C#のWPFで外字を表示する　その２

    public partial class App : Application
    {
        public App()
        {
            var ffDef  = Window.FontFamilyProperty.DefaultMetadata.DefaultValue as System.Windows.Media.FontFamily;
            var ffName = ffDef.Source;

            string eudc    = "C:\\Windows\\Fonts\\EUDC.tte";
            string eudcDef = null;
            string eudcCur = null;
            using (RegistryKey key = Registry.CurrentUser.OpenSubKey("EUDC\\932"))
            {
                foreach (var nm in key.GetValueNames())
                {
                    if (0 == nm.CompareTo("SystemDefaultEUDCFont"))
                        eudcDef = key.GetValue(nm) as string;

                    if (0 == nm.CompareTo(ffName))
                        eudcCur = key.GetValue(nm) as string;
                }
                if (null != eudcDef) eudc = eudcDef;
                if (null != eudcCur) eudc = eudcCur;
            }

            ffName = ffName + ", file:///" + eudc.Replace('\\', '/') + "#EUDC";
            var font = new System.Windows.Media.FontFamily(ffName);

            var style = new Style(typeof(Window));
            style.Setters.Add(new Setter(Window.FontFamilyProperty, font));

            FrameworkElement.StyleProperty.OverrideMetadata(typeof(Window), new FrameworkPropertyMetadata(style));
        }
    }