是否可以在不实现IXmlSerializable的情况下为XmlSerializer提供自定义序列化? [英] Can I provide custom serialization for XmlSerializer without implementing IXmlSerializable?
问题描述
我们正在使用 XmlSerializer
,我想为某些类提供自定义序列化。但是,我并不总是能够修改相关类的源代码,否则我只能使其实现 IXmlSerializable
。
We're using XmlSerializer
, and I want to provide custom serialization for certain classes. However, I don't always have the ability to modify the source code of the class in question, otherwise I could just make it implement IXmlSerializable
. Is there any way to do this?
推荐答案
下面是代理反序列化助手的一个简单示例:
Here's a simple example of the proxy deserialize helper:
给出了一个我们不能直接在类级别控制序列化的类型:
Given a type that we cannot directly control serialization of at the class level:
public sealed class Class //contrived example
{
public string Property {get;set;}
}
和我们需要反序列化的xml:
And the xml we need to deserialize with:
<Class>
<Property>Value</Property>
</Class>
您可以创建代理类型来手动处理目标类型的反序列化过程,如下所示:
You could create a proxy type to manually process the deserialization process of the target type like so:
[XmlRoot("Class")] // <-- Very important
public sealed class ClassSerializerProxy : IXmlSerializable
{
public Class ClassValue {get;set;}
public System.Xml.Schema.XmlSchema GetSchema(){return null;}
public void WriteXml(System.Xml.XmlWriter writer){}
public void ReadXml(System.Xml.XmlReader reader)
{
var x = XElement.ReadFrom(reader) as XElement;
this.ClassValue = new Class();
//again this is a simple contrived example
this.ClassValue.Property = x.XPathSelectElement("Property").Value;
}
}
用法是:
void Main()
{
// get the xml value somehow
var xdoc= XDocument.Parse(@"<Class><Property>Value</Property></Class>");
// deserialize the xml into the proxy type
var proxy = Deserialize<ClassSerializerProxy>(xdoc);
// read the resulting value
var value = proxy.ClassValue;
}
public object Deserialize(XDocument xmlDocument, Type DeserializeToType)
{
XmlSerializer xmlSerializer = new XmlSerializer(DeserializeToType);
using (XmlReader reader = xmlDocument.CreateReader())
return xmlSerializer.Deserialize(reader);
}
现在抛出一些泛型和扩展方法,我们可以清理调用最终版本(例外处理)版本:
Now throw in some generics and an extension method, and we can clean the call site up a bit for a final (EXCEPT EXCEPTION HANDLING) version:
用法:
void Main()
{
var xml = @"<Class><Property>Value</Property></Class>";
var value = xml.DeserializeWithProxy<ClassSerializerProxy,Class>();
value.Dump();
}
您的实例类型:
public sealed class Class
{
public string Property {get;set;}
}
代理类型必须实现的接口
An interface that proxy types must implement
public interface ISerializerProxy<TInstanceType> where TInstanceType : class
{
TInstanceType Value { get; }
}
示例代理现在实现了新接口
The example proxy now implements the new interface
[XmlRoot("Class")]
public sealed class ClassSerializerProxy : IXmlSerializable, ISerializerProxy<Class>
{
public Class Value {get;set;}
public System.Xml.Schema.XmlSchema GetSchema(){return null;}
public void WriteXml(System.Xml.XmlWriter writer){}
public void ReadXml(System.Xml.XmlReader reader)
{
var x = XElement.ReadFrom(reader) as XElement;
this.Value = new Class();
this.Value.Property = x.XPathSelectElement("Property").Value;
}
}
反序列化方法现在是<$的扩展方法c $ c> string ,可以与任何代理类型一起使用。
The deserialization method is now an extension method on string
and can be used with any proxy type.
public static class ExtensionMethods
{
public static TInstanceType DeserializeWithProxy<TProxyType,TInstanceType>(this string xml)
where TProxyType : ISerializerProxy<TInstanceType>
where TInstanceType : class
{
using (XmlReader reader = XDocument.Parse(xml).CreateReader())
{
var xmlSerializer = new XmlSerializer(typeof(TProxyType));
return (xmlSerializer.Deserialize(reader) as ISerializerProxy<TInstanceType>).Value;
}
}
}
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