C#:将CookieContainer写入磁盘并重新加载以供使用

public static void SaveCookieContainer(string filename, CookieContainer cookieJar)
{
    using (Stream stream = File.Open(filename, FileMode.Create))
    {
        BinaryFormatter formatter = new BinaryFormatter();
        formatter.Serialize(stream, cookieJar);
    }
}

public static CookieContainer LoadCookieContainer(string filename)
{
    CookieContainer cookieJar = null;
    using (Stream stream = File.Open(filename, FileMode.Open))
    {
        BinaryFormatter formatter = new BinaryFormatter();
        cookieJar = (CookieContainer)formatter.Deserialize(stream);
    }
    return cookieJar;
}