System.Drawing.Text.FontCollection.NativeFontFamilies C# (CSharp) Method

        List<string> NativeFontFamilies()
        {
            if (nativeFontCollection == null)
            {
                var collectionOptions = new CTFontCollectionOptions ();
                collectionOptions.RemoveDuplicates = true;
                nativeFontCollection = new CTFontCollection (collectionOptions);
                nativeFontDescriptors = new Dictionary<string, CTFontDescriptor> ();
            }

            var fontdescs = nativeFontCollection.GetMatchingFontDescriptors ();

            foreach (var fontdesc in fontdescs)
            {
                var font = new CTFont (fontdesc, 0);

                // Just in case RemoveDuplicates collection option is not working
                if (!nativeFontDescriptors.ContainsKey (font.FamilyName))
                {
                    nativeFontDescriptors.Add (font.FamilyName, fontdesc);
                }

            }
            var fontFamilies = new List<string> (nativeFontDescriptors.Keys);

            return fontFamilies;
        }