之前做了一个通用的分页组件，但是有些不足，从翻页事件和分页样式都融合在后台代码中，到翻页事件可以自定义，再到翻页和样式都和代码分离， 自定义分页 pager 越来越容易扩展了。

HtmlHelper Pager扩展

Pager V1.0 :

/// <summary>
  /// Pager V1.0
  /// </summary>
  /// <param name="helper">HtmlHelper</param>
  /// <param name="pager">分页信息</param>
  /// <returns></returns>
  public static MvcHtmlString Pager(this HtmlHelper helper, PagerModel pager)
  {
    StringBuilder sbHtmlText = new StringBuilder();
    sbHtmlText.Append("<div style=\"text-align:center\"><nav><ul class=\"pagination\">");
    if (pager.PageIndex <= 1)
    {
      sbHtmlText.Append("<li class=\"disabled\"><a href=\"javascript:void(0)\" aria-label=\"Previous\"><span aria-hidden=\"true\">«</span></a></li>");
    }
    else
    {
      sbHtmlText.AppendFormat("<li><a href=\"javascript:loadData(1)\" aria-label=\"1\"><span aria-hidden=\"true\">«</span></a></li>", pager.PageIndex - 1);
      sbHtmlText.AppendFormat("<li><a href=\"javascript:loadData({0})\">{0}</a></li>", pager.PageIndex - 1);
    }
    sbHtmlText.AppendFormat("<li class=\"active\"><a href=\"javascript:void(0)\">{0}<span class=\"sr-only\">(current)</span></a></li>", pager.PageIndex);
    if (pager.PageIndex >= pager.PageCount)
    {
      sbHtmlText.Append("<li class=\"disabled\"><a href=\"javascript:void(0)\" aria-label=\"Next\"><span aria-hidden=\"true\">»</span></a></li>");
    }
    else
    {
      sbHtmlText.AppendFormat("<li><a href=\"javascript:loadData({0})\">{0}</a></li>", pager.PageIndex + 1);
      sbHtmlText.AppendFormat("<li><a href=\"javascript:loadData({0})\" aria-label=\"Next\"><span aria-hidden=\"true\">»</span></a></li>", pager.PageIndex + 1);
    }
    sbHtmlText.Append("</ul></nav>");
    sbHtmlText.AppendFormat("<div><span>每页有<strong>{0}</strong>条数据，一共有<strong>{1}</strong>页，总计<strong>{2}</strong>条数据</span></div></div>", pager.PageSize, pager.PageCount, pager.TotalCount);
    return MvcHtmlString.Create(sbHtmlText.ToString());
  } 

Pager V2.0

/// <summary>
  /// Pager V2.0
  /// </summary>
  /// <param name="helper">HtmlHelper</param>
  /// <param name="pager">分页信息</param>
  /// <param name="onPageChange">翻页事件</param>
  /// <returns></returns>
  public static MvcHtmlString Pager(this HtmlHelper helper, PagerModel pager, Func<int, string> onPageChange)
  {
    StringBuilder sbHtmlText = new StringBuilder();
    sbHtmlText.Append("<div style=\"text-align:center\"><nav><ul class=\"pagination\">");
    if (pager.PageIndex <= 1)
    {
      sbHtmlText.Append("<li class=\"disabled\"><a href=\"javascript:void(0)\" aria-label=\"Previous\"><span aria-hidden=\"true\">«</span></a></li>");
    }
    else
    {
      sbHtmlText.AppendFormat("<li><a href=\"{0}\" aria-label=\"Previous\"><span aria-hidden=\"true\">«</span></a></li>", onPageChange(pager.PageIndex - 1));
      sbHtmlText.AppendFormat("<li><a href=\"{0}\">{1}</a></li>", onPageChange(pager.PageIndex - 1), pager.PageIndex - 1);
    }
    sbHtmlText.AppendFormat("<li class=\"active\"><a href=\"javascript:void(0)\">{0}<span class=\"sr-only\">(current)</span></a></li>", pager.PageIndex);
    if (pager.PageIndex >= pager.PageCount)
    {
      sbHtmlText.Append("<li class=\"disabled\"><a href=\"javascript:void(0)\" aria-label=\"Next\"><span aria-hidden=\"true\">»</span></a></li>");
    }
    else
    {
      sbHtmlText.AppendFormat("<li><a href=\"{0}\">{1}</a></li>", onPageChange(pager.PageIndex + 1), pager.PageIndex + 1);
      sbHtmlText.AppendFormat("<li><a href=\"{0}\" aria-label=\"Next\"><span aria-hidden=\"true\">»</span></a></li>", onPageChange(pager.PageIndex + 1));
    }
    sbHtmlText.Append("</ul></nav>");
    sbHtmlText.AppendFormat("<div><span>每页有<strong>{0}</strong>条数据，一共有<strong>{1}</strong>页，总计<strong>{2}</strong>条数据</span></div></div>", pager.PageSize, pager.PageCount, pager.TotalCount);
    return MvcHtmlString.Create(sbHtmlText.ToString());
  }