分页控件

　　最近在公司的项目开发中写的一个分页控件

     后台代码：

   

using System;
using System.Collections;
using System.Data;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace LMS.CommonLib.UI
{
    [Serializable]
    public class PageArgs : EventArgs
    {
        public PageArgs()
        {
        }

        private int _currentPageIndex;
        public int CurrentPageIndex
        {
            get
            {
                return _currentPageIndex;
            }
            set
            {
                _currentPageIndex = value;
            }
        }
    }
    public delegate void EventPageIndex(Object sender, PageArgs e);

    [DefaultProperty("RecordCount")]
    [ToolboxData("<{0}:Pager runat=server></{0}:Pager>")]
    public class Pager : WebControl, IPostBackEventHandler
    {
        #region Event
        public event EventPageIndex PageChange;  //页更改事件

        public virtual void OnPageChange(Object sender, PageArgs e)
        { 
            if(PageChange!=null)
            {
                PageChange(this, e);
            }
        }

        public void RaisePostBackEvent(string eventArgument)
        {
            this.CurrentPageIndex = Int32.Parse(System.Web.HttpContext.Current.Request.Form[this.UniqueID].ToString());
            PageArgs e = new PageArgs();
            e.CurrentPageIndex = this.CurrentPageIndex;
            OnPageChange(this, e);
        }
        #endregion Event
      
        #region private variables
       
        private int _pageCount;
        private int _recordCount;
        private int _currentPageIndex = 1;
        private int _pageSize = 15;

        #endregion

        #region Private properties
        /// <summary>
        /// Current page
        /// </summary>
        public int CurrentPageIndex
        {
            get
            {
                return (ViewState["CurrentPageIndex"] == null) ? 1 : (int)ViewState["CurrentPageIndex"];
            }
            set
            {
                _currentPageIndex = value;
                ViewState["CurrentPageIndex"] = value;
            }
        }

        /// <summary>
        /// Total pages
        /// </summary>
        private int PageCount
        {
            get
            {
                if ((RecordCount % PageSize) == 0)
                {
                    _pageCount = RecordCount / PageSize;
                }
                else
                {
                    _pageCount = RecordCount / PageSize + 1;
                }
                return _pageCount;
            }
        }

        #endregion Private properties

        #region Public properties

   
        /// <summary>
        /// Total Records
        /// </summary>
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public int RecordCount
        {
            get
            {
                return (ViewState["RecordCount"]==null)?0:(int)(ViewState["RecordCount"]);
            }

            set
            {
                _recordCount = value;
                ViewState["RecordCount"] = value;
            }
        }

        /// <summary>
        /// Records of per page
        /// </summary>
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public int PageSize
        {
            get
            {
                return (ViewState["PageSize"]==null)?1:(int)(ViewState["PageSize"]);
            }

            set
            {
                //EnsureChildControls();
                _pageSize = value;
                ViewState["PageSize"] = value;
            }
        }

        #endregion Public properties

        #region Methods


        protected override void OnPreRender(EventArgs e)
        {
            base.OnPreRender(e);
            string dopost = "<div>\n";
            dopost +=       "   <input type=\"hidden\" name=\"" + this.UniqueID + "\" id=\"__EVENTTARGET\" value=\"\" />\n";
            dopost +=       "</div>\n";
            dopost +=       "<script type=text/javascript>\n";
            dopost +=       "      function _doPost(cutomArg){\n";
            dopost +=       "          document.forms['form1']."+this.UniqueID+".value = cutomArg;\n";
            dopost +=       "          document.forms['form1'].submit();\n";
            dopost +=       "      }\n";
            dopost +=       "</script>\n";
            if (!Page.ClientScript.IsClientScriptIncludeRegistered(this.GetType(), "_doPost"))
            {
                Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "_doPost", dopost);
            }
        }

        public int PageNumber = 10;
        protected override void RenderContents(HtmlTextWriter writer)
        {
            writer.Write("<div class=\"" + this.CssClass + "\">\n");
            writer.Write("记录数:");
            writer.Write(RecordCount);
            writer.Write(" 总页数:");
            writer.Write(PageCount+" ");

            if (PageCount <= PageNumber)
            {
                if (CurrentPageIndex <= 1)
                {
                    writer.Write("<span class='disabled'> < </span>\n ");
                }
                else
                {
                    writer.Write("<a href=\"javascript:_doPost('" + (CurrentPageIndex - 1) + "')\"> < </a>\n ");
                }
                for (int i = 1; i <= PageCount; i++)
                {
                    if (i == CurrentPageIndex)
                    {
                        //writer.Write("<a href=\"javascript:_doPost('" + i + "')\">" + i + "</a>\n ");
                        writer.Write("<span class='current'>" + (i) + "</span>\n ");
                    }
                    else
                    {
                        writer.Write("<a href=\"javascript:_doPost('" + i + "')\">" + i + "</a>\n ");
                    }
                }
                if (CurrentPageIndex >= PageCount)
                {
                    writer.Write("<span class='disabled'> > </span>\n ");
                }
                else
                {
                    writer.Write("<a href=\"javascript:_doPost('" + (CurrentPageIndex + 1) + "')\"> > </a>\n");
                }
            }
            else
            {
                int basePageCount = 0;
                if ((CurrentPageIndex % PageNumber) == 0)
                {
                    basePageCount = CurrentPageIndex / PageNumber - 1;
                }
                else
                {
                    basePageCount = CurrentPageIndex / PageNumber; 
                }

                int lastPageCount = PageCount / PageNumber;

                if (CurrentPageIndex <= 1 )
                {
                    writer.Write("<span class='disabled'> < </span>\n ");
                }
                else
                {
                    writer.Write("<a href=\"javascript:_doPost('" + (CurrentPageIndex - 1) + "')\"> < </a>\n ");
                }
                if (lastPageCount == basePageCount)
                {
                    writer.Write("<a href=\"javascript:_doPost('" + 1 + "')\">" + 1 + "</a>\n ");
                    writer.Write("<span>" + "" + "</span>\n ");
                    for (int i = 1; i <= PageNumber; i++)
                    {
                        int number = basePageCount * PageNumber + i;
                        if (number > PageCount)
                        {
                            break;
                        }
                        if (number == CurrentPageIndex)
                        {
                            writer.Write("<span class='current'>" + (number) + "</span>\n ");
                        }
                        else
                        {
                            writer.Write("<a href=\"javascript:_doPost('" + number + "')\">" + number + "</a>\n ");
                        }
                    }
                }
                else if (0 == basePageCount)
                {
                    for (int i = 1; i <= PageNumber; i++)
                    {
                        int number = basePageCount * PageNumber + i;
                        if (number > PageCount)
                        {
                            break;
                        }
                        if (number == CurrentPageIndex)
                        {
                            writer.Write("<span class='current'>" + (number) + "</span>\n ");
                        }
                        else
                        {
                            writer.Write("<a href=\"javascript:_doPost('" + number + "')\">" + number + "</a>\n ");
                        }
                    }
                    writer.Write("<span>" + "" + "</span>\n ");
                    writer.Write("<a href=\"javascript:_doPost('" + PageCount + "')\">" + PageCount + "</a>\n ");
                }
                else
                {
                    writer.Write("<a href=\"javascript:_doPost('" + 1 + "')\">" + 1 + "</a>\n ");
                    writer.Write("<span>" + "" + "</span>\n ");
                    for (int i = 1; i <= PageNumber; i++)
                    {
                        int number = basePageCount * PageNumber + i;
                        if (number > PageCount)
                        {
                            break;
                        }
                        if (number == CurrentPageIndex)
                        {
                            writer.Write("<span class='current'>" + (number) + "</span>\n ");
                        }
                        else
                        {
                            writer.Write("<a href=\"javascript:_doPost('" + number + "')\">" + number + "</a>\n ");
                        }
                    }
                    writer.Write("<span>" + "" + "</span>\n ");
                    writer.Write("<a href=\"javascript:_doPost('" + PageCount + "')\">" + PageCount + "</a>\n ");

                }
                
                if (CurrentPageIndex != PageCount)
                {
                    writer.Write("<a href=\"javascript:_doPost('" + (CurrentPageIndex + 1) + "')\"> > </a>\n");
                }
                else
                {
                    writer.Write("<span class='disabled'> > </span>\n ");
                }
            }

            writer.Write("</div>\n");
        }
        #endregion Methods
    }
}

    前台测试页面：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="PageTest.aspx.cs" Inherits="Test_PageTest" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
    <style type="text/css">
    DIV.digg
        {
            padding-right: 3px;
            padding-left: 3px;
            padding-bottom: 3px;
            margin: 3px;
            padding-top: 3px;
            text-align: right;
        }
        DIV.digg A
        {
            border-right: #aaaadd 1px solid;
            padding-right: 5px;
            border-top: #aaaadd 1px solid;
            padding-left: 5px;
            padding-bottom: 2px;
            margin: 2px;
            border-left: #aaaadd 1px solid;
            color: #000099;
            padding-top: 2px;
            border-bottom: #aaaadd 1px solid;
            text-decoration: none;
        }
        DIV.digg A:hover
        {
            border-right: #000099 1px solid;
            border-top: #000099 1px solid;
            border-left: #000099 1px solid;
            color: #000;
            border-bottom: #000099 1px solid;
        }
        DIV.digg A:active
        {
            border-right: #000099 1px solid;
            border-top: #000099 1px solid;
            border-left: #000099 1px solid;
            color: #000;
            border-bottom: #000099 1px solid;
        }
        DIV.digg SPAN.current
        {
            border-right: #000099 1px solid;
            padding-right: 5px;
            border-top: #000099 1px solid;
            padding-left: 5px;
            font-weight: bold;
            padding-bottom: 2px;
            margin: 2px;
            border-left: #000099 1px solid;
            color: #fff;
            padding-top: 2px;
            border-bottom: #000099 1px solid;
            background-color: #000099;
        }
        DIV.digg SPAN.disabled
        {
            border-right: #eee 1px solid;
            padding-right: 5px;
            border-top: #eee 1px solid;
            padding-left: 5px;
            padding-bottom: 2px;
            margin: 2px;
            border-left: #eee 1px solid;
            color: #ddd;
            padding-top: 2px;
            border-bottom: #eee 1px solid;
        }
    
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:GridView ID="gvTest" runat="server">
    <Columns>
    
    </Columns>
    </asp:GridView>
    <Template:Pager  id="pager1" runat="server" PageSize="10"  CssClass="digg" OnPageChange="pager1_PageChange"  /> 
    <asp:TextBox id="txtQuery" runat="server"></asp:TextBox>
    <asp:Button ID="btnSearch" runat="server" OnClick="btnSearch_Click" />
    </div>
    </form>
</body>
</html>