DataTable分页实例，
DateTable分页通用类：
public static class Page {
///
/// DataTable分页
///
/// DataTable
/// 页索引,注意：从1开始
/// 每页大小
/// 分好页的DataTable数据 第1页 每页10条
public static DataTable GetPagedTable(DataTable dt, int PageIndex, int PageSize)
{
if (PageIndex == 0) { return dt; }
DataTable newdt = dt.Copy();
newdt.Clear();
int rowbegin = (PageIndex - 1) * PageSize;
int rowend = PageIndex * PageSize;
if (rowbegin >= dt.Rows.Count)
{ return newdt; }
if (rowend > dt.Rows.Count)
{ rowend = dt.Rows.Count; }
for (int i = rowbegin; i <= rowend - 1; i++)
{
DataRow newdr = newdt.NewRow();
DataRow dr = dt.Rows[i];
foreach (DataColumn column in dt.Columns)
{
newdr[column.ColumnName] = dr[column.ColumnName];
}
newdt.Rows.Add(newdr);
}
return newdt;
}
///
/// 返回分页的页数
///
/// 总条数
/// 每页显示多少条
/// 如果 结尾为0：则返回1
public static int PageCount(int count, int pageye)
{
int page = 0;
int sesepage = pageye;
if (count % sesepage == 0) { page = count / sesepage; }
else { page = (count / sesepage) + 1; }
if (page == 0) { page += 1; }
return page;
}
}1. 创建分页需要的属性以及类：
DataTable dbtb = new DataTable();
int pageSize = 20; //每页显示行数
int nMax = 0; //总记录数
int pageCount = 0; //页数＝总记录数/每页显示行数
int pageCurrent = 1; //当前页号2.初始化加载>页面加载事件：
dbtb.Columns.Add("序号", typeof(int));
dbtb.Columns.Add("操作", typeof(string));
dbtb.Columns.Add("用户", typeof(string));
dbtb.Columns.Add("昵称", typeof(string));
dbtb.Columns.Add("操作时间", typeof(string));
adduserFromDB("");
dgv_Log.Rows.Clear();
LodDate(dbtb, 1, pageSize);
this.txtCurrentPage.Text = "1";3：调用的方法：
public void adduserFromDB(string sqlParam)
{
dbtb.Rows.Clear();
dgv_Log.Rows.Clear();
System.Collections.Generic.List loglist = Core.User.GetLogList(sqlParam);
foreach (Entity.LogItem log in loglist)
{
int index = this.dgv_Log.Rows.Add();
this.dgv_Log.Rows[index].Cells["ID"].Value = log.id;
this.dgv_Log.Rows[index].Cells["data"].Value = log.Data;
this.dgv_Log.Rows[index].Cells["UserCode"].Value = log.UserCode;
this.dgv_Log.Rows[index].Cells["UserName"].Value = log.UserName;
this.dgv_Log.Rows[index].Cells["Datetime"].Value = log.Datetime;
DataRow newRow = dbtb.NewRow();
newRow["序号"] = log.id;
newRow["操作"] = log.Data;
newRow["用户"] = log.UserCode;
newRow["昵称"] = log.UserName;
newRow["操作时间"] = log.Datetime;
dbtb.Rows.Add(newRow);
}
LodDate(dbtb, 1, pageSize);
}
// 加载
public void LodDate(DataTable dbt, int PageIndex, int PageSize)
{
//pageSize = 10; //每页显示行数
nMax = dbt.Rows.Count; //总记录数
pageCount = Core.Page.PageCount(nMax,pageSize); //页数＝总记录数/每页显示行数
pageCurrent = PageIndex; //当前页号
//nCurrent = 0; //当前记录行
DataTable dt = Core.Page.GetPagedTable(dbt, PageIndex, PageSize);
this.labelX3.Text = dbt.Rows.Count.ToString();
this.labelX4.Text = PageSize.ToString();
this.lblPageCount.Text = (Core.Page.PageCount(dbt.Rows.Count, PageSize)).ToString();
this.txtCurrentPage.Text = PageIndex.ToString();
//this.lblPageCount.Text = (Convert.ToInt32(dbt.Rows.Count) / PageSize).ToString();
this.dgv_Log.Rows.Clear();
//for (int i = 0; i < dt.Columns.Count; i++)
//{
for (int j = 0; j < dt.Rows.Count; j++)
{
//temp = dt.Rows[j][i].ToString();//具体情况具体设置
int index = this.dgv_Log.Rows.Add();
this.dgv_Log.Rows[index].Cells["ID"].Value = dt.Rows[j][0].ToString();
this.dgv_Log.Rows[index].Cells["data"].Value = dt.Rows[j][1].ToString();
this.dgv_Log.Rows[index].Cells["UserCode"].Value = dt.Rows[j][2].ToString();
this.dgv_Log.Rows[index].Cells["UserName"].Value = dt.Rows[j][3].ToString();
this.dgv_Log.Rows[index].Cells["Datetime"].Value = dt.Rows[j][4].ToString();
}
//}
} 4：第一页
dgv_Log.Rows.Clear();
LodDate(dbtb, 1, pageSize);
this.txtCurrentPage.Text = "1";5：最后一页
dgv_Log.Rows.Clear();
LodDate(dbtb, pageCount, pageSize);
this.txtCurrentPage.Text = pageCount.ToString();6：上一页
if (pageCurrent >1)
{
pageCurrent--;
LodDate(dbtb, pageCurrent, pageSize);
this.txtCurrentPage.Text = pageCurrent.ToString();
}else
{
MessageBox.Show("已经是第一页，请点击“下一页”查看！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
} 7：下一页
if (pageCount > pageCurrent)
{
pageCurrent++;
LodDate(dbtb, pageCurrent, pageSize);
this.txtCurrentPage.Text = pageCurrent.ToString();
}
else
{
MessageBox.Show("已经是最后一页，请点击“上一页”查看！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
8：删除的时候需要从Datatable删除查找到的行( 删除的时候需要更新状态)
//从DataTable中去掉指定的行
DataRow[] foundRow = dbtb.Select("序号=" + id);
foreach (DataRow row in foundRow)
{
dbtb.Rows.Remove(row);
} //更新底部状态 this.labelX3.Text = dbtb.Rows.Count.ToString();
this.labelX4.Text = pageSize.ToString();
this.lblPageCount.Text = (Core.Page.PageCount(dbtb.Rows.Count, pageSize)).ToString();
//this.txtCurrentPage.Text = PageIndex.ToString();