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Filter HTML string summary in ASP. NET, asp.net string

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Author: User
Tags asp net
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Filter HTML string summary in ASP. NET, asp.net string

Write down for backup first!

 

C # code
  1. /// <Summary> remove HTML tags
  2. ///
  3. /// </Summary>
  4. /// <Param name = "Htmlstring"> including the source code of HTML </param>
  5. /// <Returns> removed text </returns>
  6. Public static string GetNoHTMLString (string Htmlstring)
  7. {
  8. // Delete the script
  9. Htmlstring = Regex. Replace (Htmlstring, @ "<script [^>] *?>. *? </Script> "," ", RegexOptions. IgnoreCase );
  10. // Delete HTML
  11. Htmlstring = Regex. Replace (Htmlstring, @ "<(. [^>] *)>", "", RegexOptions. IgnoreCase );
  12. Htmlstring = Regex. Replace (Htmlstring, @ "([\ r \ n]) [\ s] +", "", RegexOptions. IgnoreCase );
  13. Htmlstring = Regex. Replace (Htmlstring, @ "-->", "", RegexOptions. IgnoreCase );
  14. Htmlstring = Regex. Replace (Htmlstring, @ "<! --. * "," ", RegexOptions. IgnoreCase );
  17. Htmlstring = Regex. Replace (Htmlstring, @ "& (quot | #34);", "\" ", RegexOptions. IgnoreCase );
  18. Htmlstring = Regex. Replace (Htmlstring, @ "& (amp | #38);", "&", RegexOptions. IgnoreCase );
  19. Htmlstring = Regex. Replace (Htmlstring, @ "& (lt | #60);", "<", RegexOptions. IgnoreCase );
  20. Htmlstring = Regex. Replace (Htmlstring, @ "& (gt | #62);", ">", RegexOptions. IgnoreCase );
  21. Htmlstring = Regex. Replace (Htmlstring, @ "& (nbsp | #160);", "", RegexOptions. IgnoreCase );
  22. Htmlstring = Regex. Replace (Htmlstring, @ "& (iexcl | #161);", "\ xa1", RegexOptions. IgnoreCase );
  23. Htmlstring = Regex. Replace (Htmlstring, @ "& (cent | #162);", "\ xa2", RegexOptions. IgnoreCase );
  24. Htmlstring = Regex. Replace (Htmlstring, @ "& (pound | #163);", "\ xa3", RegexOptions. IgnoreCase );
  25. Htmlstring = Regex. Replace (Htmlstring, @ "& (copy | #169);", "\ xa9", RegexOptions. IgnoreCase );
  26. Htmlstring = Regex. Replace (Htmlstring, @ "& # (\ d +);", "", RegexOptions. IgnoreCase );
  29. Htmlstring. Replace ("<","");
  30. Htmlstring. Replace ("> ","");
  31. Htmlstring. Replace ("\ r \ n ","");
  32. Htmlstring = HttpContext. Current. Server. HtmlEncode (Htmlstring). Trim ();
  35. Return Htmlstring;
  36. }
  39. /// <Summary> obtain the displayed string to display HTML tags, but filter dangerous HTML tags, such as iframe and script.
  40. ///
  41. /// </Summary>
  42. /// <Param name = "str"> unprocessed string </param>
  43. /// <Returns> </returns>
  44. Public static string GetSafeHTMLString (string str)
  45. {
  46. Str = Regex. Replace (str, @ "<applet [^>] *?>. *? </Applet> "," ", RegexOptions. IgnoreCase );
  47. Str = Regex. Replace (str, @ "<body [^>] *?>. *? </Body> "," ", RegexOptions. IgnoreCase );
  48. Str = Regex. Replace (str, @ "<embed [^>] *?>. *? </Embed> "," ", RegexOptions. IgnoreCase );
  49. Str = Regex. Replace (str, @ "<frame [^>] *?>. *? </Frame> "," ", RegexOptions. IgnoreCase );
  50. Str = Regex. Replace (str, @ "<script [^>] *?>. *? </Script> "," ", RegexOptions. IgnoreCase );
  51. Str = Regex. Replace (str, @ "<frameset [^>] *?>. *? </Frameset> "," ", RegexOptions. IgnoreCase );
  52. Str = Regex. Replace (str, @ "
  53. Str = Regex. Replace (str, @ "<iframe [^>] *?>. *? </Iframe> "," ", RegexOptions. IgnoreCase );
  54. Str = Regex. Replace (str, @ "<style [^>] *?>. *? </Style> "," ", RegexOptions. IgnoreCase );
  55. Str = Regex. Replace (str, @ "<layer [^>] *?>. *? </Layer> "," ", RegexOptions. IgnoreCase );
  56. Str = Regex. Replace (str, @ "<link [^>] *?>. *? </Link> "," ", RegexOptions. IgnoreCase );
  57. Str = Regex. Replace (str, @ "<ilayer [^>] *?>. *? </Ilayer> "," ", RegexOptions. IgnoreCase );
  58. Str = Regex. Replace (str, @ "<meta [^>] *?>. *? </Meta> "," ", RegexOptions. IgnoreCase );
  59. Str = Regex. Replace (str, @ "<object [^>] *?>. *? </Object> "," ", RegexOptions. IgnoreCase );
  60. Return str;
  61. }

 


How does aspnet filter out html code?

Public static string NoHtml (string text)
{
// Delete the script
Text = Regex. Replace (text, @ "<script [^>] *?>. *? </Script> "," ", RegexOptions. IgnoreCase );
// Delete HTML
Text = Regex. Replace (text, @ "<(. [^>] *)>", "", RegexOptions. IgnoreCase );
Text = Regex. Replace (text, @ "([\ r \ n]) [\ s] +", "", RegexOptions. IgnoreCase );
Text = Regex. Replace (text, @ "-->", "", RegexOptions. IgnoreCase );
Text = Regex. Replace (text, @ "<! --. * "," ", RegexOptions. IgnoreCase );

Text = Regex. Replace (text, @ "& (quot | #34);", "\" ", RegexOptions. IgnoreCase );
Text = Regex. Replace (text, @ "& (amp | #38);", "&", RegexOptions. IgnoreCase );
Text = Regex. Replace (text, @ "& (lt | #60);", "<", RegexOptions. IgnoreCase );
Text = Regex. Replace (text, @ "& (gt | #62);", ">", RegexOptions. IgnoreCase );
Text = Regex. Replace (text, @ "& (nbsp | #160);", "", RegexOptions. IgnoreCase );
Text = Regex. Replace (text, @ "& (iexcl | #161);", "\ xa1", RegexOptions. IgnoreCase );
Text = Regex. Replace (text, @ "& (cent | #162);", "\ xa2", RegexOptions. IgnoreCase );
Text = Regex. Replace (text, @ "& (poun ...... the remaining full text>

Asp net filters html code

By default, POST requests containing HTML tags are prohibited. Set ValidateRequest = "false ".

For example:

<% @ Page Language = "C #" AutoEventWireup = "true" CodeBehind = "Default. aspx. cs" Inherits = YourNameSpace. YourClassName "ValidateRequest =" false "%>

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Related Keywords:
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