C# 分頁

    public class PagingHelper
    {

        public static DataTable _dt;

        //每页显示多少条
        public static int pageNum = 20;
        //当前是第几页
        public static int pIndex = 1;
        //对象
        //private DataGrid grdList;
        //最大页数
        public static int MaxIndex = 1;
        //一共多少条
        private int allNum = 0;
        #region 初始化数据

        /// <summary>
        /// 初始化数据
        /// </summary>
        /// <param name="grd"></param>
        /// <param name="dtt"></param>
        /// <param name="Num"></param>
        public void ShowPages(DataTable ds, DataGrid dtList,int Num, TextBox txtCurtPage, Button btnGo)
        {
            if (ds == null || ds.Rows.Count == 0)
                return;
            if (ds.Rows.Count == 0)
                return;
            DataTable dt = ds;
            _dt = dt.Clone();
            //this.grdList = grd;
            pageNum = Num == 0 ? 20 : Num;
            pIndex = 1;
            foreach (DataRow r in dt.Rows)
                _dt.ImportRow(r);
         
            SetMaxIndex();
            ReadDataTable((DataGrid)dtList);//繪製 DataGrid
            if (MaxIndex > 1)
            {
                //激活按鈕
                abledBtn((TextBox)txtCurtPage, (Button)btnGo);
                //this.pageGo.IsReadOnly = false;
                //this.btnGo.IsEnabled = true;
            }
        }

        public void abledBtn(TextBox txtCurtPage, Button btnGo)
        {
            txtCurtPage.IsReadOnly = false;
            btnGo.IsEnabled = true;
        }

        #endregion

        #region 画数据  OK

        /// <summary>
        /// 画数据
        /// </summary>
        public void ReadDataTable(DataGrid grdList)
        {
            //pIndex = pIndex;
            try
            {
                DataTable tmpTable = new DataTable();
                tmpTable = _dt.Clone();
                int first = pageNum * (pIndex - 1);
                first = (first > 0) ? first : 0;
                //如果总数量大于每页显示数量
                if (_dt.Rows.Count >= pageNum * pIndex)
                {
                    for (int i = first; i < pageNum * pIndex; i++)
                        tmpTable.ImportRow(_dt.Rows[i]);
                }
                else
                {
                    for (int i = first; i < _dt.Rows.Count; i++)
                        tmpTable.ImportRow(_dt.Rows[i]);
                }
                grdList.ItemsSource = null;
                grdList.ItemsSource = tmpTable.DefaultView;
                tmpTable.Dispose();
            }
            catch
            {
                //return "出錯";
                //MessageBox.Show("错误");
            }
            finally
            {
                //DisplayPagingInfo();
            }
        }

        #endregion

        #region 画每页显示等数据  已置于前台
        //Old  No Used

        /// <summary>
        /// 画每页显示等数据
        /// </summary>
        public void DisplayPagingInfo(Button btnPrev, Button btnNext, Button btnFirst, Button btnLast)
        {
            if (pIndex == 1)
            {
                btnPrev.IsEnabled = false;
                btnFirst.IsEnabled = false;
            }
            else
            {
                btnPrev.IsEnabled = true;
                btnFirst.IsEnabled = true;
            }
            if (pIndex == MaxIndex)
            {
                btnNext.IsEnabled = false;
                btnLast.IsEnabled = false;
            }
            else
            {
                btnNext.IsEnabled = true;
                btnLast.IsEnabled = true;
            }
            //tbkRecords.Text = string.Format("每页{0}条/共{1}条", pageNum, this.allNum);
            int first = (pIndex - 4) > 0 ? (pIndex - 4) : 1;
            int last = (first + 9) > MaxIndex ? MaxIndex : (first + 9);
            //this.grid.Children.Clear();
            //獲取列
            //for (int i = first; i <= last; i++)
            //{
            //    ColumnDefinition cdf = new ColumnDefinition();
            //    this.grid.ColumnDefinitions.Add(cdf);
            //    TextBlock tbl = new TextBlock();
            //    tbl.Text = i.ToString();
            //    tbl.Style = FindResource("PageTextBlock3") as Style;
            //    tbl.MouseLeftButtonUp += new MouseButtonEventHandler(tbl_MouseLeftButtonUp);
            //    tbl.MouseLeftButtonDown += new MouseButtonEventHandler(tbl_MouseLeftButtonDown);
            //    if (i == pIndex)
            //        tbl.IsEnabled = false;
            //    Grid.SetColumn(tbl, this.grid.ColumnDefinitions.Count - 1);
            //    Grid.SetRow(tbl, 0);
            //    this.grid.Children.Add(tbl);
            //}
        }

        #endregion

        #region 首页

        /// <summary>
        /// 首页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void btnFirst_Method(DataGrid grdList)
        {
            pIndex = 1;

            ReadDataTable(grdList);
        }

        /// <summary>
        /// 首页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        //private void btnFirst_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        //{
        //    e.Handled = true;
        //}

        #endregion

        #region 上一页
        /// <summary>
        /// 上一页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void btnPrev_Method(DataGrid grdList)
        {
            if (pIndex <= 1)
                return;
            pIndex--;
            ReadDataTable(grdList);
        }

        /// <summary>
        /// 上一页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        //private void btnPrev_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        //{
        //    e.Handled = true;
        //}

        #endregion

        #region 下一页

        /// <summary>
        /// 下一页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void btnNext_Method(DataGrid grdList)
        {
            if (pIndex >= MaxIndex)
                return;
            pIndex++;
            ReadDataTable(grdList);
        }

        /// <summary>
        /// 下一页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        //private void btnNext_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        //{
        //    e.Handled = true;
        //}

        #endregion

        #region 未页

        /// <summary>
        /// 未页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void btnLast_Method(DataGrid grdList)
        {
            pIndex = MaxIndex;
            ReadDataTable(grdList);
        }

        /// <summary>
        /// 未页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        //private void btnLast_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        //{
        //    e.Handled = true;
        //}

        #endregion

        #region 设置最多大页面

        /// <summary>
        /// 设置最多大页面
        /// </summary>
        public void SetMaxIndex()
        {
            //多少页
            int Pages = _dt.Rows.Count / pageNum;
            if (_dt.Rows.Count != (Pages * pageNum))
            {
                if (_dt.Rows.Count < (Pages * pageNum))
                    Pages--;
                else
                    Pages++;
            }
            MaxIndex = Pages;
            this.allNum = _dt.Rows.Count;
        }

        #endregion

        #region 跳转到多少页

        /// <summary>
        /// 跳转到多少页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void btnGo_Method(TextBox txtCurtPage, DataGrid grdList)
        {
            if (IsNumber(txtCurtPage.Text))
            {
                int pageNum = int.Parse(txtCurtPage.Text);
                if (pageNum > 0 && pageNum <= MaxIndex)
                {
                    pIndex = pageNum;
                    ReadDataTable(grdList);
                }
                else if (pageNum > MaxIndex)
                {
                    pIndex = MaxIndex;
                    ReadDataTable(grdList);
                }
            }
            else
            {
                txtCurtPage.SelectAll();
                txtCurtPage.Focus();
            }
        }
        #endregion

        public Regex RegNumber = new Regex("^[0-9]+$");

        #region 判断是否是数字
        /// <summary>
        /// 判断是否是数字
        /// </summary>
        /// <param name="valString"></param>
        /// <returns></returns>
        public bool IsNumber(string valString)
        {
            Match m = RegNumber.Match(valString);
            return m.Success;
        }
        #endregion
    }

　　

此分頁，實際是將獲取到的DataTable保存在內存中，然後根據頁碼獲取數據，

 附DataRow[] 轉 DataTable 取表結構方法

         /// <summary>
        /// DataRow[] 轉 DataTable 取表結構
        /// </summary>
        /// <param name="cloneDt"></param>
        /// <param name="inDt"></param>
        /// <returns></returns>
        public DataTable TransferDto(DataTable cloneDt, DataRow[] inDtRow)
        {
            try
            {
                DataTable outDt = new DataTable("dt1");
                outDt = cloneDt.Clone();
                foreach (DataRow row in inDtRow)
                {
                    outDt.ImportRow(row);
                }
                return outDt;
                #region Others 1
                /*
                DataTable dt=new DataTable();
                for (int i= 0; i< dg.Columns.Count; i++)
                {
                    DataColumn dc = new DataColumn(dg.Columns[i].Name.ToString());
                    dt.Columns.Add(dc);
                }
                for (int i = 0; i< dg.Rows.Count; i++)
                {
                    DataRow dr = dt.NewRow();
                    for (int j = 0; j < dg.Columns.Count; j++)
                    {
                        dr[j] = dg.Rows[i].Cells[j].Value.ToString();
                    }
                    dt.Rows.Add(dr);
                }
                return dt;
                 */
                #endregion
            }
            catch (Exception lo_Ex)
            {
                throw new Exception("TransferDto is Fail,ErrMsg:=" + lo_Ex.Message.Substring(0, 200));
            }
        }