ASP.NET过滤HTML标签只保存换行与空格的要领【C#.Net教程】,ASP.NET 过滤 HTML

本文实例报告了ASP.NET过滤HTML标签只保存换行与空格的要领。分享给人人供人人参考。具体分析以下：

本身从网上找了一个过滤HTML标签的要领，我也不知道谁的才是原创的，横竖许多都一样。我把那要领复制下来，代码以下：

///   <summary>
///   去除HTML标记
///   </summary>
///   <param name="NoHTML">包含HTML的源码   </param>
///   <returns>已去除后的笔墨</returns>
public static string NoHTML(string Htmlstring)
{
  //删除剧本
  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，这个确切能过滤掉一切的HTML标签，然则这个不是我想要的，这个过滤得太清洁了，我假如用textarea输入框的话，我是要保存空格跟换行的。

然后我就本身改了一下这个要领，textarea的换行是\n，所以我得把这些标签从新婚配替换成<br>，如许的话从数据库中读取到页面时，就能够准确的换行了，把空格替换成HTML的空格符，功德圆满。

///   <summary>
///   去除HTML标记(保存br跟\r\n)
///   </summary>
///   <param   name="NoHTML">包含HTML的源码   </param>
///   <returns>已去除后的笔墨</returns>
public static string NewNoHTML(string Htmlstring)
{
    //Htmlstring.Replace("\\r\\n", "%r%n").Replace("<br>","%br%").Replace("<br/>","%br&%").Replace("\\n","%n");
    //删除剧本
    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;
}

这个过滤能够用于让用户输入宣布内容时的过滤。

愿望本文所述对人人的asp.net程序设计有所协助。

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