net中获取datatable中指定页数据


 #region 显示分页数据信息列表

        /// <summary>

        /// 显示分页数据信息列表

        /// </summary>

        /// <param name="intPage">页号</param>

        /// <returns> </returns>

        private DataTable CreateTaskTable(int intPage, string sql)

        {

            int intPageCount = 1;

            int intRecordCount = 1;

            DataTable dtTasks;

            try

            {

                //取得任务集合，并得到当前页号、页数、记录数

                //得到用户所有类型的任务

                dtTasks =GetTasksAlready(this.intPageSize, ref intPage, out intPageCount, out intRecordCount, sql);

                #region 设置翻页信息

                //将取得的页号记录在ViewState中

                ViewState["Page"] = intPage;

                //将取得的页数记录在ViewState中

                ViewState["PageCount"] = intPageCount;

                lblPageMsg.Text = "共<font color='#0099CC'>" + intPageCount.ToString()

                    + "</font>页    每页<font color='#0099CC'>" + intPageSize.ToString()

                    + "</font>条    总共<font color='#0099CC'>" + intRecordCount.ToString()

                    + "</font>条        当前是第<font color='#0099CC'>"

                    + intPage.ToString() + "</font>页    ";

                this.tbPage.Visible = true;

                txtPage.Text = intPage.ToString();

                if (intPage >= intPageCount)

                {

                    lbtnLast.Enabled = false;

                    lbtnNext.Enabled = false;

                }

                else

                {

                    lbtnLast.Enabled = true;

                    lbtnNext.Enabled = true;

                }

                if (intPage <= 1)

                {

                    lbtnFirst.Enabled = false;

                    lbtnPrev.Enabled = false;

                }

                else

                {

                    lbtnFirst.Enabled = true;

                    lbtnPrev.Enabled = true;

                }

                if (intRecordCount > 0)

                {

                    txtPage.Enabled = true;

                }

                else

                {

                    txtPage.Enabled = false;

                }

                #endregion

                return dtTasks;

            }

            catch (Exception ex)

            {

                throw ex;

            }

        }

        #endregion

#region 获取分页数据信息列表

        /// <summary>

        /// 获取分页数据信息列表

        /// </summary>

        /// <param name="intPageSize">显示信息数目条数</param>

        /// <param name="intPage">第几页</param>

        /// <param name="intPageCount">页数总和</param>

        /// <param name="intRecordCount">总记录条数</param>

        /// <param name="sql">查询sql语句</param>

        /// <returns></returns>

        public static DataTable GetTasksAlready(int intPageSize, ref int intPage, out int intPageCount, out int intRecordCount, string sql)

        {

            DataTable dt = new DataTable();

            dt = new MSSqlDataAccessYZ().ExecuteDataTable(CommandType.Text, sql, null, null);

            DataTable newTasks = dt.Clone();

            intRecordCount = dt.Rows.Count;

            if (intRecordCount % intPageSize == 0)

            {

                intPageCount = intRecordCount / intPageSize;

            }

            else

            {

                intPageCount = intRecordCount / intPageSize + 1;

            }

            if (intPageCount <= 0)

            {

                intPageCount = 1;

            }

            if (intPage < 1)

            {

                intPage = 1;

            }

            if (intPage >= intPageCount)

            {

                intPage = intPageCount;

            }

            int intStartPosition = intPageSize * (intPage - 1);

            int intEndPosition = intStartPosition + intPageSize;

            if (intEndPosition > intRecordCount)

            {

                intEndPosition = intRecordCount;

            }

            if (dt.Rows.Count != 0)

            {

                //遍历每一个任务，取得相应的信息

                for (int i = intStartPosition; i < intEndPosition; i++)

                {

                    DataRow drNewRow = newTasks.NewRow();

                    drNewRow.ItemArray = dt.Rows[i].ItemArray;//这是加入的是第一行

                    newTasks.Rows.Add(drNewRow);

                }

            }

            return newTasks;

        }

        #endregion

前端代码：

<table id="tbPage" cellspacing="0" cellpadding="0" align="center" border="0" runat="server">

                <tr style="font-size: 9pt" height="22">

                    <td width="3%">

                         

                    </td>

                    <td nowrap width="38%">

                        <asp:Label ID="lblPageMsg" runat="server"></asp:Label>

                    </td>

                    <td nowrap width="8%">

                        <asp:LinkButton ID="lbtnFirst" runat="server" OnClick="lbtnFirst_Click">第一页</asp:LinkButton>  

                    </td>

                    <td nowrap width="8%">

                        <asp:LinkButton ID="lbtnPrev" runat="server" OnClick="lbtnPrev_Click">上一页</asp:LinkButton>  

                    </td>

                    <td nowrap width="8%">

                        <asp:LinkButton ID="lbtnNext" runat="server" onclick="lbtnNext_Click">下一页</asp:LinkButton>  

                    </td>

                    <td nowrap width="8%">

                        <asp:LinkButton ID="lbtnLast" runat="server" onclick="lbtnLast_Click">最后一页</asp:LinkButton>  

                    </td>

                    <td nowrap width="6%">

                        跳到第

                    </td>

                    <td nowrap width="4%">

                        <asp:TextBox ID="txtPage" runat="server" Columns="2" Width="16pt"></asp:TextBox>

                    </td>

                    <td width="6%">

                        页

                    </td>

                    <td width="6%">

                        <asp:ImageButton ID="btnGo" runat="server" ImageUrl="~/images/go.gif"

                            onclick="btnGo_Click"></asp:ImageButton>

                    </td>

                    <td width="5%">

                         

                    </td>

                </tr>

            </table>