/// <summary>         /// 取得HTML中所有图片的 URL。         /// </summary>         /// <param name="sHtmlText">HTML代码</param>         /// <returns>图片的URL列表</returns>         public static string[] GetHtmlImageUrlList(string sHtmlText)         {             // 定义正则表达式用来匹配 img 标签             Regex regImg = new Regex(@"<img\b[^<>]*?\bsrc[\s\t\r\n]*=[\s\t\r\n]*[""']?[\s\t\r\n]*(?<imgUrl>[^\s\t\r\n""'<>]*)[^<>]*?/?[\s\t\r\n]*>", RegexOptions.IgnoreCase);             // 搜索匹配的字符串             MatchCollection matches = regImg.Matches(sHtmlText);             int i = 0;             string[] sUrlList = new string[matches.Count];             // 取得匹配项列表             foreach (Match match in matches)                 sUrlList[i++] = match.Groups["imgUrl"].Value;             return sUrlList;         }