解决方法
这是一个简单的代理反序列化助手的例子:
给定一个类型,我们不能直接控制在类级别的序列化:
public sealed class Class //contrived example { public string Property {get;set;} }
而我们需要反序列化的xml:
<Class> <Property>Value</Property> </Class>
您可以创建一个代理类型来手动处理目标类型的反序列化过程,如下所示:
[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,我们可以清理一下最后一个(EXCEPT EXCEPTION HANDLING)版本的调用站点:
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
public interface ISerializerProxy<TInstanceType> where TInstanceType : class { TInstanceType Value { get; } }
示例代理现在实现了新的接口
[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字符串的扩展方法,可以与任何代理类型一起使用.
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; } } }