namespace Common
{public class PageLinkHelp{/// <summary>/// 生成分页超链接标签/// 使用了Bootstrap3的分页样式：首页«第380页第381页第382页第383页第384页»尾页/// </summary>/// <param name="pageIndex">当前页码（当前页索引）</param>/// <param name="pageCount">总页码数/// 总页数计算公式：/// 第1种.Math.Max((数据总条数 + 每页显示的数量 - 1) / 每页显示的数量, 1)：/// var pageCount = Math.Max((count + pageSize - 1) / pageSize, 1);/// 第2种.(int)Math.Ceiling(数据总条数 * 1.00 / 每页显示的数量) ：/// var pageCount = (int)Math.Ceiling(count * 1.00 / pageSize);/// </param>/// <returns>页码超链接</returns>public static string GetPageBar(int pageIndex, int pageCount){if (pageCount <= 1){return string.Empty;}int start = (pageIndex - 2);if (start < 1){start = 1;}int end = (start + 4);if (end > pageCount){start += pageCount - end;end = pageCount;}var linkStr = new System.Text.StringBuilder();linkStr.Append("<ul class=\"pagination\">");if (pageIndex != 1){linkStr.Append($"<li class=\"page-item\"><a class=\"page-link\" href='?pageIndex={1}' >首页</a></li>");linkStr.Append($"<li class=\"page-item\"><a class=\"page-link\" href='?pageIndex={pageIndex - 1}' >&laquo;</a></li>");}for (int i = start; i <= end; i++){if (i == pageIndex){//active//当前页linkStr.Append($"<li class=\"page-item active\"><a class=\"page-link\" href='?pageIndex={i}' >第{i}页</a></li>");}else{linkStr.Append($"<li class=\"page-item\"><a class=\"page-link\" href='?pageIndex={i}' >第{i}页</a></li>");}}if (pageIndex < pageCount){linkStr.Append($"<li class=\"page-item\"><a class=\"page-link\" href='?pageIndex={pageIndex + 1}' >&raquo;</a></li>");linkStr.Append($"<li class=\"page-item\"><a class=\"page-link\" href='?pageIndex={pageCount}' >尾页</a></li>");}linkStr.Append("</ul>");return linkStr.ToString();}}
}