asp.net中获取全文图片地址的方法

            public static ArrayList getImgUrl(string html, string regstr, string keyname)
            {
                ArrayList resultStr = new ArrayList();
                Regex r = new Regex(regstr, RegexOptions.IgnoreCase);
                MatchCollection mc = r.Matches(html);

                foreach (Match m in mc)
                {
                    resultStr.Add(m.Groups[keyname].Value.ToLower());
                }
                if (resultStr.Count > 0)
                {
                    return resultStr;
                }
                else
                {
                    //没有地址的时候返回空字符
                    resultStr.Add("");
                    return resultStr;
                }
            }