自己写的一个Pager分页组件,WebForm，Mvc都适用
我一说写这个功能的时候，好多人估计有疑问。分页功能网上多的是，搜一个不就行了，你这样不是浪费时间么。你说这句话的时候，我是比较信的，首先自己写一些东西是很耗时，有这些时间又能多打几盘LOL了。但是我觉得有些东西需要你自己写了之后思路才清晰，一直认为知道一些原理才是最重要的，并且能让你更深入的去了解一门语言。就像好多人说“我精通JQuery框架”，那我想问你“有没有看过Jquery源码，知不知道它的实现原理和机制？”。熟练和精通不是同一个层次，首先熟练是你会使用一些框架的语法和用法，精通是指你知道其中的原理和机制，并且能够模仿并延伸一些知识。我说这话的意思是让大家带着一股钻研精神去学习一门语言，当做一种兴趣和爱好，而不仅仅是把它当做一个饭碗，混混日子那么简单。
说到这个功能，我不得不提一下一个叫杨涛的大叔，一个善于与别人分享资源的人,你可以称他为“分页达人”，写了各种分页的扩展，他的个人主页地址http://www.webdiyer.com/，大家没事可以看看，想必也有好多人用过他写的分页控件。
下面来说说正题，这个功能其实是我两年前写的，今天无意间看到，所以只是想和大家分享一下，另外也算是做个笔记，说下我的思路。
分页控件其实就是根据链接在页面间传递参数，因为我看到MVC中你可以看到这样传递参数的new {para=val}这种方式传递参数，于是我想到用可以模仿这种传递参数的方式，那就用dynamic来作为参数对象传递。
下面是附上我写的具体的实现的代码
数据处理代码：
1.定义IPagedList接口
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Infrastruction.Pager { public interface IPagedList { int pageIndex { get; set; } int pageSize { get; set; } int totalItemCount { get; set; } int totalPageCount { get; } } }
2.实现IPagedList接口
using System; using System.Collections.Generic; using System.Linq; using System.Web; namespace Infrastruction.Pager { public class PagedList<T> : List<T>, IPagedList { public int pageIndex { get; set; } public int pageSize { get; set; } public int totalItemCount { get; set; } public int totalPageCount { get { return totalItemCount % pageSize == 0 ? (totalItemCount / pageSize) : (totalItemCount / pageSize + 1); } } public PagedList(IEnumerable<T> sources, int pageIndex, int pageSize) { if (sources != null && sources.Any()) { this.AddRange(sources.Skip(pageSize * (pageIndex - 1)).Take(pageSize).ToList()); } this.pageIndex = pageIndex; this.pageSize = pageSize; this.totalItemCount = sources.Count(); } } }
分页标签处理代码：
3.PagerHelper
using Infrastruction.Pager; using System; using System.Collections.Generic; using System.Linq; using System.Reflection; using System.Text; using System.Web; using System.Web.UI; namespace System.Web.UI { public static class PagerHelper { public static string Pager(string url, IPagedList pagedList) { StringBuilder builder = new StringBuilder(); if (pagedList != null) { builder.Append("<script type='text/javascript'>"); builder.Append("window.onload = function () {"); builder.Append(" var elements = document.getElementById('pager').childNodes;"); builder.Append(" for (var i = 0; i < elements.length; i++) {"); builder.Append("var txt = elements[i].innerText || elements[i].textContent;"); builder.Append(" if (elements[i].nodeType =='1' && txt == '" + pagedList.pageIndex + "') {"); builder.Append("elements[i].style.textDecoration = 'underline';break; } } }"); builder.Append("</script>"); builder.Append("<div id='pager'>"); builder.Append("<span class='p'>"); builder.AppendFormat("共 {0} 条数据 页次：{1}/{2}", pagedList.totalItemCount, pagedList.pageIndex, pagedList.totalPageCount, "上一页"); builder.Append("</span>"); builder.Append(" "); builder.Append(" "); builder.Append(" "); builder.Append(" "); if (pagedList.pageIndex > 1 && pagedList.pageIndex <= pagedList.totalPageCount) { builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?pageIndex={1}'>{2}</a>", url, 1, "首页"); builder.Append("</span>"); builder.Append(" "); builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?pageIndex={1}'>{2}</a>", url, pagedList.pageIndex - 1, "上一页"); builder.Append("</span>"); builder.Append(" "); } if (pagedList.totalPageCount > 1 && pagedList.totalPageCount <= 10) { for (int i = 1; i <= pagedList.totalPageCount; i++) { builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?pageIndex={1}'>{2}</a>", url, i, i); builder.Append("</span>"); builder.Append(" "); } } else if (pagedList.totalPageCount > 10) { if (pagedList.pageIndex < 11) { for (int i = 1; i <= 10; i++) { builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?pageIndex={1}'>{2}</a>", url, i, i); builder.Append("</span>"); builder.Append(" "); } builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?pageIndex={1}'>{2}</a>", url, 11, "..."); builder.Append("</span>"); builder.Append(" "); } else { builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?pageIndex={1}'>{2}</a>", url, (pagedList.pageIndex - 6), "..."); builder.Append("</span>"); builder.Append(" "); if (pagedList.pageIndex >= 11 && pagedList.totalPageCount <= pagedList.pageIndex + 5) { for (int i = pagedList.pageIndex - 5; i <= pagedList.totalPageCount; i++) { builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?pageIndex={1}'>{2}</a>", url, i, i); builder.Append("</span>"); builder.Append(" "); } } else { for (int i = pagedList.pageIndex - 5; i <= pagedList.pageIndex + 5; i++) { builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?pageIndex={1}'>{2}</a>", url, i, i); builder.Append("</span>"); builder.Append(" "); } builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?pageIndex={1}'>{2}</a>", url, (pagedList.pageIndex + 6), "..."); builder.Append("</span>"); builder.Append(" "); } } } if (pagedList.pageIndex >= 1 && pagedList.pageIndex < pagedList.totalPageCount) { builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?pageIndex={1}'>{2}</a>", url, pagedList.pageIndex + 1, "下一页"); builder.Append("</span>"); builder.Append(" "); builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?pageIndex={1}'>{2}</a>", url, pagedList.totalPageCount, "尾页"); builder.Append("</span>"); builder.Append(" "); } builder.Append("</div>"); } return builder.ToString(); } public static string Pager(string url, IPagedList pagedList, dynamic objAttr) { StringBuilder builder = new StringBuilder(); if (pagedList != null) { builder.Append("<script type='text/javascript'>"); builder.Append("window.onload = function () {"); builder.Append(" var elements = document.getElementById('pager').childNodes;"); builder.Append(" for (var i = 0; i < elements.length; i++) {"); builder.Append("var txt = elements[i].innerText || elements[i].textContent;"); builder.Append(" if (elements[i].nodeType =='1' && txt == '" + pagedList.pageIndex + "') {"); builder.Append("elements[i].style.textDecoration = 'underline';break; } } }"); builder.Append("</script>"); string paras = ""; PropertyInfo[] infos = objAttr.GetType().GetProperties(); if (infos != null && infos.Any()) { foreach (var item in infos) { paras += string.Format("{0}={1}", item.Name, item.GetValue(objAttr, null)); paras += "&"; } } paras = paras + "pageIndex="; builder.Append("<div id='pager'>"); builder.Append("<span class='p'>"); builder.AppendFormat("共 {0} 条数据 页次：{1}/{2}", pagedList.totalItemCount, pagedList.pageIndex, pagedList.totalPageCount, "上一页"); builder.Append("</span>"); builder.Append(" "); builder.Append(" "); builder.Append(" "); builder.Append(" "); if (pagedList.pageIndex > 1 && pagedList.pageIndex <= pagedList.totalPageCount) { builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?{1}'>{2}</a>", url, paras + 1, "首页"); builder.Append("</span>"); builder.Append(" "); builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?{1}'>{2}</a>", url, paras + (pagedList.pageIndex - 1), "上一页"); builder.Append("</span>"); builder.Append(" "); } if (pagedList.totalPageCount > 1 && pagedList.totalPageCount <= 10) { for (int i = 1; i <= pagedList.totalPageCount; i++) { builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?{1}'>{2}</a>", url, paras + i, i); builder.Append("</span>"); builder.Append(" "); } } else if (pagedList.totalPageCount > 10) { if (pagedList.pageIndex < 11) { for (int i = 1; i <= 10; i++) { builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?{1}'>{2}</a>", url, paras + i, i); builder.Append("</span>"); builder.Append(" "); } builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?{1}'>{2}</a>", url, paras + 11, "..."); builder.Append("</span>"); builder.Append(" "); } else { builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?{1}'>{2}</a>", url, paras + (pagedList.pageIndex - 6), "..."); builder.Append("</span>"); builder.Append(" "); if (pagedList.pageIndex >= 11 && pagedList.totalPageCount <= pagedList.pageIndex + 5) { for (int i = pagedList.pageIndex - 5; i <= pagedList.totalPageCount; i++) { builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?{1}'>{2}</a>", url, paras + i, i); builder.Append("</span>"); builder.Append(" "); } } else { for (int i = pagedList.pageIndex - 5; i <= pagedList.pageIndex + 5; i++) { builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?{1}'>{2}</a>", url, paras + i, i); builder.Append("</span>"); builder.Append(" "); } builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?{1}'>{2}</a>", url, paras + (pagedList.pageIndex + 6), "..."); builder.Append("</span>"); builder.Append(" "); } } } if (pagedList.pageIndex >= 1 && pagedList.pageIndex < pagedList.totalPageCount) { builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?{1}'>{2}</a>", url, paras + (pagedList.pageIndex + 1), "下一页"); builder.Append("</span>"); builder.Append(" "); builder.Append("<span class='p'>"); builder.AppendFormat("<a href='{0}?{1}'>{2}</a>", url, paras + pagedList.totalPageCount, "尾页"); builder.Append("</span>"); builder.Append(" "); } builder.Append("</div>"); } return builder.ToString(); } } }
4. PagerLinqExtension（ 基于linq的扩展）
using System; using System.Collections.Generic; using System.Linq; using System.Linq.Expressions; using System.Web; namespace Infrastruction.Pager { public static class PagerLinqExtension { public static PagedList<T> ToPagedList<T>(this IQueryable<T> source, int pageIndex, int pageSize) { return new PagedList<T>(source, pageIndex, pageSize); } } }
调用方法
1.Webform调用: <%=PagerHelper.Pager("Products.aspx", pageList, new { cid=Cid})%> 或者用literal在后台绑定也行
2.Mvc调用:
需要扩展一下方法
namespace System.Web.Mvc.Html { public static class HtmlExtension { public static IHtmlString Pager(this HtmlHelper helper, string url, IPagedList pagedList) { return helper.Raw(PagerHelper.Pager(url, pagedList)); } public static IHtmlString Pager(this HtmlHelper helper, string url, IPagedList pagedList, dynamic objAttr) { return helper.Raw(PagerHelper.Pager(url, pagedList, objAttr)); } } }
然后页面调用@Html.Pager("Products.aspx", pageList, new { cid=Cid,......})
全部的代码都在上面，大家想看的可以看看，有不同想法的也可以和我交流下，左上角有qq。