本文实例讲述了ASP.NET过滤HTML标签只保留换行与空格的方法。分享给大家供大家参考。具体分析如下：
自己从网上找了一个过滤HTML标签的方法，我也不知道谁的才是原创的，反正很多都一样。我把那方法复制下来，代码如下：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | ///
<summary>///
去除HTML标记///
</summary>///
<param name="NoHTML">包括HTML的源码 </param>///
<returns>已经去除后的文字</returns>public static string NoHTML(string Htmlstring){ //删除脚本 Htmlstring
= Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase); //删除HTML Htmlstring
= Regex.Replace(Htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"([\r\n])[\s]+", "", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"-->", "",
RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"<!--.*", "",
RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(quot|#34);", "\"", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(amp|#38);", "&", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(lt|#60);", "<", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(gt|#62);", ">", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(nbsp|#160);", "
", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(iexcl|#161);", "\xa1", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(cent|#162);", "\xa2", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(pound|#163);", "\xa3", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(copy|#169);", "\xa9", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&#(\d+);", "", RegexOptions.IgnoreCase); Htmlstring.Replace("<", ""); Htmlstring.Replace(">", ""); Htmlstring.Replace("\r\n", ""); Htmlstring
= HttpContext.Current.Server.HtmlEncode(Htmlstring).Trim(); return Htmlstring;} |
以上代码是从网上直接复制过来的，这个确实能过滤掉所有的HTML标签，但是这个不是我想要的，这个过滤得太干净了，我如果用textarea输入框的话，我是要保留空格跟换行的。
然后我就自己改了一下这个方法，textarea的换行是\n，所以我得把这些标签重新匹配替换成
，这样的话从数据库中读取到页面时，就能正确的换行了，把空格替换成HTML的空格符，大功告成。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | ///
<summary>///
去除HTML标记(保留br跟\r\n)///
</summary>///
<param name="NoHTML">包括HTML的源码 </param>///
<returns>已经去除后的文字</returns>public static string NewNoHTML(string Htmlstring){ //Htmlstring.Replace("\\r\\n",
"%r%n").Replace("<br>","%br%").Replace("<br/>","%br&%").Replace("\\n","%n"); //删除脚本 Htmlstring
= Regex.Replace(Htmlstring, @"<script[^>]*?>.*?</script>", "", RegexOptions.IgnoreCase); //删除HTML Htmlstring
= Regex.Replace(Htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"-->", "",
RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"<!--.*", "",
RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(quot|#34);", "\"", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(amp|#38);", "&", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(lt|#60);", "<", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(gt|#62);", ">", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(nbsp|#160);", "
", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(iexcl|#161);", "\xa1", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(cent|#162);", "\xa2", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(pound|#163);", "\xa3", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&(copy|#169);", "\xa9", RegexOptions.IgnoreCase); Htmlstring
= Regex.Replace(Htmlstring, @"&#(\d+);", "", RegexOptions.IgnoreCase); Htmlstring.Replace("<", ""); Htmlstring.Replace(">", ""); //Htmlstring.Replace("\r\n",
""); Htmlstring
= HttpContext.Current.Server.HtmlEncode(Htmlstring); Htmlstring
= Regex.Replace(Htmlstring, @"((\r\n))", "<br>"); Htmlstring
= Regex.Replace(Htmlstring, @"(\r|\n)", "<br>"); Htmlstring
= Regex.Replace(Htmlstring, @"(\s)", "
"); return Htmlstring;} |
这个过滤可以用于让用户输入发布内容时的过滤。
