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ASP.NET C# GetFontFamilies on web

I want to get all supported characters of a font, that font is stored in localhost:53625/fonts/WINGDNG2.TTF. I has try this thread in Stackoverflow
Get supported characters of a font - in C#
but have no luck.
When
Fonts.GetFontFamilies(#"C:\WINDOWS\Fonts\Arial.TTF");
return a list contain 1 family,
Fonts.GetFontFamilies(new
Uri(http://localhost:53625/fonts/WINGDNG2.TTF));
return a list contain 0 family.
Thank you for reading my question.
p/s: My project is a website using ASP.NET MVC5, so the function can be in C# (server side) or in Javascript (client site). If there are any codes can give me a list of supported characters of a font (with specific path like above), which side is no problem.

Instead of enumerating the Font Families, you can instantiate GlyphTypeface directly, if you know the font file location:
GlyphTypeface glyphTypeface = new GlyphTypeface(new Uri("file:///C:\\WINDOWS\\Fonts\\Kooten.ttf"));
Then access the GlyphCharacterMap to get all the supported characters:
IDictionary<int, ushort> characterMap = glyph.CharacterToGlyphMap;
https://msdn.microsoft.com/en-us/library/system.windows.media.glyphtypeface(v=vs.110).aspx

Filter fonts based on script support [Western, arabic, Greek, ...] in native C# (not P/Invoke)

I am trying to fill drop down box with font family names and I have a lot of fonts almost 600 and I want to reduce this number based on the user interface for example when the interface is LTR (western) English or french for example I would need to load just the fonts that support those scripts nothing more
right now I am doing this:
InstalledFontCollection c = new InstalledFontCollection();
FontFamily[] fontF = c.Families;
return fontF.Select(i => i.GetName(0)).ToArray();
when trying to change the language identifier in GetName method with other value I end up with the same amount of result
I have the values from Winnt.h header file which can be found here
I am using asp.net C# 4.5
what I am looking for is native C# solution without using P/Invoke or at least that would be my last fallback solution

Why new FontFamily("Invalid font") doesn't throw an Exception?

Why the following code does not throw an exception?
FontFamily font = new FontFamily("bla bla bla");
I need to know if a specific font (as combination of FontFamily, FontStyle, FontWeight, ...) exists in my current OS. How have I to do?

This is by design. Programs frequently ask for fonts that are not present on the machine, especially in a country far flung from the programmer's domicile. The font mapper produces an alternative. Font substitution is in general very common. You are looking at Arial right now if you are on a Windows machine. But I can paste 你好世界 into this post and you'll see it render accurately, even though Arial doesn't have glyphs for Chinese characters.
So hint number one is to not actually worry about what fonts are available. The Windows api has EnumFontFamiliesEx() to enumerate available font families. But that's not exposed in WPF, some friction with OpenType there, a font standard that's rather poorly integrated with Windows. Another shadow cast when Adobe gets involved with anything Microsoft does, it seems.
Some confusion in the comments about Winforms' FontFamily class. Which is actually usable in this case, its GetFamilies() method returns an array of available families. But only TrueType, not OpenType fonts.

You can use the class System.Drawing.Text.InstalledFontCollection
http://msdn.microsoft.com/en-us/library/system.drawing.text.installedfontcollection.aspx
WPF have a framework specific method Fonts.SystemFontFamilies
http://msdn.microsoft.com/en-us/library/system.windows.media.fonts.systemfontfamilies.aspx

To answer the question of why it isn't throwing an exception, according to FontFamily Constructor on MSDN the exception wasn't added until framework version 3.5.
I suspect that you are targeting version 3.0 or below.
Cheers!

You can browse the available fonts on the System using the Fonts.SystemFontFamilies collection - use some Linq to match on whatever conditions you need;
// true
bool exists = (from f in Fonts.SystemFontFamilies where f.Source.Equals("Arial") select f).Any();
// false
exists = (from f in Fonts.SystemFontFamilies where f.Source.Equals("blahblah") select f).Any();

GdiCharSet & iTextSharp

Is there the way to create iTextSharp font using additional info (such as gdiCharSet etc) from System.Drawing.Font object?

Short answer: Yes.
Long answer: Each attribute is a bit different, but all that information can be expressed within PDF in general, and iText[Sharp] in specific.
You can specify a font's encoding when you create it, but you must do so in a way iText understands. Specifically, encoding values are strings within iText[Sharp]. BaseFont has a number of public static string members that list many of the available encodings, including several code pages that will map nicely to some of the GdiCharSet values. Others, not so much.
I generally suggest using "Identity-H" and subsetting your fonts (which happens automagically with Identity-H, you can't avoid it, which is a Good Thing) unless you need to keep the file size to a bare minimum. There are several single-byte encodings, the most common of which is "WinAnsiEncoding", BaseFont.WINANSI (the default IIRC). The string can also be the name of a "CMap" (such as Identity-H).
CMaps are generally language specific, and encoding specific. UTF & Japanese, or Big5 (a Chinese encoding as I recall), or what have you. Identity-H (and Identity-V) are font specific instead. They simply map values in the content stream to glyph indexes in the font (which can vary wildly from one font to the next, or between versions of a given font: that's why you're required to embed subsets of Identity-* fonts).
In PDF (and therefore iText[Sharp]), "bold" and "italic" are part of the font's identity, not a property. "Arial-Bold", "Arial-Italic", etc.
Strikeout and underline are decorations added after the fact (though I believe iText will let you set a flag at the font level for such things in com.itextpdf.text.Font's constructor).
iText won't give you direct access to the height, though a font's "descriptor" will let you define it.
The point size isn't a property either, you set it and the font (and color, default black) before you draw some text.

Get fontfile from a given font name

I'm trying to get the file corresponding to a given system font, e.g: In my system I have the font "Algerian" with the corresponding file "C:\Windows\Fonts\ALGER.TTF", and the font Batang, with the file "C:\Windows\Fonts\batang.ttc".
I've seen a couple of posts saying that I can do this by iterating the fonts folder and extracting the font name from the file header (as explained here: http://www.codeguru.com/cpp/g-m/gdi/fonthandlinganddetection/article.php/c3659/), but this seems inefficient and a bit complicated.
Is there a better way to do it? or do I have to iterate the whole directory?
Thanks

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts you got the list of font with their filename