一个ASP.Net的DataGrid分页控件,在Oracle数据库下,每次只取当前页的数据,不使用存储过程。

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写的不算好,仅供参考。
GridPager.ascx:
 <%@ Control Language="c#" AutoEventWireup="false" Codebehind="GridPager.ascx.cs" Inherits="Test.BaseClass.GridPager" TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%><?xml:namespace prefix = asp /><asp:linkbutton id=lbtnPre style="BORDER-RIGHT: white 2px solid; BORDER-LEFT: white 1px solid" runat="server" Text="..." Visible="False"></asp:linkbutton><asp:linkbutton id=lbtnPage1 style="BORDER-RIGHT: white 2px solid; BORDER-LEFT: white 1px solid" runat="server" Text="1" Visible="False" Enabled="False" Font-Size="Small">1</asp:linkbutton> <asp:linkbutton id=lbtnPage2 style="BORDER-RIGHT: white 2px solid; BORDER-LEFT: white 1px solid" runat="server" Text="2" Visible="False"></asp:linkbutton><asp:linkbutton id=lbtnPage3 style="BORDER-RIGHT: white 2px solid; BORDER-LEFT: white 1px solid" runat="server" Text="3" Visible="False"></asp:linkbutton><asp:linkbutton id=lbtnPage4 style="BORDER-RIGHT: white 2px solid; BORDER-LEFT: white 1px solid" runat="server" Text="4" Visible="False"></asp:linkbutton><asp:linkbutton id=lbtnPage5 style="BORDER-RIGHT: white 2px solid; BORDER-LEFT: white 1px solid" runat="server" Text="5" Visible="False"></asp:linkbutton><asp:linkbutton id=lbtnPage6 style="BORDER-RIGHT: white 2px solid; BORDER-LEFT: white 1px solid" runat="server" Text="6" Visible="False"></asp:linkbutton><asp:linkbutton id=lbtnPage7 style="BORDER-RIGHT: white 2px solid; BORDER-LEFT: white 1px solid" runat="server" Text="7" Visible="False"></asp:linkbutton><asp:linkbutton id=lbtnPage8 style="BORDER-RIGHT: white 2px solid; BORDER-LEFT: white 1px solid" runat="server" Text="8" Visible="False"></asp:linkbutton><asp:linkbutton id=lbtnPage9 style="BORDER-RIGHT: white 2px solid; BORDER-LEFT: white 1px solid" runat="server" Text="9" Visible="False"></asp:linkbutton><asp:linkbutton id=lbtnPage10 style="BORDER-RIGHT: white 2px solid; BORDER-LEFT: white 1px solid" runat="server" Text="10" Visible="False"></asp:linkbutton><asp:linkbutton id=lbtnNext style="BORDER-RIGHT: white 2px solid; BORDER-LEFT: white 1px solid" runat="server" Text="..." Visible="False"></asp:linkbutton>
///////////////////////////////////////////////////////////////////////////////////////
GridPager.ascx.cs:
using System;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.UI.WebControls;
namespace Test.BaseClass
{
    public class GridPager : System.Web.UI.UserControl
   {
        #region 类变量
        protected System.Web.UI.WebControls.LinkButton lbtnNext;
        protected System.Web.UI.WebControls.LinkButton lbtnPage10;
        protected System.Web.UI.WebControls.LinkButton lbtnPage9;
        protected System.Web.UI.WebControls.LinkButton lbtnPage8;
        protected System.Web.UI.WebControls.LinkButton lbtnPage7;
        protected System.Web.UI.WebControls.LinkButton lbtnPage6;
        protected System.Web.UI.WebControls.LinkButton lbtnPage5;
        protected System.Web.UI.WebControls.LinkButton lbtnPage4;
        protected System.Web.UI.WebControls.LinkButton lbtnPage3;
        protected System.Web.UI.WebControls.LinkButton lbtnPage2;
        protected System.Web.UI.WebControls.LinkButton lbtnPage1;
        protected System.Web.UI.WebControls.LinkButton lbtnPre;
        #endregion 
    
        #region 
        /// <summary>
        /// 编号:01
        /// 内容摘要:翻页的对象:DataGrid控件。
        /// </summary>
        public DataGrid TheGrid;

        /// <summary>
        /// 编号:02
        /// 内容摘要:显示查询结果记录数的标签,可以不设置,表示无需显示。
        /// </summary>
        public Label LabelRowsCount;

        /// <summary>
        /// 编号:03
        /// 内容摘要:显示查询结果总页数的标签,可以不设置,表示无需显示。
        /// </summary>
        public Label LabelPageCount;

        /// <summary>
        /// 编号:04
        /// 内容摘要:显示当前页码的标签,可以不设置,表示无需显示。
        /// </summary>
        public Label LabelPageIndex;


        /// <summary>
        /// 编号:05
        /// 内容摘要:查询数据的SQL语句。
        /// </summary>
        private string SelectSQL
        {
            get
            {
                if(ViewState[this.ClientID+"_SelectSQL"] != null)
                    return ViewState[this.ClientID+"_SelectSQL"].ToString();
                else
                    return string.Empty;
            }
            set
            {
                ViewState[this.ClientID+"_SelectSQL"] = value;
            }
        }//SelectSQL结束


        /// <summary>
        /// 编号:06
        /// 内容摘要:每页显示的行数。
        /// </summary>
        public int PageSizes
        {
            get
            {
                if(ViewState[this.ClientID+"_PageSizes"] != null)
                    return (int)ViewState[this.ClientID+"_PageSizes"];
                else
                    return 20;
            }
            set
            {
                ViewState[this.ClientID+"_PageSizes"] = value;
            }
        }//PageSizes结束


        /// <summary>
        /// 编号:07
        /// 内容摘要:总页数。
        /// </summary>
        private int PageCount
        {
            get
            {
                if(ViewState[this.ClientID+"_PageCount"] != null)
                    return (int)ViewState[this.ClientID+"_PageCount"];
                else
                    return 0;
            }
            set
            {
                ViewState[this.ClientID+"_PageCount"] = value;
            }
        }//PageCount结束


        /// <summary>
        /// 编号:08
        /// 内容摘要:当前页码。
        /// </summary>
        private int CurrentPageIndex
        {
            get
            {
                if(ViewState[this.ClientID+"_CurrentPageIndex"] != null)
                    return (int)ViewState[this.ClientID+"_CurrentPageIndex"];
                else
                    return 0;
            }
            set
            {
                ViewState[this.ClientID+"_CurrentPageIndex"] = value;
                if(this.LabelPageIndex!= null)
                    this.LabelPageIndex.Text = (value+1).ToString();
            }
        }//CurrentPageIndex结束

        private LinkButton[] PageButtons
        {
            get
            {
                return new LinkButton[]{lbtnPage1,lbtnPage2,lbtnPage3,lbtnPage4,lbtnPage5,
                                        lbtnPage6,lbtnPage7,lbtnPage8,lbtnPage9,lbtnPage10};
            }
        }
        #endregion

#region 方法区开始
        /// <summary>
        /// 方法编号:01
        /// 内容摘要:初始化页面。
        /// </summary>
  private void Page_Load(object sender, System.EventArgs e)
  {
}


        /// <summary>
        /// 方法编号:02
        /// 内容摘要:设置与本控件关联的控件。
        /// </summary>
        /// <param name="mDataGrid">DataGrid控件,必须提供</param>
        /// <param name="lblRowsCount">显示查询结果记录数的标签,可以输入null,表示无需显示</param>
        /// <param name="lblPageCount">显示查询结果总页数的标签,可以输入null,表示无需显示</param>
        /// <param name="lblPageIndex">显示当前页码的标签,可以输入null,表示无需显示</param>
        public void InitPagerControls(DataGrid mDataGrid,Label lblRowsCount,Label lblPageCount,Label lblPageIndex)
        {
            mDataGrid.AllowPaging = false;
            this.TheGrid = mDataGrid;
            this.LabelRowsCount = lblRowsCount;
            this.LabelPageCount = lblPageCount;
            this.LabelPageIndex = lblPageIndex;
        }


        /// <summary>
        /// 方法编号:03
        /// 内容摘要:改变查询条件重新查询数据。
        /// </summary>
        /// <param name="selectSQL">查询的SQL语句,翻页的时候始终使用该语句获得数据集,直到下一次调用本方法</param>
        public void LoadData(string selectSQL)
        {
            //保存新的SQL语句
            this.SelectSQL = selectSQL;

            //统计符合条件的数据的条数
            int mRowCount = 0;
            string tmpSQL = "SELECT COUNT(*) FROM (" + selectSQL + ") t";
            Database db = new Database();
            System.Data.OleDb.OleDbDataReader tmpDr = db.GetDataReaderFromSQL(tmpSQL);
            if(tmpDr.Read())
                mRowCount = Convert.ToInt32(tmpDr[0]);
           
            //释放数据连接
            tmpDr.Close();
            db.Dispose();

            //如果需要则显示数据总行数
            if(this.LabelRowsCount!=null)
                this.LabelRowsCount.Text = mRowCount.ToString();

            //统计总页数,如果需要则显示总页数
            this.PageCount = (int)Math.Ceiling(((double)mRowCount)/((double)PageSizes));
            if(this.LabelPageCount != null)
                this.LabelPageCount.Text = this.PageCount.ToString();

           
            //DataGrid的当前页回到第一页,按钮也返回第一页的状态
            this.CurrentPageIndex = 0;
            this.ChangePageButtons(0);

            //查询第一页数据
            this.lbtnPages_Click(this.PageButtons[0],null);

        }


        /// <summary>
        /// 方法编号:04
        /// 内容摘要:查询符合条件的数据并绑定DataGrid显示。
        /// </summary>
        private void BindData()
        {
            string selectSQL = this.SelectSQL;

            if(selectSQL != string.Empty)
            {
                Database db = new Database();//这是我自己的一个数据操作类

                int rowStart = (CurrentPageIndex * PageSizes) + 1;//当前页的起始序号
                int rowEnd = (CurrentPageIndex+1) * PageSizes;//当前页的结束序号

                string querySQL = "SELECT * FROM (SELECT t1.*,rownum sn FROM (" + selectSQL + ") t1) t2 " +
                    " WHERE t2.sn BETWEEN "+rowStart.ToString()+" AND " + rowEnd.ToString();
                //查询数据库读取符合条件的数据
                DataTable tb = db.GetDataTableFromSQL(querySQL);

                //绑定DataGrid显示
                TheGrid.DataSource = tb;
                TheGrid.DataBind();

                db.Dispose();
            }
   
        }


        /// <summary>
        /// 方法编号:05
        /// 内容摘要:改变翻页按钮的状态,如显示 21、22 、 ... 30 的页码。
        /// </summary>
        private void ChangePageButtons(int mIndex)
        {
            int tmpRem = 0;
            int tmpDiv = Math.DivRem(this.PageCount,10,out tmpRem);
            if(tmpRem == 0) tmpRem=10;

            //所有按钮恢复默认的状态
            for(int i = 0;i<10;i++)
            {
                int pageNum = mIndex*10 + i + 1;
                this.PageButtons[i].Text = pageNum.ToString();   
                this.PageButtons[i].Visible = true;
                this.PageButtons[i].Enabled = true;
                this.PageButtons[i].Font.Size = System.Web.UI.WebControls.FontUnit.XSmall;
            }//end of for(int i = 0;i<10;i++)

            this.lbtnPre.Visible = true;
            this.lbtnNext.Visible = true;


            //如果目前是1~10页,那么不显示1前面的“...”
            if(mIndex == 0)
                lbtnPre.Visible = false;
           
            //如果目前是最后的一页,则不显示后面的“...”;并且保证显示的翻页按钮不超过最大页数
            if(mIndex == tmpDiv)
            {
                lbtnNext.Visible = false;
                for(int i = 9;i>tmpRem-1;i=i-1)
                    this.PageButtons[i].Visible = false;
            }
            
        }

       
        /// <summary>
        /// 方法编号:06
        /// 内容摘要:显示前十个页码。
        /// </summary>
        private void lbtnPre_Click(object sender, System.EventArgs e)
        {
            this.ChangePageButtons((int)Math.Floor(Math.Max(this.CurrentPageIndex - 10,0)/10));
            this.lbtnPages_Click(this.PageButtons[9],null);
        }


        /// <summary>
        /// 方法编号:07
        /// 内容摘要:显示后十个页码。
        /// </summary>
        private void lbtnNext_Click(object sender, System.EventArgs e)
        {
            this.ChangePageButtons((int)Math.Floor(Math.Max(this.CurrentPageIndex + 10,0)/10));
            this.lbtnPages_Click(this.PageButtons[0],null);
        }


        /// <summary>
        /// 方法编号:08
        /// 内容摘要:查询绑定新的一页。
        /// </summary>
        private void lbtnPages_Click(object sender, System.EventArgs e)
        {
            LinkButton tmpLBtn = sender as LinkButton;
            int pageIndex = Convert.ToInt32(tmpLBtn.Text.Trim()) - 1;
            this.CurrentPageIndex = pageIndex;

            foreach(LinkButton mLBtn in this.PageButtons)
            {
                mLBtn.Enabled = true;
                mLBtn.Font.Size = System.Web.UI.WebControls.FontUnit.XSmall;
            }

            tmpLBtn.Enabled = false;
            tmpLBtn.Font.Size = System.Web.UI.WebControls.FontUnit.Small;

            this.BindData();
        }


  #region Web 窗体设计器生成的代码
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
   //
   InitializeComponent();
   base.OnInit(e);
  }
  
  /// <summary>
  ///  设计器支持所需的方法 - 不要使用代码编辑器
  ///  修改此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
            this.lbtnPre.Click += new System.EventHandler(this.lbtnPre_Click);
            this.lbtnPage1.Click += new System.EventHandler(this.lbtnPages_Click);
            this.lbtnPage2.Click += new System.EventHandler(this.lbtnPages_Click);
            this.lbtnPage3.Click += new System.EventHandler(this.lbtnPages_Click);
            this.lbtnPage4.Click += new System.EventHandler(this.lbtnPages_Click);
            this.lbtnPage5.Click += new System.EventHandler(this.lbtnPages_Click);
            this.lbtnPage6.Click += new System.EventHandler(this.lbtnPages_Click);
            this.lbtnPage7.Click += new System.EventHandler(this.lbtnPages_Click);
            this.lbtnPage8.Click += new System.EventHandler(this.lbtnPages_Click);
            this.lbtnPage9.Click += new System.EventHandler(this.lbtnPages_Click);
            this.lbtnPage10.Click += new System.EventHandler(this.lbtnPages_Click);
            this.lbtnNext.Click += new System.EventHandler(this.lbtnNext_Click);
            this.Load += new System.EventHandler(this.Page_Load);

        }
  #endregion

        #endregion

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