Html辅助方法（分页、下拉框）

引用命名空间：

using System.Text;
using System.Web.Mvc;

Html分页方法

#region 分页Html辅助方法
        /// <summary>
        /// 分页Html辅助方法
        /// </summary>
        /// <param name="htmlHelper"></param>
        /// <param name="currentPage"></param>
        /// <param name="pageSize"></param>
        /// <param name="totalCount"></param>
        /// <param name="parameterString"></param>
        /// <returns></returns>
        public static HtmlString PageNavigate(this HtmlHelper htmlHelper, int currentPage, int pageSize, int totalCount, string parameterString)
        {
            var redirectTo = htmlHelper.ViewContext.RequestContext.HttpContext.Request.Url.AbsolutePath;
            pageSize = pageSize == 0 ? 3 : pageSize;
            var totalPages = Math.Max((totalCount + pageSize - 1) / pageSize, 1);//总页数
            var output = new StringBuilder();
            output.Append("<nav>");
            output.Append("<ul class='pagination'>");
            string pageSizrWithParameter = string.Empty;
            if (!string.IsNullOrEmpty(parameterString))
                pageSizrWithParameter = pageSize + "&" + parameterString;
            if (totalPages>1)
            {
                output.AppendFormat("<li><a href='{0}?pageIndex=1&pageSize={1}' aria-label='Previous'><span aria-hidden='true'>&laquo;</span></a></li>",redirectTo,pageSizrWithParameter);
                if (currentPage > 1)//处理上一页连接
                    output.AppendFormat("<li><a href='{0}?pageIndex={1}&pageSize={2}'>上一页</a></li>",redirectTo,currentPage-1,pageSizrWithParameter);

                output.Append("");
                int currint = 5;
                for (int i = 0; i < 10; i++)
                {//一共最多显示10个页码，前面五个后面五个
                    if ((currentPage+i-currint)>=1 && (currentPage+1-currint)<=totalPages)
                    {
                        if (currint == i)//当前页处理
                            output.AppendFormat("<li class='active'><a href='{0}?pageIndex={1}&pageSize={2}'>{3}</a></li>", redirectTo, currentPage, pageSizrWithParameter, currentPage);
                        else//一般页处理
                            output.AppendFormat("<li><a href='{0}?pageIndex={1}&pageSize={2}'>{3}</a></li>",redirectTo,currentPage+i-currint,pageSizrWithParameter,currentPage+i-currint);
                    }
                    output.Append("");
                }
                if (currentPage < totalPages)//处理下一页连接
                    output.AppendFormat("<li><a href='{0}?pageIndex={1}&pageSize={2}'>下一页</a></li>", redirectTo, currentPage + 1, pageSizrWithParameter);
                output.Append("");

                if (currentPage != totalPages)
                    output.AppendFormat("<li><a href='{0}?pageIndex={1}&pageSize={2}'><span aria-hidden='true'>&raquo;</span></a></li>", redirectTo, totalPages, pageSizrWithParameter);
                output.Append("");
            }
            output.Append("</ul>");
            output.Append("</nav>");

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

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