/// <summary>
/// 把对象序列化为字节数组
/// </summary>
public static byte[] SerializeObjectToBytes(object obj)
{
    if (obj == null)
        return null;
    MemoryStream ms = new MemoryStream();
    BinaryFormatter formatter = new BinaryFormatter();
    formatter.Serialize(ms, obj);
    byte[] bytes = ms.ToArray();
    return bytes;
}

/// <summary>
/// 把字节数组反序列化成对象
/// </summary>
public static object DeserializeObjectFromBytes(byte[] bytes)
{
    object obj = null;
    if (bytes == null)
        return obj;
    MemoryStream ms = new MemoryStream(bytes)
    {
        Position = 0
    };
    BinaryFormatter formatter = new BinaryFormatter();
    obj = formatter.Deserialize(ms);
    ms.Close();
    return obj;
}

public static void SerializeObjectToFile(string fileName, object obj) 
{
    using (FileStream fs = new FileStream(fileName, FileMode.Create))
    {
        BinaryFormatter formatter = new BinaryFormatter();
        formatter.Serialize(fs, obj);
    }
}

/// <summary>
/// 把文件反序列化成对象
/// </summary>
public static object DeserializeObjectFromFile(string fileName)
{
    using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
    {
        BinaryFormatter formatter = new BinaryFormatter();
        object obj = formatter.Deserialize(fs);
        return obj;
    }
}

/// <summary>
/// 把对象序列化到文件(AES加密)
/// </summary>
/// <param name="keyString">密钥(16位)</param>
public static void SerializeObjectToFile(string fileName, object obj, string keyString)
{
    using (AesCryptoServiceProvider crypt = new AesCryptoServiceProvider())
    {
        crypt.Key = Encoding.ASCII.GetBytes(keyString);
        crypt.IV = Encoding.ASCII.GetBytes(keyString);
        using (ICryptoTransform transform = crypt.CreateEncryptor())
        {
            FileStream fs = new FileStream(fileName, FileMode.Create);
            using (CryptoStream cs = new CryptoStream(fs, transform, CryptoStreamMode.Write))
            {
                BinaryFormatter formatter = new BinaryFormatter();
                formatter.Serialize(cs, obj);
            }
        }
    }
}

/// <summary>
/// 把文件反序列化成对象(AES加密)
/// </summary>
/// <param name="keyString">密钥(16位)</param>
public static object DeserializeObjectFromFile(string fileName, string keyString)
{
    using (AesCryptoServiceProvider crypt = new AesCryptoServiceProvider())
    {
        crypt.Key = Encoding.ASCII.GetBytes(keyString);
        crypt.IV = Encoding.ASCII.GetBytes(keyString);
        using (ICryptoTransform transform = crypt.CreateDecryptor())
        {
            FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
            using (CryptoStream cs = new CryptoStream(fs, transform, CryptoStreamMode.Read))
            {
                BinaryFormatter formatter = new BinaryFormatter();
                object obj = formatter.Deserialize(cs);
                return obj;
            }
        }
    }
}