C#如何删除UL及LI中指定标签里文字的方法详解

PromptHtml = GetData.GetHTTPInfo(Config.Prompt_Url, "utf-8");
PromptHtml = PromptHtml.Replace("<ul><li>", "");
PromptHtml=PromptHtml.Replace("</li></ul>", "");
string ss = @"<a[\s\S]*?href=""([^" rel="external nofollow" "]*?)""[^>]*?>([\s\S]*?)</a>"; //这里
MatchCollection mcTable = Regex.Matches(PromptHtml, ss);
foreach (Match mTable in mcTable)
{
  if (mTable.Success)
  {
    PromptHtml = mTable.Groups[2].Value;
  }
}
resultHtml = PromptHtml;

<ul><li><a href="http://localhost/tg.aspx?ID=4194" rel="external nofollow" >哪些主题基金有望爆发？</a></li></ul>

middlebannerHtml = GetData.GetHTTPInfo(Config.Middlebanner_Url, "utf-8");
middlebannerHtml = middlebannerHtml.Replace("<ul><li>", "");
middlebannerHtml = middlebannerHtml.Replace("</li></ul>", "");
string ss = @"<span>([^<]+)</span>"; //这里
MatchCollection mcTable = Regex.Matches(middlebannerHtml, ss);
foreach (Match mTable in mcTable)
{
  if (mTable.Success)
  {
    middlebannerHtml = mTable.Groups[1].Value;
  }
}
middleContent = middlebannerHtml;

<ul><li><span>3年5倍涨幅的 不只是股票哦~</span> <a href="http://localhost/tg.aspx?ID=4195" rel="external nofollow" >立即查看</a></li></ul>