addFontFile from Resources

by 
private static void AddFontFromResource(PrivateFontCollection privateFontCollection, string fontResourceName)
{
    var fontBytes = GetFontResourceBytes(typeof (App).Assembly, fontResourceName);
    var fontData = Marshal.AllocCoTaskMem(fontBytes.Length);
    Marshal.Copy(fontBytes, 0, fontData, fontBytes.Length);
    privateFontCollection.AddMemoryFont(fontData, fontBytes.Length);
    // Marshal.FreeCoTaskMem(fontData);  Nasty bug alert, read the comment
}

private static byte[] GetFontResourceBytes(Assembly assembly, string fontResourceName)
{
    var resourceStream = assembly.GetManifestResourceStream(fontResourceName);
    if (resourceStream == null)
        throw new Exception(string.Format("Unable to find font '{0}' in embedded resources.", fontResourceName));
    var fontBytes = new byte[resourceStream.Length];
    resourceStream.Read(fontBytes, 0, (int)resourceStream.Length);
    resourceStream.Close();
    return fontBytes;
}

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