[英]Why does XMLSerializer take DefaultValue Attribute of base class to serialize
using System.ComponentModel;
using System.IO;
using System.Xml.Serialization;
namespace SerializerTest {
static class Program {
static void Main() {
using (TextWriter textWriter = new StreamWriter("data.xml")) {
Data data = new Data();
new XmlSerializer(typeof(Data)).Serialize(textWriter, data);
textWriter.Close();
}
using (TextWriter textWriter = new StreamWriter("exData.xml")) {
ExData exData = new ExData();
new XmlSerializer(typeof(ExData)).Serialize(textWriter, exData);
textWriter.Close();
}
}
}
public class Data {
[DefaultValue(10)] public int A { get; set; }
public Data() { A = 10; }
}
public class ExData : Data {
[DefaultValue(20)] public new int A { get; set; }
public ExData() { A = 20; }
}
}
While the first serialization is as i expect (non-serialization of default value): 虽然第一次序列化是我所期望的(默认值的非序列化):
<?xml version="1.0" encoding="utf-8" ?>
<Data xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" />
the second results in: 第二个结果是:
<?xml version="1.0" encoding="utf-8"?>
<ExData xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<A>20</A>
</ExData>
Obviously XmlSerializer takes the default value of the base class instead of taking the new one. 显然,XmlSerializer采用基类的默认值,而不采用新的默认值。 Overiding a virtual property with "override" gives the same result.
用“替代”覆盖虚拟属性会得到相同的结果。 Changing the initialization of ExData's property A to 10 results in not serializing this property as if the default value of the base class property is applied.
将ExData的属性A的初始化更改为10会导致未序列化此属性,就像应用基类属性的默认值一样。 Can anybody explain this behaviour to me?
有人可以向我解释这种行为吗? Does anybody know a work around to this?
有人知道解决此问题的方法吗?
My aim is to non-serialize default values but changing default value for a derived class. 我的目标是非序列化默认值,但更改派生类的默认值。
The XmlSerializer
seems to get only the first DefaultValueAttribute
and I unfortunately think there's no direct workaround to what you need. XmlSerializer
似乎只获得第一个DefaultValueAttribute
,但不幸的是,我认为没有直接的替代方法可以解决您所需要的问题。 You can however implement IXmlSerializable
and do that kind stuff yourself. 但是,您可以实现
IXmlSerializable
并自己做这种事情。
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