我正在尝试使用XmlSerializer序列化和反序列化类的层次结构。序列化工作正常,但是当我尝试反序列化时,我得到了这个例外:
System.InvalidOperationException:XML文档中存在错误(2,2)。 ---> System.InvalidOperationException:不期望
<Derived xmlns=''>
。
这是我尝试反序列化的xml:
<?xml version="1.0"?>
<Derived xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<BaseStr>Base</BaseStr>
<DerivedStr>Derived</DerivedStr>
</Derived>
这是我正在使用的代码:
using System;
using System.IO;
using System.Text;
using System.Xml;
using System.Xml.Serialization;
[XmlInclude(typeof(Derived))]
public abstract class Base
{
public string BaseStr { get; set; }
}
public class Derived : Base
{
public string DerivedStr { get; set; }
}
class Program
{
static void Main(string[] args)
{
try
{
XmlSerializer serializer = new XmlSerializer(typeof(Derived));
MemoryStream ms = new MemoryStream();
serializer.Serialize(ms, new Derived() { DerivedStr = "Derived", BaseStr = "Base" });
Console.WriteLine(Encoding.ASCII.GetChars(ms.ToArray()));
ms.Position = 0;
XmlSerializer deserializer = new XmlSerializer(typeof(Base));
Base b = (Base)deserializer.Deserialize(ms);
Console.WriteLine(b.GetType().Name);
}
catch(Exception ex)
{
Console.WriteLine();
Console.WriteLine(ex.ToString());
}
}
}
为什么反序列化不起作用?我怎样才能让它发挥作用?
答案 0 :(得分:3)
您正在创建XmlSerializer
期望仅对Base
个对象进行反序列化。它不期望看到<Derived>
元素。如果你使用
XmlSerializer deserializer = new XmlSerializer(typeof(Derived));
你没有得到例外。或者,当您序列化 Derived
的实例时,您可以使用将生成<Base>
元素的序列化程序:
XmlSerializer serializer = new XmlSerializer(typeof(Base));
这仍将反序列化为Derived
的实例,因为XML将包含
xsi:type="Derived"
基本上,您的序列化器和反序列化器需要使用相同的类型构建。