c# System.IO 关于write方法问题

Question

本人使用ZOutputStream 解压数据

public byte[] deCompression(byte[] bytes)
{
MemoryStream outStream = new MemoryStream();
ZOutputStream zOutputStream = new ZOutputStream(outStream);

zOutputStream.Write(bytes, 0, bytes.Length);
zOutputStream.Close();
outStream.Close();
return outStream.ToArray();
}
调用zOutputStream.Write(bytes, 0, bytes.Length);时出错，如果改为zOutputStream.Write(bytes, 0, bytes.Length-1);就变得正常，但是这样就少写入一个byte好奇怪啊，求高人指点。
write（byte[] bytes, int off, int len）