ASP.NET MVC4 HtmlHelper扩展类，实现分页功能

1、扩展htmlhelper类方法showpagenavigate

public static htmlstring showpagenavigate(this htmlhelper htmlhelper, int currentpage, int pagesize, int totalcount)
{
  var redirectto = htmlhelper.viewcontext.requestcontext.httpcontext.request.url.absolutepath;
  pagesize = pagesize == 0 ? 3 : pagesize;
  var totalpages = math.max((totalcount + pagesize - 1) / pagesize, 1); //总页数
  var output = new stringbuilder();
  if (totalpages > 1)
  {
    output.appendformat("<a class='pagelink' href='{0}?pageindex=1&pagesize={1}'>首页</a> ", redirectto, pagesize);
    if (currentpage > 1)
    {//处理上一页的连接
      output.appendformat("<a class='pagelink' href='{0}?pageindex={1}&pagesize={2}'>上一页</a> ", redirectto, currentpage - 1, pagesize);
    }

    output.append(" ");
    int currint = 5;
    for (int i = 0; i <= 10; i++)
    {//一共最多显示10个页码，前面5个，后面5个
      if ((currentpage + i - currint) >= 1 && (currentpage + i - currint) <= totalpages)
      {
        if (currint == i)
        {//当前页处理              
          output.appendformat("<a class='cpb' href='{0}?pageindex={1}&pagesize={2}'>{3}</a> ", redirectto, currentpage, pagesize, currentpage);
        }
        else
        {//一般页处理
          output.appendformat("<a class='pagelink' href='{0}?pageindex={1}&pagesize={2}'>{3}</a> ", redirectto, currentpage + i - currint, pagesize, currentpage + i - currint);
        }
      }
      output.append(" ");
    }
    if (currentpage < totalpages)
    {//处理下一页的链接
      output.appendformat("<a class='pagelink' href='{0}?pageindex={1}&pagesize={2}'>下一页</a> ", redirectto, currentpage + 1, pagesize);
    }

    output.append(" ");
    if (currentpage != totalpages)
    {
      output.appendformat("<a class='pagelink' href='{0}?pageindex={1}&pagesize={2}'>末页</a> ", redirectto, totalpages, pagesize);
    }
    output.append(" ");
  }
  output.appendformat("<label>第{0}页 / 共{1}页</label>", currentpage, totalpages);//这个统计加不加都行

  return new htmlstring(output.tostring());
}

2、添加公共类pagerinfo,pagequery

public class pagerinfo
{
  public int recordcount { get; set; }

  public int currentpageindex { get; set; }

  public int pagesize { get; set; }
}


public class pagerquery<tpager, tentitylist>
{
  public pagerquery(tpager pager, tentitylist entitylist)
  {
    this.pager = pager;
    this.entitylist = entitylist;
  }
  public tpager pager { get; set; }
  public tentitylist entitylist { get; set; }
}

3、然后在controller里面添加action

public actionresult index(int? pagesize, int? pageindex)
{
  int pageindex1 = pageindex ?? 1;
  int pagesize1 = pagesize ?? 5;
  int count = 0;
  //从数据库在取得数据，并返回总记录数
  var temp = newsser.loadpageentities(c => true, c => c.id, false, pagesize1, pageindex1, out count);
  pagerinfo pager = new pagerinfo();
  pager.currentpageindex = pageindex1;
  pager.pagesize = pagesize1;
  pager.recordcount = count;
  pagerquery<pagerinfo, iqueryable<news>> query = new pagerquery<pagerinfo, iqueryable<news>>(pager, temp);
  return view(query);
}

4、view里的部分代码

<tbody>
  @foreach (var item in model.entitylist)
  {
    <tr>
      <td class="checkbox">
        <input name="ids[]" type="checkbox" value="" />
      </td>
      <td>
        @item.author
      </td>
      <td>
        @item.title
      </td>
      <td>
        @item.ctime
      </td>
      <td>
        @html.actionlink("编辑", "edit", new { id = item.id }) |
        @html.actionlink("删除", "delete", new { id = item.id })
      </td>
    </tr>
  }
  @*分页*@
  <tr class="">
    <td colspan="5" align="center" class="paginator">
      <span>
        @html.showpagenavigate(model.pager.currentpageindex, model.pager.pagesize, model.pager.recordcount)
      </span>
    </td>
  </tr>
</tbody>

5、添加一些样式

.paginator
{
  font: 12px arial, helvetica, sans-serif;
  padding: 10px 20px 10px 0;
  margin: 0px auto;
}
 
.paginator a
{
  border: solid 1px #ccc;
  color: #0063dc;
  cursor: pointer;
  text-decoration: none;
}
 
.paginator a:visited
{
  padding: 1px 6px;
  border: solid 1px #ddd;
  background: #fff;
  text-decoration: none;
}
 
.paginator .cpb
{
  border: 1px solid #f50;
  font-weight: 700;
  color: #f50;
  background-color: #ffeee5;
}
 
.paginator a:hover
{
  border: solid 1px #f50;
  color: #f60;
  text-decoration: none;
}
 
.paginator a, .paginator a:visited, .paginator .cpb, .paginator a:hover
{
  float: left;
  height: 16px;
  line-height: 16px;
  min-width: 10px;
  _width: 10px;
  margin-right: 5px;
  text-align: center;
  white-space: nowrap;
  font-size: 12px;
  font-family: arial,simsun;
  padding: 0 3px;
}
 
.paginator label
{
  display:block;  
  float:left;  
}

6.总结

这个案例简单实现了在mvc中快速分页，其实很多开源的项目中都有相关的htmlhepler的扩展函数，其中也不乏带有分页的扩展，例如著名的开源商城项目nopcommerce，其中有就一个htmlextensions.cs扩展类，里面就有关于分页的扩展，人家写的可是相当专业哦，有兴趣的可以研究一下。