/// <summary>         /// 内联         /// </summary>         /// <param name="content"></param>         /// <returns></returns>         public string ReplaceTextTag(string content)         {             A  a = new A();             string result = "";             if (!string.IsNullOrEmpty(content))             {                 //标签                 List<Tag> listAll = a .GetTag(); 获取标签也就是所谓的关键字                 string str1 = content;                 result = keyAddUrl(str1, listAll);             }             return result;         }         /// <summary>         /// 加title，加链接         /// </summary>         /// <param name="src"></param>         /// <param name="keys"></param>         /// <returns></returns>         private string keyAddUrl(string src, List<TopicTag> keys)         {             Regex reg = new Regex(@"(?i)(?:^|(?<!<a\b(?>[^<>]*))>)(?>[^<>]*)(?:<|$)");             int length = 0;             string temp = string.Empty;             return reg.Replace(src, delegate(Match m)             {                 temp = m.Value;                 length = temp.Length;                 for (int i = keys.Count - 1; i >= 0; i--)                 {                     temp = Regex.Replace(temp, @"(?is)^((?:(?:(?!" + Regex.Escape(keys[i].Label) + @"|</?a\b).)*<a\b(?:(?!</?a\b).)*</a>)*(?:(?!" + Regex.Escape(keys[i].Label) + @"|</?a\b).)*)(?<tag>" + Regex.Escape(keys[i].Label) + @")",                         @"$1<a href=""http://cn.greatexportimport.com/topic-" + keys[i].Id + @""" target=""_blank"" title=""${tag}"">${tag}</a>");                     if (length != temp.Length)                     {                         keys.Remove(keys[i]);                     }                     length = temp.Length;                 }                 return temp;             });         }