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

/// <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();

}
}
}