///去除HTML标记

///</summary>

///<paramname="NoHTML">包括HTML的源码</param>

///<returns>已经去除后的文字</returns>

publicstaticstringNoHTML(stringHtmlstring)

{

//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();

returnHtmlstring;

}

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<br>，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。

代码如下:

///<summary>

///去除HTML标记(保留br跟\r\n)

///</summary>

///<paramname="NoHTML">包括HTML的源码</param>

///<returns>已经去除后的文字</returns>

publicstaticstringNewNoHTML(stringHtmlstring)

{

//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)","&nbsp;");

returnHtmlstring;

}

这个过滤可以用于让用户输入发布内容时的过滤。

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