NET Core TagHelper实现分页标签

/// <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; }
 }

// GET: Articles
  public async Task<IActionResult> Index(int id = 1)
  {

   var artiles = _context.Article;
   var pageOption = new MoPagerOption
   {
    CurrentPage = id,
    PageSize = 2,
    Total = await artiles.CountAsync(),
    RouteUrl = "/Articles/Index"
   };

   //分页参数
   ViewBag.PagerOption = pageOption;

   //数据
   return View(await artiles.OrderByDescending(b => b.CreateTime).Skip((pageOption.CurrentPage - 1)  pageOption.PageSize).Take(pageOption.PageSize).ToListAsync());
  }

using Microsoft.AspNetCore.Razor.TagHelpers;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Text.Core.Extend
{

 #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>
 /// 分页标签
 /// </summary>
 public class PagerTagHelper : TagHelper
 {

  public MoPagerOption PagerOption { get; set; }

  
  public override void Process(TagHelperContext context, TagHelperOutput output)
  {

   output.TagName = "div";

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

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

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

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

   //构造分页样式
   var sbPage = new StringBuilder(string.Empty);
   switch (PagerOption.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\">&laquo;</span></a></li>",
            PagerOption.RouteUrl,
            PagerOption.CurrentPage - 1 <= 0 ? 1 : PagerOption.CurrentPage - 1);

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

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

      }

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

   output.Content.SetHtmlContent(sbPage.ToString());
   //output.TagMode = TagMode.SelfClosing;
   //return base.ProcessAsync(context, output);
  }

 }
 #endregion
}