一个分页的HtmlHelper

namespace System.Web.Mvc
{
    public static class TianqyHtmlHelper
    {
        /// <summary>
        /// 分页HtmlHelper
        /// </summary>
        public static HtmlString ShowPageNavigate(this HtmlHelper htmlHelper, int currentPage, int pageSize, int totalCount)
        {
            pageSize = pageSize == 0 ? 3 : pageSize;
            var redirectTo = htmlHelper.ViewContext.RequestContext.HttpContext.Request.Url.AbsolutePath;
            var totalPages = Math.Max((totalCount + pageSize - 1) / pageSize, 1); //总页数
            var outPut = new StringBuilder();
            if (totalPages > 1)
            {
                //首页
                if (currentPage != 1)
                {
                    outPut.AppendFormat("<a class='pageLink' href='{0}?pageIndex=1&pageSize={1}'>首页</a>", redirectTo, pageSize);
                }
                outPut.Append(" ");
                //上一页
                if (currentPage > 1)
                {
                    outPut.AppendFormat("<a class='pageLink' href='{0}?pageIndex={1}&pageSize={2}'>上一页</a>", redirectTo, currentPage - 1, pageSize);
                }
                outPut.Append(" ");
                //一共最多显示10个页码，前5个，后5个
                int n = 5;
                for (int i = 0; i <= 10; i++)
                {
                    if ((currentPage + i - n) > 1 && (currentPage + i - n) <= totalPages)
                    {
                        if (i == n)
                        {
                            outPut.AppendFormat("<a class='pageCurrent' href='{0}?pageIndex={1}&pageSize={2}'>{3}</a>", redirectTo, currentPage, pageSize, currentPage);
                        }
                        else
                        {
                            outPut.AppendFormat("<a class='pageLink' href='{0}?pageIndex={1}&pageSize={2}'>{3}</a>", redirectTo, currentPage + i - n, pageSize, currentPage + i - n);
                        }
                    }
                    outPut.Append(" ");
                }
                //下一页
                if (currentPage < totalPages)
                {
                    outPut.AppendFormat("<a class='pageLink' href='{0}?pageIndex={1}&pageSize={2}'>下一页</a>", redirectTo, currentPage + 1, pageSize);
                }
                outPut.Append(" ");
                //末页
                if (currentPage != totalPages)
                {
                    outPut.AppendFormat("<a class='pageLink' href='{0}?pageIndex={1}&pageSize={2}'>末页</a>", redirectTo, totalPages, pageSize);
                }
                outPut.Append(" ");
            }
            outPut.AppendFormat("第{0}页/共{1}页", currentPage, totalPages);
            return new HtmlString(outPut.ToString());
        }
    }
}