含html标记的文本处理方法

    /// <summary>    /// 去除给定内容中的html标记，只保留图片标记    /// </summary>    /// <param name="strHtml">给定内容</param>    protected string getContent(string strHtml)    {        string str = string.Empty;        //str = Regex.Replace(strHtml, "<.+?>", "", RegexOptions.IgnoreCase);//一个去掉所有HTML标记        //str = Regex.Replace(strHtml, "/<(?!img).*?>/g", " ", RegexOptions.IgnoreCase);//这是保留Img和<br>        //str = Regex.Replace(strHtml, "<(?!/?br|/?img)[^<>]*>", "", RegexOptions.IgnoreCase);//保留Img和<Br>        str = Regex.Replace(strHtml, "<(?!/?img)[^<>]*>", "", RegexOptions.IgnoreCase);//保留Img        //改Img为[图片]        str = Regex.Replace(str, "<?img[^<>]*>", "[图片]", RegexOptions.IgnoreCase);        //空格符        string strEmpty = " ";        int intEmpy = strEmpty.Length;        str = str.Trim();        //去除所有空格符        while (str.IndexOf(strEmpty) != -1)        {            str = str.Remove(str.IndexOf(strEmpty), intEmpy);        }        return str;    }