ASP.NET過濾HTML標簽只保留換行與空格的方法

2020-03-24 15:50:33

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來源：轉載

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本文實例講述了ASP.NET過濾HTML標簽只保留換行與空格的方法。分享給大家供大家參考。具體分析如下：自己從網上找了一個過濾HTML標簽的方法，我也不知道誰的才是原創的，反正很多都一樣。我把那方法復制下來，代碼如下：
復制代碼代碼如下:/// summary
/// 去除HTML標記
/// /summary
/// param name="NoHTML" 包括HTML的源碼 /param
/// returns 已經去除后的文字 /returns
html' target='_blank'>public static string NoHTML(string Htmlstring)
{
//刪除腳本
Htmlstring = Regex.Replace(Htmlstring, @" script[^ ]* .* /script ", "",
RegexOptions.IgnoreCase);
//刪除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;
}以上代碼是從網上直接復制過來的，這個確實能過濾掉所有的HTML標簽，但是這個不是我想要的，這個過濾得太干凈了，我如果用textarea輸入框的話，我是要保留空格跟換行的。然后我就自己改了一下這個方法，textarea的換行是/n，所以我得把這些標簽重新匹配替換成 br ，這樣的話從數據庫中讀取到頁面時，就能正確的換行了，把空格替換成HTML的空格符，大功告成。
復制代碼代碼如下:/// summary
/// 去除HTML標記(保留br跟/r/n)
/// /summary
/// param name="NoHTML" 包括HTML的源碼 /param
/// returns 已經去除后的文字 /returns
public static string NewNoHTML(string Htmlstring)
{
//Htmlstring.Replace("http://r//n", "%r%n").Replace(" br ","%br%").Replace(" br/ ","%br&%").Replace("http://n","%n");
//刪除腳本
Htmlstring = Regex.Replace(Htmlstring, @" script[^ ]* .* /script ", "",
RegexOptions.IgnoreCase);
//刪除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;
}這個過濾可以用于讓用戶輸入發布內容時的過濾。希望本文所述對大家的asp.net程序設計有所幫助。更多編程語言

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