net分页控件发布

由于.net自带的分页功能极其死板，自定义性不强不能满足需求
俺花了一个多星期的时间 写成的一个.net分页控件

特性:
1、支持datagrid,datalist等分种数据显示控件，理论上只要有datasource的控件都可以
2、支持url方式分页，url分页的每一页都可以被搜索引擎搜到，并且支持url重写
3、控件样式可自定义
4、封装完全，使用过程序只需写一行代码

/**//******************************************************************
 ** 文件名:pager.cs
 ** 创建人:杨响武
 ** 日 期:2005年7月27日
 ** 修改人:
 ** 日 期:
 ** 描 述:
 **
 **----------------------------------------------------------------
 ******************************************************************/
 
 using system;
 using system.web.ui.webcontrols;
 using system.web.ui.htmlcontrols;
 using system.web;
 using system.web.ui;
 using system.text.regularexpressions;
 
 namespace mycompany.controls
 {
     // <summary>
     // 分页控件
     // </summary>
     public class pager : label, inamingcontainer 
     {
         成员变量和构造函数#region 成员变量和构造函数
         httpcontext context = httpcontext.current;
         label countlabel;
         hyperlink previousbutton;
         hyperlink nextbutton;
         hyperlink firstbutton;
         hyperlink lastbutton;
         hyperlink[] paginglinkbuttons;
         
         public override controlcollection controls
         {
             get
             {
                 ensurechildcontrols();
                 return base.controls;
             }
         }
 
         protected override void createchildcontrols()
         {
             controls.clear();
 
             addcountlabel();
 
             addpagebuttons();
 
             addpreviousnexthyperlinks();
 
             addfirstlasthyperlinks();
         }
         #endregion
 
         呈现方法#region 呈现方法
         protected override void render(htmltextwriter writer) 
         {
 /            修改总页数小于等于1的时候不呈现任何控件
 /            int totalpages = calculatetotalpages();
 /
 /            if (totalpages <= 1)
 /                return;
 
             addattributestorender(writer);
 
             writer.addattribute(htmltextwriterattribute.class, this.cssclass, false); 
 
             rendercountlabel(writer);
 
             renderfirst(writer);
 
             renderprevious(writer);
 
             renderpagingbuttons(writer);
             
             rendernext(writer);
 
             renderlast(writer);
         }
 
         void rendercountlabel(htmltextwriter writer)
         {
             countlabel.rendercontrol(writer);
 
             literalcontrol l = new literalcontrol("!amp;nbsp;");
             l.rendercontrol(writer);
         }
 
         void renderfirst (htmltextwriter writer)
         {
             firstbutton.rendercontrol(writer);
 
             literalcontrol l = new literalcontrol("!amp;nbsp;");
             l.rendercontrol(writer);
         }
 
         void renderlast (htmltextwriter writer)
         {
             lastbutton.rendercontrol(writer);
 
             literalcontrol l = new literalcontrol("!amp;nbsp;");
             l.rendercontrol(writer);
         }
 
         void renderprevious (htmltextwriter writer)
         {
             previousbutton.rendercontrol(writer);
 
             literalcontrol l = new literalcontrol("!amp;nbsp;");
             l.rendercontrol(writer);
         }
 
         void rendernext(htmltextwriter writer)
         {
             nextbutton.rendercontrol(writer);
 
             literalcontrol l = new literalcontrol("!amp;nbsp;");
             l.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 = "<font color =red>" + (i + 1).tostring() + "</font>";
 
                     l.rendercontrol(writer);
                 }
                 else
                 {
                     paginglinkbuttons[i].rendercontrol(writer);
                 }
                 if (i < (end - 1))
                     writer.write("!amp;nbsp;");
             }
 
             literalcontrol l1 = new literalcontrol("!amp;nbsp;");
             l1.rendercontrol(writer);
         }
 
         private void renderpagingbuttons(htmltextwriter writer)
         {
             int totalpages;
 
             totalpages = calculatetotalpages();
 
             if (totalpages <= 10)
             {
                 renderbuttonrange(0, totalpages, writer);
             }
             else
             {
                 int lowerbound = (pageindex - 4);
                 int upperbount = (pageindex + 6);
 
                 if (lowerbound <= 0)
                     lowerbound = 0;
 
                 if (pageindex <= 4)
                     renderbuttonrange(0, 10, writer);
 
                 else if (pageindex < (totalpages - 5))
                     renderbuttonrange(lowerbound, (pageindex + 6), writer);
 
                 else if (pageindex >= (totalpages - 5))
                     renderbuttonrange((totalpages - 10), totalpages, writer);
             }
         }
 
         #endregion
 
         控件树方法#region 控件树方法
         // <summary>
         // 信息标签
         // </summary>
         void addcountlabel()
         {
             countlabel = new label();
             countlabel.id = "countlabel";
             countlabel.text = string.format(text, calculatetotalpages().tostring("n0"));
 
             controls.add(countlabel);
         }
 
         private void addpagebuttons()
         {
             paginglinkbuttons = new hyperlink[calculatetotalpages()];
 
             for (int i = 0; i < paginglinkbuttons.length; i++)
             {
                 paginglinkbuttons[i] = new hyperlink();
                 paginglinkbuttons[i].enableviewstate = false;
                 paginglinkbuttons[i].text = (i + 1).tostring();
                 paginglinkbuttons[i].id = i.tostring();
                 paginglinkbuttons[i].cssclass = linkcss;
                 paginglinkbuttons[i].navigateurl = gethrefstring(i);
 
                 controls.add(paginglinkbuttons[i]);
             }
         }
 
         // <summary>
         // 首页末页
         // </summary>
         void addfirstlasthyperlinks()
         {
             firstbutton = new hyperlink();
             firstbutton.id = "first";
             firstbutton.text = "首页";
             if(pageindex != 0 !amp;!amp; calculatetotalpages() > 0)
             {
                 firstbutton.navigateurl = gethrefstring(0);
             }
             else
             {
                 firstbutton.enabled = false;
             }
             
             controls.add(firstbutton);
 
             lastbutton = new hyperlink();
             lastbutton.id = "last";
             lastbutton.text = "末页";
             if(pageindex != calculatetotalpages() - 1)
             {
                 lastbutton.navigateurl = gethrefstring(calculatetotalpages() - 1);
             }
             else
             {
                 lastbutton.enabled = false;
             }
             controls.add(lastbutton);
         }
 
         // <summary>
         // 上一页下一页
         // </summary>
         void addpreviousnexthyperlinks()
         {
             previousbutton = new hyperlink();
             previousbutton.id = "prev";
             previousbutton.text = "上一页";
             if (hasprevious)
             {
                 previousbutton.navigateurl = gethrefstring(pageindex - 1);
             }
             else
             {
                 previousbutton.enabled = false;
             }
             controls.add(previousbutton);
 
             nextbutton = new hyperlink();
             nextbutton.id = "next";
             nextbutton.text = "下一页";
             if(hasnext)
             {
                 nextbutton.navigateurl = gethrefstring(pageindex + 1);
             }
             else
             {
                 nextbutton.enabled = false;
             }
             controls.add(nextbutton);
         }
         #endregion
 
         私有属性#region 私有属性
         private bool hasprevious
         {
             get
             {
                 if (pageindex > 0)
                     return true;
 
                 return false;
             }
         }
 
         private bool hasnext
         {
             get
             {
                 if (pageindex + 1 < calculatetotalpages() )
                     return true;
 
                 return false;
             }
         }
         #endregion
 
         帮助方法和公共属性#region 帮助方法和公共属性
         
         // <summary>
         // 获取分页导航按钮的超链接字符串
         // </summary>
         // <param name="pageindex">该分页按钮相对应的页索引</param>
         // <returns>分页导航按钮的超链接字符串</returns>
         private string gethrefstring(int pageindex)
         {
             string url = page.request.rawurl;
 
             if (regex.ismatch(url, @"(\d+).shtml", regexoptions.ignorecase))
             {
                 url = regex.replace(url, @"(\d+).shtml", pageindex + ".shtml");
             }
 
             if (regex.ismatch(url, @"pageindex=(\d+)", regexoptions.ignorecase))
             {
                 url = regex.replace(url, @"pageindex=(\d+)", "pageindex=" + pageindex.tostring());
             }
 
             return page.server.urlpathencode(url);
         }
 
         public int calculatetotalpages()
         {
             int totalpagesavailable;
 
             if (totalrecords == 0)
                 return 0;
 
             totalpagesavailable = totalrecords / pagesize;
 
             if ((totalrecords % pagesize) > 0)
                 totalpagesavailable++;
 
             return totalpagesavailable;
         }
 
         // <summary>
         // 当前页
         // </summary>
         public int pageindex
         {
             get
             {
                 int _pageindex = 0;
 
                 if ((!page.ispostback) !amp;!amp; (context.pageindex > 0))
                     _pageindex = context.pageindex;
                 else
                     _pageindex = convert.toint32(viewstate["pageindex"]);
 
                 if (_pageindex < 0)
                     return 0;
                 else
                 {
                     if (_pageindex > calculatetotalpages()-1)
                         return calculatetotalpages()-1;
                     else
                         return _pageindex;
                 }
             }
             set
             {
                 viewstate["pageindex"] = value;
             }
         }
 
         // <summary>
         // 每页记录数
         // </summary>
         public int pagesize
         {
             get
             {
                 int pagesize = convert.toint32(viewstate["pagesize"]);
 
                 if (pagesize == 0)
                 {
                     return 10;
                 }
 
                 return pagesize;
             }
             set
             {
                 viewstate["pagesize"] = value;
             }
 
         }
 
         // <summary>
         // 总记录数
         // </summary>
         public int totalrecords
         {
             get
             {
                 return convert.toint32(viewstate["totalrecords"]);
             }
             set
             {
                 viewstate["totalrecords"] = value;
             }
         }
 
         private string text = "共{0}页";
 
         private string linkcss = "";
         // <summary>
         // 链接样式
         // </summary>
         public string linkcss
         {
             get { return linkcss; }
             set { linkcss = value;}
         }
 
         private string textcss = "";
         // <summary>
         // 文字样式
         // </summary>
         public string textcss
         {
             get { return textcss; }
             set { textcss = value;}
         }
 
         public string textformat 
         {
             get
             {
                 return text;
             }
             set 
             {
                 text = value;
             }
         }
 
         #endregion
     }
 }

在页面上只需要向下面这样写：
1 <%@ control language="c#" %>
2 <%@ register tagprefix="anchor" namespace="mycompany.controls" assembly="mycompany.controls" %>
3 <anchor:pager id="pager1" runat="server"></anchor:pager>