将字节写入文件末尾PNG格式

Question

我有一个包含PNG文件的资源文件我希望将字节数组写入End Of File PNG图像但是当从流中保存文件时删除字节数组，我想将隐藏的字节写入PNG文件，如何解决这个问题？ 谢谢你提前。

        public void Method()
        {
            using (var reader = new ResourceReader("My.resource"))
            {
                var iter = reader.GetEnumerator();
                var ms = new MemoryStream();
                var writer = new System.Resources.ResourceWriter(ms);
                while (iter.MoveNext())
                {
                    var key = iter.Key as string;
                    var value = iter.Value as Bitmap;
                    MemoryStream stream = new MemoryStream();
                    value.Save(stream, value.RawFormat);
                    byte[] b = new byte[] {0x11, 0x22, 0x33};
                    stream.Write(b, 0, b.Length);
                    Image bitmap = Image.FromStream(stream);
                    writer.AddResource(key, bitmap);
                }
                writer.Generate();
                File.WriteAllBytes("My1.resource", ms.ToArray());
            }
        }