在 C# 中将 HTML 实体转换为 Unicode 字符
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Converting HTML entities to Unicode Characters in C#
提问by Remy
I found similar questions and answers for Python and Javascript, but not for C# or any other WinRT compatible language.
我在 Python 和 Javascript 中找到了类似的问题和答案，但没有为 C# 或任何其他 WinRT 兼容语言找到类似的问题和答案。
The reason I think I need it, is because I'm displaying text I get from websites in a Windows 8 store app. E.g. éshould become é.
我认为我需要它的原因是因为我正在显示从 Windows 8 商店应用程序中的网站获得的文本。例如é应该成为é.
Or is there a better way? I'm not displaying websites or rss feeds, but just a list of websites and their titles.
或者，还有更好的方法？我不显示网站或 RSS 提要，而只是显示网站及其标题的列表。
采纳答案by Blachshma
I recommend using System.Net.WebUtility.HtmlDecodeand NOTHttpUtility.HtmlDecode.
我建议使用System.Net.WebUtility.HtmlDecode而不是HttpUtility.HtmlDecode。
This is due to the fact that the System.Webreference does not exist in Winforms/WPF/Console applications and you can get the exact same result using this class (which is already added as a reference in all those projects).
这是因为该System.Web引用在 Winforms/WPF/Console 应用程序中不存在，您可以使用此类获得完全相同的结果（已在所有这些项目中作为引用添加）。
Usage:
用法：
string s = System.Net.WebUtility.HtmlDecode("é"); // Returns é
回答by Mudassir Hasan
回答by user1954682
Different coding/encoding of HTML entities and HTML numbers in Metro App and WP8 App.
Metro App 和 WP8 App 中 HTML 实体和 HTML 编号的不同编码/编码。
With Windows Runtime Metro App
使用 Windows 运行时 Metro 应用程序
{
string inStr = "ó";
string auxStr = System.Net.WebUtility.HtmlEncode(inStr);
// auxStr == ó
string outStr = System.Net.WebUtility.HtmlDecode(auxStr);
// outStr == ó
string outStr2 = System.Net.WebUtility.HtmlDecode("ó");
// outStr2 == ó
}
With Windows Phone 8.0
使用 Windows Phone 8.0
{
string inStr = "ó";
string auxStr = System.Net.WebUtility.HtmlEncode(inStr);
// auxStr == ó
string outStr = System.Net.WebUtility.HtmlDecode(auxStr);
// outStr == ó
string outStr2 = System.Net.WebUtility.HtmlDecode("ó");
// outStr2 == ó
}
To solve this, in WP8, I have implemented the table in HTML ISO-8859-1 Referencebefore calling System.Net.WebUtility.HtmlDecode().
为了解决这个问题，在WP8，我已经实现了在表HTML ISO-8859-1参考之前调用System.Net.WebUtility.HtmlDecode()。
回答by zumey
This might be useful, replaces all (for as far as my requirements go) entities with their unicode equivalent.
这可能很有用，用它们的 unicode 等效替换所有（就我的要求而言）实体。
public string EntityToUnicode(string html) {
var replacements = new Dictionary<string, string>();
var regex = new Regex("(&[a-z]{2,5};)");
foreach (Match match in regex.Matches(html)) {
if (!replacements.ContainsKey(match.Value)) {
var unicode = HttpUtility.HtmlDecode(match.Value);
if (unicode.Length == 1) {
replacements.Add(match.Value, string.Concat("&#", Convert.ToInt32(unicode[0]), ";"));
}
}
}
foreach (var replacement in replacements) {
html = html.Replace(replacement.Key, replacement.Value);
}
return html;
}
回答by hcoverlambda
This worked for me, replaces both common and unicode entities.
这对我有用，替换了 common 和 unicode 实体。
private static readonly Regex HtmlEntityRegex = new Regex("&(#)?([a-zA-Z0-9]*);");
public static string HtmlDecode(this string html)
{
if (html.IsNullOrEmpty()) return html;
return HtmlEntityRegex.Replace(html, x => x.Groups[1].Value == "#"
? ((char)int.Parse(x.Groups[2].Value)).ToString()
: HttpUtility.HtmlDecode(x.Groups[0].Value));
}
[Test]
[TestCase(null, null)]
[TestCase("", "")]
[TestCase("'fark'", "'fark'")]
[TestCase(""fark"", "\"fark\"")]
public void should_remove_html_entities(string html, string expected)
{
html.HtmlDecode().ShouldEqual(expected);
}
回答by EminST
Improved Zumey method (I can`t comment there). Max char size is in the entity: &exclamation; (11). Upper case in the entities are also possible, ex. À (Source from wiki)
改进的 Zumey 方法（我无法在那里发表评论）。最大字符大小在实体中：&exclamation; (11)。实体中的大写也是可能的，例如。À（来自维基）
public string EntityToUnicode(string html) {
var replacements = new Dictionary<string, string>();
var regex = new Regex("(&[a-zA-Z]{2,11};)");
foreach (Match match in regex.Matches(html)) {
if (!replacements.ContainsKey(match.Value)) {
var unicode = HttpUtility.HtmlDecode(match.Value);
if (unicode.Length == 1) {
replacements.Add(match.Value, string.Concat("&#", Convert.ToInt32(unicode[0]), ";"));
}
}
}
foreach (var replacement in replacements) {
html = html.Replace(replacement.Key, replacement.Value);
}
return html;
}
