未知类型的自定义Xml序列化 [英] Custom Xml Serialization of Unknown Type

问题描述

我正在尝试通过XmlSerializer反序列化自定义类，并遇到一些问题，因为我不知道要反序列化的类型(可插入)，并且遇到了困难确定它.

I'm attempting to deserialize a custom class via the XmlSerializer and having a few problems, in the fact that I don't know the type that I'm going to be deserializing (it's pluggable) and I'm having difficulty determining it.

我发现了这篇文章，它看起来很相似，但是不能非常适合我的方法，因为我需要反序列化XmlSerializable接口.

I found this post which looks similar but can't quite get it to work with my approach because I need to deserialize an interface which is XmlSerializable.

我现在得到的是表格.请注意，我期望并且需要能够处理通过插件实现的A类和B类.因此，如果我可以避免使用IXmlSerializable(我认为我不能这样做)，那就太好了.

What I've currently got is of the form. Note that I expect and need to be able to handle both class A and class B to be implemented via a plugin. So if I can avoid using the IXmlSerializable (which I don't think I can) then that would be great.

A的ReadXml是我所坚持的.但是，如果我还有其他可以改进系统的更改，那么我很乐意这样做.

The ReadXml for A is what I'm stuck on. However if there are other changes that I can make to improve the system then I'm happy to do so.

public class A : IXmlSerializable
{
   public IB MyB { get; set;}

   public void ReadXml(System.Xml.XmlReader reader)
   {
      // deserialize other member attributes

      SeekElement(reader, "MyB");
      string typeName = reader.GetAttribute("Type");

      // Somehow need to the type based on the typename. From potentially 
      //an external assembly. Is it possible to use the extra types passed 
      //into an XMlSerializer Constructor???
      Type bType = ???

      // Somehow then need to deserialize B's Members
      // Deserialize X
      // Deserialize Y
   }

   public void WriteXml(System.Xml.XmlWriter writer)
   {
      // serialize other members as attributes

      writer.WriteStartElement("MyB");
      writer.WriteAttributeString("Type", this.MyB.GetType().ToString());
      this.MyB.WriteXml(writer);
      writer.WriteEndElement();
   }

   private void SeekElement(XmlReader reader, string elementName)
   {
      ReaderToNextNode(reader);
      while (reader.Name != elementName)
      {
         ReaderToNextNode(reader);
      }
   }

   private void ReaderToNextNode(XmlReader reader)
   {
      reader.Read();
      while (reader.NodeType == XmlNodeType.Whitespace)
      {
         reader.Read();
      }
   }
}

public interface IB : IXmlSerializable
{
}

public class B : IB
{

     public void ReadXml(XmlReader reader)
     {
         this.X = Convert.ToDouble(reader.GetAttribute("x"));
         this.Y = Convert.ToDouble(reader.GetAttribute("y"));
     }

   public void WriteXml(XmlWriter writer)
   {
      writer.WriteAttributeString("x", this.X.ToString());
      writer.WriteAttributeString("y", this.Y.ToString());
   }
}

注意:已更新，因为我意识到B应该使用接口IB.抱歉，您提出的问题有误.

NOTE : Updated as I realised B was supposed to use interface IB. Sorry for slightly wrong question.

推荐答案

要从字符串创建实例，请使用Activator.CreateInstance的重载之一.要仅获取具有该名称的类型，请使用Type.GetType.

To create an instance from a string, use one of the overloads of Activator.CreateInstance. To just get a type with that name, use Type.GetType.

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