不错的分页类

View Code using System; using System.Text; using System.Collections; using System.Collections.Generic; using System.Text.RegularExpressions; using System.IO; using System.Web.UI; using System.Globalization; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; namespace Demo{ public interface IPageIndexChangedEventHandler { void BindData( int pageIndex, int pageSize); } public class AjaxPager : Control, ICallbackEventHandler, INamingContainer { #region Member Variables private int lowerBound; private int upperBound; private HyperLink previousLink; private HyperLink nextLink; private HyperLink firstLink; private HyperLink lastLink; private Control targetControl; #endregion #region Public Properties public int PageIndex { get { int pageIndex = 1 ; if (Page != null && Page.IsPostBack && ViewState[ " PageIndex " ] != null ) { pageIndex = ( int )ViewState[ " PageIndex " ]; } if (pageIndex < 1 ) { return 1 ; } else { return pageIndex; } } set { ViewState[ " PageIndex " ] = value; } } public int PageSize { get { int pageSize = Convert.ToInt32(ViewState[ " PageSize " ]); if (pageSize <= 0 ) { return 10 ; } return pageSize; } set { ViewState[ " PageSize " ] = value; } } public int LeftLength { get { return PageLength / 2 ; } } public int RightLength { get { return PageLength / 2 ; } } public int PageLength { get { int pageLength = Convert.ToInt32(ViewState[ " PageLength " ]); if (pageLength <= 3 ) return 3 ; if (pageLength % 2 == 0 ) { return pageLength + 1 ; } return pageLength; } set { ViewState[ " PageLength " ] = value; } } public int TotalPages { get { return CalculateTotalPages(TotalRecords); } } public int TotalRecords { get { return Convert.ToInt32(ViewState[ " TotalRecords " ]); } set { ViewState[ " TotalRecords " ] = value; } } public string DataWrapperID { get { string s = ViewState[ " DataWrapperID " ] as string ; if (s == null ) { s = string .Empty; } return s; } set { ViewState[ " DataWrapperID " ] = value; } } public string TargetControlID { get { string s = ViewState[ " TargetControlID " ] as string ; if (s == null ) { s = string .Empty; } return s; } set { ViewState[ " TargetControlID " ] = value; } } #endregion #region Overrides Methods protected override void OnLoad(EventArgs e) { if ( ! Page.IsPostBack) { CreatePageLinks(); RegisterClientScripts(); } else { targetControl = FindControl( this , TargetControlID); } } protected override void Render(HtmlTextWriter writer) { if (TotalPages <= 1 ) { return ; } RenderFirst(writer); RenderPrevious(writer); RenderPagingButtons(writer); RenderNext(writer); RenderLast(writer); } #endregion #region Public Methods public virtual int CalculateTotalPages( int totalRecords) { int totalPagesAvailable; if (totalRecords == 0 ) { return 0 ; } totalPagesAvailable = totalRecords / PageSize; if ((totalRecords % PageSize) > 0 ) { totalPagesAvailable ++ ; } return totalPagesAvailable; } #endregion #region ICallbackEventHandler Implementation public void RaiseCallbackEvent( string pageIndex) { int currentPageIndex = int .Parse(pageIndex); if (currentPageIndex != PageIndex) { ((IPageIndexChangedEventHandler)targetControl).BindData(currentPageIndex, PageSize); } PageIndex = currentPageIndex; CreatePageLinks(); } public string GetCallbackResult() { return RenderControl(targetControl); } #endregion #region Helpers private void RenderFirst(HtmlTextWriter writer) { if ((PageIndex > LeftLength + 1 ) && (TotalPages > PageLength)) { firstLink.RenderControl(writer); LiteralControl l = new LiteralControl( "  ...  " ); l.RenderControl(writer); } } private void RenderLast(HtmlTextWriter writer) { if (((PageIndex + RightLength) < TotalPages) && (TotalPages > PageLength)) { LiteralControl l = new LiteralControl( "  ...  " ); l.RenderControl(writer); lastLink.RenderControl(writer); } } private void RenderPrevious(HtmlTextWriter writer) { if (PageIndex > 1 ) { previousLink.RenderControl(writer); Literal l = new Literal(); l.Text = "   " ; l.RenderControl(writer); } } private void RenderNext(HtmlTextWriter writer) { if (PageIndex < TotalPages) { Literal l = new Literal(); l.Text = "   " ; l.RenderControl(writer); nextLink.RenderControl(writer); } } private void RenderButtonRange( int start, int end, HtmlTextWriter writer) { for ( int i = start; i <= end; i ++ ) { if (PageIndex == i) { Literal l = new Literal(); // l.Text = "<span class=\"currentPage\">[" + i.ToString() + "]</span>"; l.Text = i.ToString(); l.RenderControl(writer); } else { Controls[i - start].RenderControl(writer); } if (i < end) { writer.Write( " " ); } } } private void RenderPagingButtons(HtmlTextWriter writer) { RenderButtonRange(lowerBound, upperBound, writer); } private string RenderControl(Control control) { StringWriter writer1 = new StringWriter(CultureInfo.InvariantCulture); HtmlTextWriter writer2 = new HtmlTextWriter(writer1); control.RenderControl(writer2); writer2.Flush(); writer2.Close(); return writer1.ToString(); } private string CreateOnClickScript( int pageIndex) { return string .Format( " javascript:turnPage({0}); " , pageIndex); } private void InitPageBounds() { lowerBound = PageIndex - LeftLength; upperBound = PageIndex + RightLength; if (lowerBound < 1 ) { upperBound += 1 - lowerBound; lowerBound = 1 ; } if (upperBound > TotalPages) { lowerBound -= upperBound - TotalPages; upperBound = TotalPages; } if (lowerBound < 1 ) { lowerBound = 1 ; } if (upperBound > TotalPages) { upperBound = TotalPages; } } private void AddPageLinks() { InitPageBounds(); HyperLink link; for ( int i = lowerBound; i <= upperBound; i ++ ) { link = new HyperLink(); link.EnableViewState = false ; link.Text = i.ToString(); link.ID = i.ToString(); link.NavigateUrl = CreateOnClickScript(i); Controls.Add(link); } } private void AddFirstLastLinks() { firstLink = new HyperLink(); firstLink.ID = " First " ; firstLink.Text = " 第一页 " ; firstLink.NavigateUrl = CreateOnClickScript( 1 ); Controls.Add(firstLink); lastLink = new HyperLink(); lastLink.ID = " Last " ; lastLink.Text = " 最后一页 " ; lastLink.NavigateUrl = CreateOnClickScript(TotalPages); Controls.Add(lastLink); } private void AddPreviousNextLinks() { previousLink = new HyperLink(); previousLink.ID = " Prev " ; previousLink.Text = " 上一页 " ; previousLink.NavigateUrl = CreateOnClickScript(PageIndex - 1 ); Controls.Add(previousLink); nextLink = new HyperLink(); nextLink.ID = " Next " ; nextLink.Text = " 下一页 " ; nextLink.NavigateUrl = CreateOnClickScript(PageIndex + 1 ); Controls.Add(nextLink); } private void CreatePageLinks() { Controls.Clear(); AddPageLinks(); AddPreviousNextLinks(); AddFirstLastLinks(); } private void RegisterClientScripts() { string turnPageScript = " function turnPage(pageIndex) { CallServer(pageIndex,' " + DataWrapperID + " ');} " ; string receiveCallBackScript = " function ReceiveCallback(arg,context){ document.getElementById(context).innerHTML = arg; } " ; string callbackReference = Page.ClientScript.GetCallbackEventReference( this , " arg " , " ReceiveCallback " , " context " , false ); Page.ClientScript.RegisterClientScriptBlock( this .GetType(), this .ClientID + " TurnPageScript " , turnPageScript, true ); Page.ClientScript.RegisterClientScriptBlock( this .GetType(), this .ClientID + " ReceiveCallBackScript " , receiveCallBackScript, true ); Page.ClientScript.RegisterClientScriptBlock( this .GetType(), this .ClientID + " CallServer " , string .Format( " function CallServer(arg,context){{ {0} }} " , callbackReference), true ); } static Control FindControl(Control container, string id) { if ((container == null ) || string .IsNullOrEmpty(id)) { return null ; } if ( ! (container is INamingContainer) && (container.NamingContainer != null )) { container = container.NamingContainer; } Control control = FindControlInternal(container, id, null ); if (control == null ) { Dictionary < Control, bool > dictionary = new Dictionary < Control, bool > (); dictionary[container] = true ; container = container.NamingContainer; while ((container != null ) && (control == null )) { control = FindControlInternal(container, id, dictionary); dictionary[container] = true ; container = container.NamingContainer; } } return control; } static Control FindControlInternal(Control control1, string text1, Dictionary < Control, bool > dictionary1) { if (control1.ID == text1) { return control1; } Control control = control1.FindControl(text1); if ((control != null ) && (control.ID == text1)) { return control; } foreach (Control control2 in control1.Controls) { if ((dictionary1 == null ) || ! dictionary1.ContainsKey(control2)) { control = FindControlInternal(control2, text1, dictionary1); if (control != null ) { return control; } } } return null ; } #endregion }}

                <nwap:AjaxPager ID="pager" PageLength="50" TargetControlID="StudentList" DataWrapperID="container" runat="server" PageSize="10" />

View Code public List < Student > GetStudents( int pageIndex, int pageSize, ref int totalCount) { int lowerIndex = (pageIndex - 1 ) * pageSize + 1 ; int upperIndex = pageIndex * pageSize; List < Student > students = new List < Student > (); OleDbConnection conn = new OleDbConnection(); conn.ConnectionString = @" Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\TDOWN\源码\ASP.NET AJAX无刷新分页演示包（含控件）\codefans.net\Demo\db.mdb;Jet OLEDB:Database Password=;Persist Security Info=False " ; OleDbCommand cmd = conn.CreateCommand(); conn.Open(); cmd.CommandText = " select count(*) from students " ; totalCount = ( int )cmd.ExecuteScalar(); cmd.CommandText = string .Format( " select * from students where id >= {0} and id <= {1} " , lowerIndex, upperIndex); OleDbDataReader reader = cmd.ExecuteReader(); Student student = null ; while (reader.Read()) { student = new Student(); student.Id = ( int )reader[ 0 ]; student.Name = ( string )reader[ 1 ]; student.Age = ( int )reader[ 2 ]; students.Add(student); } reader.Close(); reader.Dispose(); conn.Close(); conn.Dispose(); return students; }

转载于:https://www.cnblogs.com/Mr0909/archive/2011/05/19/2051479.html

相关资源：一个比较简单的PHP 分页分组类