asp.net c#过滤html代码,净化DIV SPAN等

        public static string GetSafeHtml(string val)
        {
            if (string.IsNullOrEmpty(val))
            {
                return string.Empty;
            }
            var v1 = Sanitizer.GetSafeHtmlFragment(val);//安全字符
            var v2 = SanitizerCompatibleWithChineseCharacters(v1);//中文乱码
            //Regex objRegEx=new Regex("<([^>]+)( [^>]+)>");<(?!img|a|\a)([^>]+)( [^>]+)>
            Regex objRegEx = new Regex("<(?!img|a|\a|font)([^>]+)( [^>]+)>");//过滤HTML标签属性
            Regex objRegEx2 = new Regex("<[^>^/]+></[^>]+>");//过滤空白HTML标签

            var v3 = objRegEx.Replace(v2, "<$1>");
            var v4 = objRegEx2.Replace(v3, "");
            return v4;
        }