Asp.Net 提取编辑器中图片制作缩略图

 

提取编辑器中的首张图片

public static string GetFirstImages(string htmlText)
{
const string pattern = "<img [^~]*?>";
const string pattern1 = "src\\s*=\\s*((\"|\')?)(?<url>\\S+)(\"|\')?[^>]*";
string s = null;
Match match = Regex.Match(htmlText, pattern, RegexOptions.IgnoreCase); //找到img标记
if (match.Success)
{
string img = match.Value;
string imgsrc = Regex.Match(img, pattern1, RegexOptions.IgnoreCase).Result("${url}");
imgsrc = Regex.Replace(imgsrc, "\"|\'|\\>", "", RegexOptions.IgnoreCase);
s = imgsrc;
}
return s;
}

升级版本，提取文章中的所有图片的路径，存入ArrayList中;

调用方法：

   ArrayList listImg = ImgHelper.getImgUrl(imgstring, @"<IMG[^>]+src=\s*(?:'(?<src>[^']+)'|""(?<src>[^""]+)""|(?<src>[^>\s]+))\s*[^>]*>", "src");

ImgHelper类

class ImgHelper
    {
        /// <summary>  
        /// 获取文章中图片地址的方法  
        /// </summary>  
        /// <param name="html">文章内容</param>  
        /// <param name="regstr">正则表达式</param>  
        /// <param name="keyname">关键属性名</param>  
        /// <returns></returns>  
        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;
            }
        }

    }