发布一个从webform改进而来的asp.net mvc分页工具类

我在前面的博客里曾经再次总结过一个webform下使用极广的分页辅助类。本文总结一下asp.net mvc下的简单分页工具类，对于需要从事mvc开发的朋友可以参考一下。这个分页辅助类本质上就是直接使用webform下的分页工具类，再配合HtmlHelper扩展方法稍加改进和包装。所有分页过程可以省却很多代码，而且在View（页面）里调用和webform的方式差不多，使用很方便。

1、webform下的一个分页辅助类

关于webform下的分页工具类的具体使用介绍，您可以参考这一篇。

使用的时候，需要初始化样式，在web.config下可以添加配置:

<appSettings>
  <!--分页样式-->
  <add key="PagerStyle" value="PagerCss"/>
</appSettings>

2、AspNetMvcPager静态类

这个静态类是对MVC下的HtmlHelper添加几个生成分页tag的扩展方法：

using System.Collections.Specialized;
using System.Text;
 
namespace System.Web.Mvc
{
    using DotNet.Common.WebForm;
 
    public static class AspNetMvcPager
    {
        public static string RenderPager(this HtmlHelper helper, int leftSize, int currentPage, int recordsPerPage, int totalCount, System.Web.HttpRequest request)
        {
            string url = GenerateURL(request);
            AspNetPagerControl ctrl = new AspNetPagerControl(currentPage, recordsPerPage, totalCount, leftSize, url);
            string pagerStr = AspNetPagerControl.RenderPager(ctrl);
            return GeneratePagerString(pagerStr);
        }
 
        public static string RenderPager(this HtmlHelper helper, int leftSize, int currentPage, int recordsPerPage, int totalCount, string baseString)
        {
            AspNetPagerControl ctrl = new AspNetPagerControl(currentPage, recordsPerPage, totalCount, leftSize, baseString);
            string pagerStr = AspNetPagerControl.RenderPager(ctrl);
            return GeneratePagerString(pagerStr);
 
        }
 
        public static string RenderStatisticPager(this HtmlHelper helper, int leftSize, int currentPage, int recordsPerPage, int totalCount, System.Web.HttpRequest request)
        {
            string url = GenerateURL(request);
            AspNetPagerControl ctrl = new AspNetPagerControl(currentPage, recordsPerPage, totalCount, leftSize, url);
            string pagerStr = AspNetPagerControl.RenderStatisticPager(ctrl);
            return GeneratePagerString(pagerStr);
        }
 
        public static string RenderStatisticPager(this HtmlHelper helper, int leftSize, int currentPage, int recordsPerPage, int totalCount, string baseString)
        {
            AspNetPagerControl ctrl = new AspNetPagerControl(currentPage, recordsPerPage, totalCount, leftSize, baseString);
            string pagerStr = AspNetPagerControl.RenderStatisticPager(ctrl);
            return GeneratePagerString(pagerStr);
        }
 
        private static string GenerateURL(System.Web.HttpRequest request)
        {
            StringBuilder url = new StringBuilder();
            url.Append(request.Url.AbsolutePath);
            NameValueCollection collection = request.QueryString;
            string[] keys = collection.AllKeys;
            int counter = 0;
            for (int i = 0; i < keys.Length; i++)
            {
                if (keys[i].ToLower() == "pageindex")
                {
                    continue;
                }
                url.AppendFormat("{0}{1}={2}", (counter == 0 ? "?" : "&"), keys[i], collection[keys[i]]);
                counter++;
            }
            return url.ToString();
        }
        private static string GeneratePagerString(string pagerStr)
        {
            TagBuilder builder = new TagBuilder("div");
            builder.IdAttributeDotReplacement = "_";
            builder.GenerateId(System.Guid.NewGuid().ToString());
            builder.InnerHtml = pagerStr;
            return builder.ToString();
        }
    }
}

3、控制器里查询和传参

在控制器里，view里有时候是通过点击查询按钮（POST方式）进行搜索的，有时候是点击分页链接通过url传参的（GET方式），所以控制查询条件和正确分页，都要在ctroller里做好。本文的示例代码给的代码相当简单，分页参数的获取也非常直接，您可以自己分析一下。

4、页面调用

和webform下类似，通过<%= %>直接绑定进行页面呈现：

<%=Html.RenderPager(pager.LeftSize, pager.CurrentPage, pager.RecordsPerPg, pager.TotalCount, HttpContext.Current.Request)%>
 
<%=Html.RenderStatisticPager(pager.LeftSize, pager.CurrentPage, pager.RecordsPerPg, pager.TotalCount, HttpContext.Current.Request)%>
 
<%=Html.RenderPager(pager.LeftSize, pager.CurrentPage, pager.RecordsPerPg, pager.TotalCount, string.Format("{0}?firstname={1}&lastname={2}", HttpContext.Current.Request.Url.AbsolutePath,pager.FirstName,pager.LastName))%>
 
<%=Html.RenderStatisticPager(pager.LeftSize, pager.CurrentPage, pager.RecordsPerPg, pager.TotalCount, string.Format("{0}?firstname={1}&lastname={2}", HttpContext.Current.Request.Url.AbsolutePath, pager.FirstName, pager.LastName))%>