asp.net 分页-自己写分页控件

　　去年就发表过asp.net 分页-利用后台直接生成html分页 ,那种方法只是单纯的实现了分页，基本不能使用,那时就想写个自己的分页控件，无奈能力有限。最近有点时间了，就自己做出了这个分页控件。我承认，这个控件参考了别人的，但是其实里面的原理都相同，差异只是展现方式而已。

　　去年就在做一个自己的后台系统，刚开始用的asp.net，做了一部分就没有做了，因为缺少权限控制类别。后面转为用asp.net mvc4做，也只是做了一部分，觉得不太方便，也许是我不太会用。再用ajax+ashx做了一部分，虽然体验不错，但是我还是放弃了，比起纯正的asp.net还是麻烦多了。我要做的系统不是很大，觉得用asp.net很方便，权限控制，通用控件可以加快步伐。所以我决定先做出来再说，怎么简单怎么做。

展示效果

属性解释：

Css:定义div和链接等的样式

SelectCss：当前选择的链接样式

CssEnable：本来想做一个默认的样式，但是感觉需要不大，所以这个属性暂时无用

PageSize：每页显示的数据条数

PreNextVisable：上一页和下一页的显示，默认为显示

TotalVisable：显示总数，默认为不显示，图上显示错误：共{0}笔

运行效果：

实现过程

//****************************************************************************************
//作者：轻狂书生
//博客地址：http://www.cnblogs.com/xiaoshuai1992
//create: 2014/5/5
//功能：分页控件的实现
//使用方法：正常控件使用方法
//*****************************************************************************************

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.ComponentModel;
[assembly: TagPrefix("XS.Framework.Control", "xs")]
namespace pageControl
{
    public class PageChangedEventArgs : EventArgs
    {
        int ITotalCount = ;
        int ICurrentPage = ;
        int IPageSize = ;
        public int ECurrentPage
        {
            get { return ICurrentPage; }
            set { ICurrentPage = value; }
        }
        public int ETotalCount
        {
            get { return ITotalCount; }
            set { ITotalCount = value; }
        }
        public int EPageSize
        {
            get { return IPageSize; }
            set { IPageSize = value; }
        }
        public PageChangedEventArgs(int curPage, int totalcount, int pageSize)
        {
            ECurrentPage = curPage;
            ETotalCount = totalcount;
            EPageSize = pageSize;
        }
    }
    public delegate void PageChangedEvent(object sender, PageChangedEventArgs e);
    public class xsPageControl : Control, IPostBackEventHandler
    {
        #region 属性
        string _preText = "上一页";
        string _nextText = "下一页";
        string _totalText = "共{0}笔";
        bool _totalVisable = false;//由于存在尾页号，总页数不是必须，故这里我设置默认为不打开
        bool _preNextVisable = true;
        int _pageSize = ;
        string _css = "xsPage";
        string _selectCss = "xsSelect";
        bool _cssEnable = true;
        int ITotalCount = ;
        int ICurrentPage = ;

        [Category("Text")]
        public string PreText
        {
            get { return _preText; }
            set { _preText = value; }
        }
        [Category("Text")]
        public string NextText
        {
            get { return _nextText; }
            set { _nextText = value; }
        }
        [Category("Text")]
        public string TotalText
        {
            get { return _totalText; }
            set { _totalText = value; }
        }
        [Category("Text")]
        public bool TotalVisable
        {
            get { return _totalVisable; }
            set { _totalVisable = value; }
        }
        [Category("Text")]
        public bool PreNextVisable
        {
            get { return _preNextVisable; }
            set { _preNextVisable = value; }
        }

        [Category("Size")]
        public int PageSize
        {
            get { return _pageSize; }
            set { _pageSize = value; }
        }
        [Category("CSS")]
        public string Css
        {
            get { return _css; }
            set { _css = value; }
        }
        [Category("CSS")]
        public string SelectCss
        {
            get { return _selectCss; }
            set { _selectCss = value; }
        }
        [Category("CSS")]
        /// <summary>
        /// 是否使用默认CSS,自定义CSS无效
        /// </summary>
        public bool CssEnable
        {
            get { return _cssEnable; }
            set { _cssEnable = value; }
        }
        [Browsable(false)]
        public int CurrentPage
        {
            set { ICurrentPage = value; }
        }
        [Browsable(false)]
        public int TotalPage
        {
            get
            {
                int tpage = ;
                if (PageSize > )
                {
                    tpage = (TotalCount % PageSize ==  ? TotalCount / PageSize : TotalCount / PageSize + );
                }
                return tpage;

            }
        }
        [Browsable(false)]
        public int TotalCount
        {
            get { return ITotalCount; }
            set { ITotalCount = value; }
        }
        #endregion

        public event PageChangedEvent PageChanged;

        #region 效果呈现
        public override void RenderControl(HtmlTextWriter writer)
        {
            Render(writer);
        }

        protected override void Render(HtmlTextWriter writer)
        {
            if (DesignMode)
            {
                writer.AddAttribute(HtmlTextWriterAttribute.Id, this.ClientID);
                writer.AddAttribute(HtmlTextWriterAttribute.Name, this.UniqueID);
                writer.AddAttribute(HtmlTextWriterAttribute.Class, Css);
                writer.RenderBeginTag(HtmlTextWriterTag.Div);

                if (TotalVisable)
                {
                    writer.RenderBeginTag(HtmlTextWriterTag.Span);
                    writer.Write(string.Format(TotalText, ));
                    writer.RenderEndTag();
                    writer.Write("&nbsp;&nbsp;");
                }
                if (PreNextVisable)
                {
                    writer.AddAttribute(HtmlTextWriterAttribute.Href, "#");
                    writer.RenderBeginTag(HtmlTextWriterTag.A);
                    writer.Write(PreText);
                    writer.RenderEndTag();
                    writer.Write("&nbsp;&nbsp;");
                }
                for (int i = ; i <= ; i++)
                {
                    writer.AddAttribute(HtmlTextWriterAttribute.Href, "#");
                    writer.RenderBeginTag(HtmlTextWriterTag.A);
                    writer.Write(i.ToString());
                    writer.RenderEndTag();
                    writer.Write("&nbsp;&nbsp;");
                }
                if (PreNextVisable)
                {
                    writer.AddAttribute(HtmlTextWriterAttribute.Href, "#");
                    writer.RenderBeginTag(HtmlTextWriterTag.A);
                    writer.Write(NextText);
                    writer.RenderEndTag();
                    writer.Write("&nbsp;&nbsp;");
                }
                writer.RenderEndTag();
            }
            else
            {
                writer.AddAttribute(HtmlTextWriterAttribute.Id, this.ClientID);
                writer.AddAttribute(HtmlTextWriterAttribute.Name, this.UniqueID);
                writer.AddAttribute(HtmlTextWriterAttribute.Class, Css);
                writer.RenderBeginTag(HtmlTextWriterTag.Div);

                if (TotalVisable)
                {
                    writer.RenderBeginTag(HtmlTextWriterTag.Span);
                    writer.Write(string.Format(TotalText, ITotalCount));
                    writer.RenderEndTag();
                }
                if (PreNextVisable && ICurrentPage != )
                {
                    writer.AddAttribute(HtmlTextWriterAttribute.Href, "javascript:" + Page.ClientScript.GetPostBackEventReference(this, ICurrentPage -  + ""));
                    writer.RenderBeginTag(HtmlTextWriterTag.A);
                    writer.Write(PreText);
                    writer.RenderEndTag();
                }
                if (TotalPage <= )
                {
                    for (int i = ; i <= TotalPage; i++)
                    {
                        if (i == ICurrentPage)
                        {
                            //添加当前选择的样式
                            writer.AddAttribute(HtmlTextWriterAttribute.Class, SelectCss);
                        }
                        writer.AddAttribute(HtmlTextWriterAttribute.Href, "javascript:" + Page.ClientScript.GetPostBackEventReference(this, i + ""));
                        writer.RenderBeginTag(HtmlTextWriterTag.A);
                        writer.Write(i.ToString());
                        writer.RenderEndTag();
                    }
                }
                else
                {
                    if (ICurrentPage -  >  && ICurrentPage +  < TotalPage)//前后都有的
                    {
                        //添加第一页
                        writer.AddAttribute(HtmlTextWriterAttribute.Href, "javascript:" + Page.ClientScript.GetPostBackEventReference(this,  + ""));
                        writer.RenderBeginTag(HtmlTextWriterTag.A);
                        writer.Write("");
                        writer.RenderEndTag();

                        writer.RenderBeginTag(HtmlTextWriterTag.Span);
                        writer.Write("…");
                        writer.RenderEndTag();

                        for (int i = ICurrentPage - ; i <= ICurrentPage + ; i++)
                        {
                            if (i == ICurrentPage)
                            {
                                //添加当前选择的样式
                                writer.AddAttribute(HtmlTextWriterAttribute.Class, SelectCss);
                            }
                            writer.AddAttribute(HtmlTextWriterAttribute.Href, "javascript:" + Page.ClientScript.GetPostBackEventReference(this, i + ""));
                            writer.RenderBeginTag(HtmlTextWriterTag.A);
                            writer.Write(i.ToString());
                            writer.RenderEndTag();
                        }
                        //添加最后一页
                        writer.RenderBeginTag(HtmlTextWriterTag.Span);
                        writer.Write("…");
                        writer.RenderEndTag();
                        writer.AddAttribute(HtmlTextWriterAttribute.Href, "javascript:" + Page.ClientScript.GetPostBackEventReference(this, TotalPage + ""));
                        writer.RenderBeginTag(HtmlTextWriterTag.A);
                        writer.Write(TotalPage.ToString());
                        writer.RenderEndTag();
                    }
                    else if (ICurrentPage -  <= )//前面不够，后面有多余
                    {
                        for (int i = ; i <= ; i++)
                        {
                            if (i == ICurrentPage)
                            {
                                //添加当前选择的样式
                                writer.AddAttribute(HtmlTextWriterAttribute.Class, SelectCss);
                            }
                            writer.AddAttribute(HtmlTextWriterAttribute.Href, "javascript:" + Page.ClientScript.GetPostBackEventReference(this, i + ""));
                            writer.RenderBeginTag(HtmlTextWriterTag.A);
                            writer.Write(i.ToString());
                            writer.RenderEndTag();
                        }
                        //添加最后一页
                        writer.RenderBeginTag(HtmlTextWriterTag.Span);
                        writer.Write("…");
                        writer.RenderEndTag();
                        writer.AddAttribute(HtmlTextWriterAttribute.Href, "javascript:" + Page.ClientScript.GetPostBackEventReference(this, TotalPage + ""));
                        writer.RenderBeginTag(HtmlTextWriterTag.A);
                        writer.Write(TotalPage.ToString());
                        writer.RenderEndTag();

                    }
                    else if (ICurrentPage +  >= TotalPage)//前面多余，后面不足
                    {
                        //添加第一页
                        writer.AddAttribute(HtmlTextWriterAttribute.Href, "javascript:" + Page.ClientScript.GetPostBackEventReference(this,  + ""));
                        writer.RenderBeginTag(HtmlTextWriterTag.A);
                        writer.Write("");
                        writer.RenderEndTag();
                        writer.RenderBeginTag(HtmlTextWriterTag.Span);
                        writer.Write("…");
                        writer.RenderEndTag();
                        for (int i = TotalPage - ; i <= TotalPage; i++)
                        {
                            if (i == ICurrentPage)
                            {
                                //添加当前选择的样式
                                writer.AddAttribute(HtmlTextWriterAttribute.Class, SelectCss);
                            }
                            writer.AddAttribute(HtmlTextWriterAttribute.Href, "javascript:" + Page.ClientScript.GetPostBackEventReference(this, i + ""));
                            writer.RenderBeginTag(HtmlTextWriterTag.A);
                            writer.Write(i.ToString());
                            writer.RenderEndTag();
                        }
                    }

                }
                if (PreNextVisable && ICurrentPage != TotalPage && TotalPage > )
                {
                    writer.AddAttribute(HtmlTextWriterAttribute.Href, "javascript:" + Page.ClientScript.GetPostBackEventReference(this, ICurrentPage +  + ""));
                    writer.RenderBeginTag(HtmlTextWriterTag.A);
                    writer.Write(NextText);
                    writer.RenderEndTag();
                }
                writer.RenderEndTag();
            }
        }

        #endregion

        /// <summary>
        /// 设置翻页
        /// </summary>
        /// <param name="gotoPage"></param>
        protected virtual void OnPageChanged(int gotoPage)
        {
            PageChangedEventArgs e = new PageChangedEventArgs(gotoPage, TotalCount, PageSize);
            if (this.PageChanged != null)
            {
                PageChanged(this, e);
                CurrentPage = e.ECurrentPage;
                TotalCount = e.ETotalCount;
                PageSize = e.EPageSize;
            }
        }
        public void RaisePostBackEvent(string eventArgument)
        {
            int gotopage = Convert.ToInt32(eventArgument);
            OnPageChanged(gotopage);
        }

        /// <summary>
        /// 第一次进入页面需要显示调用
        /// </summary>
        public void StartShowPage()
        {
            OnPageChanged();
        }
        /// <summary>
        /// 删除或更新后可以直接刷新
        /// </summary>
        public void RefreshPage()
        {
            OnPageChanged(ICurrentPage);
        }
    }
}

重要代码解释，其他可以看注释

1：控件继承自Control, IPostBackEventHandler

链接调用的为Page.ClientScript.GetPostBackEventReference（）方法,点击时进入RaisePostBackEvent 方法

RaisePostBackEvent 方法实现接口IPostBackEventHandler，在进入页面时进入调用OnPageChanged（）方法实现分页

2：PageChangedEventArgs 类

定义为PageChanged的参数，可以把当前的页数，总数，每页显示数带到页面进行查询，也可以在页面设置这些属性,实现控件的显示

页面使用

拖入控件，设置好属性,把要实现的数据查询和绑定写在pagechanged里面，参数里面包含了分页的参数（当前页数,每页显示数）

 protected void xsPageControl1_PageChanged(object sender, PageChangedEventArgs e)
{
}

进入页面地方使用

 xsPageControl1.StartShowPage();

页面数据修改或删除后刷新当页

xsPageControl1.RefreshPage();

源码下载

pageControl.zip

以后还会对其进行修改和完善,也可以写一下类别配合其使用,这个控件没有与其他控件关联，也没用和数据库关联，可以自行对任意需要分页显示的控件进行分页。

20140508修改

几天的测试发现了里面的bug

当前页面的刷新会找不到当前的页数，是因为页面刷新后控件类重新生成，当前页面的值也就回到了原点。

所以我考虑把CurrentPage 这个属性变为用页面缓存进行保存，经测试成功

 public int CurrentPage
        {
            get { return Convert.ToInt32(ViewState[UniqueID + "xsCurrentPage"] == null ?  : ViewState[UniqueID + "xsCurrentPage"]); }
            set { ViewState[UniqueID + "xsCurrentPage"] = value; }
        }

20140509修改

昨天发现了一个bug，如果数据有6条，每页显示5条。我这时选到第二页，删除第6条，调用RefreshPage（）是当前页面记录的2，可是由于删除其实没有第二页了。

解决办法是在OnPageChanged 发生后判断总页数和当前页，如果当前页大于总页数，执行OnPageChanged(总页数)。这样可以解决，可是得查询2遍了