ASP.NET过滤HTML标签只保留换行与空格的方法

2020-03-24 15:50:33

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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：
复制代码代码如下:/// 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
html' target='_blank'>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, @" ", "",
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 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。
复制代码代码如下:/// 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, @" ", "",
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。希望本文所述对大家的asp.net程序设计有所帮助。更多编程语言

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