public string ToString(int total, int pageSize, int pageIndex, string query_string)
{
int allpage = 0;
int next = 0;
int pre = 0;
int startcount = 0;
int endcount = 0;
StringBuilder pagestr = new StringBuilder();
pageIndex = pageIndex == 0 ? 1 : pageIndex;
pagestr.AppendFormat("<div class=\"{0}\" >", SetClassName);
if (pageIndex < 1) { pageIndex = 1; }
//计算总页数
if (pageSize != 0)
{
allpage = (total / pageSize);
allpage = ((total % pageSize) != 0 ? allpage + 1 : allpage);
allpage = (allpage == 0 ? 1 : allpage);
}
next = pageIndex + 1;
pre = pageIndex - 1;
startcount = (pageIndex + 5) > allpage ? allpage - 9 : pageIndex - 4;//中间页起始序号
//中间页终止序号
endcount = pageIndex < 5 ? 10 : pageIndex + 5;
if (startcount < 1) { startcount = 1; } //为了避免输出的时候产生负数,设置如果小于1就从序号1开始
if (allpage < endcount) { endcount = allpage; }//页码+5的可能性就会产生最终输出序号大于总页码,那么就要将其控制在页码数之内
bool isFirst = pageIndex == 1;
bool isLast = pageIndex == allpage;
if (SetIsShowText)
pagestr.AppendFormat(SetTextFormat, total, pageIndex, allpage);
if (isFirst)
{
pagestr.Append("<span>首页</span> <span>上一页</span>");
}
else
{
pagestr.AppendFormat("<a href=\"{0}pageIndex=1\">首页</a> <a href=\"{0}pageIndex={1}\">上一页</a>", query_string, pre);
}
//中间页处理,这个增加时间复杂度,减小空间复杂度
for (int i = startcount; i <= endcount; i++)
{
bool isCurent = pageIndex == i;
if (isCurent)
{
pagestr.Append(" <a class=\"page_current\">" + i + "</a>");
}
else
{
pagestr.Append(" <a href=\"" + query_string + "pageIndex=" + i + "\">" + i + "</a>");
}
}
if (isLast)
{
pagestr.Append("<span>下一页</span> <span>末页</span>");
}
else
{
pagestr.Append(" <a href=\"" + query_string + "pageIndex=" + next + "\">下一页</a> <a href=\"" + query_string + "pageIndex=" + allpage + "\">末页</a>");
}
pagestr.AppendFormat("</div>");
return ConversionData(pagestr.ToString());
}