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Un caractère de substitution étendu valide est compris entre 0xd800 et 0xdbff, inclus.
Nom du paramètre : highSurrogate
Erreur source:

Ligne 263 : else
Ligne 264 : {
Ligne 265 : retval = char.ConvertToUtf32(s[0], s[1]);
Ligne 266 : }
Ligne 267 :

Fichier source : C:_Dev\GitHub\FrwTwemoji\Generator\Helpers.cs Ligne : 265

Trace de la pile:

[ArgumentOutOfRangeException: Un caractère de substitution étendu valide est compris entre 0xd800 et 0xdbff, inclus.
Nom du paramètre : highSurrogate]
System.Char.ConvertToUtf32(Char highSurrogate, Char lowSurrogate) +2716088
FrwTwemoji.Helpers.ConvertUtf16ToCodePoint(String utf16) in C:_Dev\GitHub\FrwTwemoji\Generator\Helpers.cs:265
FrwTwemoji.Parser.WebParseEmojiRegExMatchEvaluator(Match match) in C:_Dev\GitHub\FrwTwemoji\Generated\FrwTwemoji\Parser.cs:120
System.Text.RegularExpressions.RegexReplacement.Replace(MatchEvaluator evaluator, Regex regex, String input, Int32 count, Int32 startat) +234
System.Text.RegularExpressions.Regex.Replace(String input, MatchEvaluator evaluator, Int32 count, Int32 startat) +28
System.Text.RegularExpressions.Regex.Replace(String input, MatchEvaluator evaluator) +38
System.Text.RegularExpressions.Regex.Replace(String input, String pattern, MatchEvaluator evaluator) +46
FrwTwemoji.Parser.WebParseEmoji(String input) in C:_Dev\GitHub\FrwTwemoji\Generated\FrwTwemoji\Parser.cs:108
FrwTwemoji.Parser.ParseEmoji(String input, AssetSizes size, AssetTypes type, RessourcesProviders provider) in C:_Dev\GitHub\FrwTwemoji\Generated\FrwTwemoji\Parser.cs:60
TestWebApp.PageDefault.BtnRender_Click(Object sender, EventArgs e) in C:_Dev\GitHub\FrwTwemoji\Tests\TestWebApp\Default.aspx.cs:31
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +111
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +110
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565

Need to up compatibility to twemoji 2.2 at least : https://github.com/twitter/twemoji/releases/tag/v2.2.0

to get images be nicest as possible, add support, to 1em omg size

When comparing local asset with the Unicode one , it doesn't seem to work.

server them as script content or WebResources

This is a tweet with a special emoji. The text 2\ufe0f\u20e3 is properly caught by the regular expression copied from Twemoji, but because it starts with the regular character '2', the call to char.ConvertToUtf32(char, char) fails with an ArgumentOutOfRangeException with the message A valid high surrogate character is between 0xd800 and 0xdbff, inclusive.

'2' (or the value 0x32) is definitely outside 0xd800 and 0xdbff

This happens on line 267 in Generator/Helpers.cs

As you can see by the tweet on Twitter, they have correctly replaced 2\ufe0f\u20e3 with an emoji (with the codepoint 32-20e3), whereas FrwTwemoji will end up using an "SOS" emoji (because an exception occured)