ASP.NET MVC4 HtmlHelper擴展類，實現分頁功能

1、擴展HtmlHelper類方法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); //總頁數
  var output = new StringBuilder();
  if (totalPages > 1)
  {
    output.AppendFormat("<a class='pageLink' href='{0}?pageIndex=1&pageSize={1}'>首頁</a> ", redirectTo, pageSize);
    if (currentPage > 1)
    {//處理上一頁的連接
      output.AppendFormat("<a class='pageLink' href='{0}?pageIndex={1}&pageSize={2}'>上一頁</a> ", redirectTo, currentPage - 1, pageSize);
    }

    output.Append(" ");
    int currint = 5;
    for (int i = 0; i <= 10; i++)
    {//一共最多顯示10個頁碼，前面5個，後面5個
      if ((currentPage + i - currint) >= 1 && (currentPage + i - currint) <= totalPages)
      {
        if (currint == i)
        {//當前頁處理              
          output.AppendFormat("<a class='cpb' href='{0}?pageIndex={1}&pageSize={2}'>{3}</a> ", redirectTo, currentPage, pageSize, currentPage);
        }
        else
        {//一般頁處理
          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)
    {//處理下一頁的鏈接
      output.AppendFormat("<a class='pageLink' href='{0}?pageIndex={1}&pageSize={2}'>下一頁</a> ", redirectTo, currentPage + 1, pageSize);
    }

    output.Append(" ");
    if (currentPage != totalPages)
    {
      output.AppendFormat("<a class='pageLink' href='{0}?pageIndex={1}&pageSize={2}'>末頁</a> ", redirectTo, totalPages, pageSize);
    }
    output.Append(" ");
  }
  output.AppendFormat("<label>第{0}頁 / 共{1}頁</label>", currentPage, totalPages);//這個統計加不加都行

  return new HtmlString(output.ToString());
}

2、添加公共類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、然後在Controller裡面添加Action

public ActionResult Index(int? pageSize, int? pageIndex)
{
  int pageIndex1 = pageIndex ?? 1;
  int pageSize1 = pageSize ?? 5;
  int count = 0;
  //從數據庫在取得數據，並返回總記錄數
  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裡的部分代碼

<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("編輯", "Edit", new { id = item.id }) |
        @Html.ActionLink("刪除", "Delete", new { id = item.id })
      </td>
    </tr>
  }
  @*分頁*@
  <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、添加一些樣式

.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.總結

這個案例簡單實現了在MVC中快速分頁，其實很多開源的項目中都有相關的HtmlHepler的擴展函數，其中也不乏帶有分頁的擴展，例如著名的開源商城項目nopCommerce，其中有就一個HtmlExtensions.cs擴展類，裡面就有關於分頁的擴展，人家寫的可是相當專業哦，有興趣的可以研究一下。