using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web.Mvc;

namespace PagerExtend
{
 public static class HtmlHelperExtensions
 {

  #region 分页扩展 PageExtend

  /// <summary>
  /// 分页option属性
  /// </summary>
  public class MoPagerOption
  {
   /// <summary>
   /// 当前页 必传
   /// </summary>
   public int CurrentPage { get; set; }
   /// <summary>
   /// 总条数 必传
   /// </summary>
   public int Total { get; set; }

   /// <summary>
   /// 分页记录数（每页条数 默认每页15条）
   /// </summary>
   public int PageSize { get; set; }

   /// <summary>
   /// 路由地址(格式如：/Controller/Action) 默认自动获取
   /// </summary>
   public string RouteUrl { get; set; }

   /// <summary>
   /// 样式 默认 bootstrap样式 1
   /// </summary>
   public int StyleNum { get; set; }
  }

  /// <summary>
  /// 分页扩展方法
  /// </summary>
  /// <param name="helper">html试图</param>
  /// <param name="option">分页属性</param>
  /// <returns>html样式</returns>
  public static MvcHtmlString PageExtend(this HtmlHelper helper, MoPagerOption option)
  {

   if (option.PageSize <= 0) { option.PageSize = 15; }
   if (option.CurrentPage <= 0) { option.CurrentPage = 1; }
   if (option.Total <= 0) { return MvcHtmlString.Empty; }

   //总页数
   var totalPage = option.Total / option.PageSize + (option.Total % option.PageSize > 0 ? 1 : 0);
   if (totalPage <= 0) { return MvcHtmlString.Create("分页异常"); }
   //当前路由地址
   if (string.IsNullOrEmpty(option.RouteUrl))
   {

    option.RouteUrl = helper.ViewContext.HttpContext.Request.RawUrl;
    if (!string.IsNullOrEmpty(option.RouteUrl))
    {

     var lastIndex = option.RouteUrl.LastIndexOf("/");
     option.RouteUrl = option.RouteUrl.Substring(0, lastIndex);
    }
   }
   option.RouteUrl = option.RouteUrl.TrimEnd('/');

   //构造分页样式
   var sbPage = new StringBuilder(string.Empty);
   switch (option.StyleNum)
   {
    case 2:
     {
      break;
     }
    default:
     {
      #region 默认样式

      sbPage.Append("<nav>");
      sbPage.Append(" <ul class=\"pagination\">");
      sbPage.AppendFormat("  <li><a href=\"{0}/{1}\" aria-label=\"Previous\"><span aria-hidden=\"true\">«</span></a></li>",
            option.RouteUrl,
            option.CurrentPage - 1 <= 0 ? 1 : option.CurrentPage - 1);

      for (int i = 1; i <= totalPage; i++)
      {

       sbPage.AppendFormat("  <li {1}><a href=\"{2}/{0}\">{0}</a></li>",
        i,
        i == option.CurrentPage ? "class=\"active\"" : "",
        option.RouteUrl);

      }

      sbPage.Append("  <li>");
      sbPage.AppendFormat("   <a href=\"{0}/{1}\" aria-label=\"Next\">",
           option.RouteUrl,
           option.CurrentPage + 1 > totalPage ? option.CurrentPage : option.CurrentPage + 1);
      sbPage.Append("    <span aria-hidden=\"true\">»</span>");
      sbPage.Append("   </a>");
      sbPage.Append("  </li>");
      sbPage.Append(" </ul>");
      sbPage.Append("</nav>");
      #endregion
     }
     break;
   }


   return MvcHtmlString.Create(sbPage.ToString());
  }
  #endregion
 }
}

@using PagerExtend
@model IEnumerable<XinSheng.Api.Controllers.MoAirticle>

<table>
 Url：@ViewBag.Url

 @foreach (var item in Model)
 {
  <tr>
   <td>@item.Title</td>
   <td>@item.Author</td>
   <td>@item.CreateTime</td>
  </tr>
 }
</table>

@Html.PageExtend(ViewBag.PagerOption as HtmlHelperExtensions.MoPagerOption)

using PagerExtend;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Security;

namespace XinSheng.Api.Controllers
{

 [Serializable]
 public class MoAirticle
 {

  public string Title { get; set; }
  public string Author { get; set; }
  public DateTime CreateTime { get; set; }
 }

 public class HomeController : Controller
 {

  public ActionResult Index(int id)
  {
   ViewBag.Title = "测试 分页";

   List<MoAirticle> moAirticles = new List<MoAirticle>();

   for (int i = 1; i < 50; i++)
   {

    moAirticles.Add(new MoAirticle
    {
     Author = "神牛步行" + i,
     CreateTime = DateTime.Now,
     Title = "博客园之" + i
    });
   }
   ViewBag.Url = Request.RawUrl;

   //初始化分页基础信息
   var option = new HtmlHelperExtensions.MoPagerOption
   {

    CurrentPage = id,
    PageSize = 15,
    Total = moAirticles.Count
   };
   //动态传递分页属性
   ViewBag.PagerOption = option;

   var articles = moAirticles.Skip((option.CurrentPage - 1) * option.PageSize).Take(option.PageSize).ToList();
   return View(articles);
  }
 }
}