UWP XmlSerializer - 对象从派生到基的反序列化 class

Question

所以我有 2 个 classes。第一个 class 是 Message，第二个是从 Message class.

派生的 MessageText class

这是消息class:

public class Message
{
    public Message(Guid from, Guid to, MessageType type, DateTime sentAt)
    {
        From = from;
        To = to;
        Type = type;
        SentAt = sentAt;
    }

    public Message()
    {
    }

    public Guid From { get; set; }
    public Guid To { get; set; }
    public MessageType Type { get; set; }
    public DateTime SentAt { get; set; }
}

这是 MessageText class:

public class MessageText : Message
{
    public MessageText(Guid from, Guid to, MessageType type, DateTime sentAt, string text)
        : base(from, to, type, sentAt)
    {
        this.Text = text;
    }

    public MessageText()
    {
    }

    public string Text { get; set; }
}

这是我进行序列化和反序列化的方式：

    public static byte[] ConvertToStream(object obj)
    {
        try
        {
            XmlSerializer bf = new XmlSerializer(obj.GetType());

            using (MemoryStream ms = new MemoryStream())
            {
                bf.Serialize(ms, obj);
                return ms.ToArray();
            }
        }
        catch { return new byte[0]; }
    }

    public static object ConvertFromStream<T>(byte[] data)
    {
        try
        {
            XmlSerializer bf = new XmlSerializer(typeof(T));
            using (MemoryStream ms = new MemoryStream(data))
            {
                return bf.Deserialize(ms);
            }
        }
        catch { return null; }
    }

我如何使用这些方法：

Byte[] buffer = XMLHelper.ConvertToStream(message);
// Now send the message
// ...
/// When I receive the message
Message msg = (Message)XMLHelper.ConvertFromStream<Message>(data);
switch (msg.Type)
        {
            case EMessageType.Text:
                if (OnMessageTextReceivedEvent != null)
                {
                    MessageText msgT = (MessageText)XMLHelper.ConvertFromStream(data);
                    OnMessageTextReceivedEvent(msgT, EventArgs.Empty);
                }
                break;
        //...
        }

所以当我收到消息时，我首先想将其反序列化为基础class，以便我可以看到它是什么类型的消息，然后将其反序列化为正确的类型。

注意：如果我想反序列化为正确的类型，我可以毫无问题地使用这种方法，例如，如果我将 MessageText 对象反序列化为 MessageText 对象，但是如果我尝试将 MessageText 对象反序列化到其基数 class 我收到以下错误："There is an error in XML document (2, 2)."

Answer 1

由于 XmlSerializer 期望根元素是 MessageText 的根元素 class 我只是使用以下代码更改 MessageText 的根元素 class 现在我可以将对象反序列化为 Message and/or MessageText class.

[XmlRoot("Message")]
public class MessageText : Message
{
    public MessageText(Guid from, Guid to, MessageType type, DateTime sentAt, string text)
        : base(from, to, type, sentAt)
    {
        this.Text = text;
    }

    public MessageText()
    {
    }

    public string Text { get; set; }
}

UWP XmlSerializer - 对象从派生到基的反序列化 class

UWP XmlSerializer - Deserialization of an object from a derived to base class

c#

serialization

xml-serialization