for (int i = nStartPos; i < nEndPos; i++)             {                 dtTemp.ImportRow(dtInfo.Rows[i]);                 nCurrent++;             }             bindingSourceInfo.DataSource = dtTemp;             bindingNavigatorInfo.BindingSource = bindingSourceInfo;             DataGridViewInfo.DataSource = bindingSourceInfo;         }         /// <summary>         /// 点击的选择页操作         /// 涂聚文         /// 締友計算機信息技術有限公司         ///C# Winform 簡單分頁： 首頁，上一頁，下一頁，末頁         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void bindingNavigatorInfo_ItemClicked(object sender, ToolStripItemClickedEventArgs e)         {             if (e.ClickedItem.Text == "关闭")             {                 this.Close();             }             if (e.ClickedItem.Text == "首页")             {                 pageCurrent = 1;                 pageSize = 20;                 InitDataSet();             }             if (e.ClickedItem.Text == "末页")             {                 EndDataSetPage();             }             if (e.ClickedItem.Text == "上一页")             {                 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();             }             if (e.ClickedItem.Text == "下一页")             {                 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();               }         } }