我有一个客户端应用程序提供的
XML文档到我的C#应用程序.这是客户端如何发送XML文件：
<?xml version="1.0" encoding="utf-8"?>
<SomeAccount>
<parentId>2380983</parentId>
<!-- more elements -->
</SomeAccount>
还有一个支持XML反序列化的C#类：
[XmlRoot]
public class SomeAccount
{
[XmlElement("parentId")]
public long ParentId { get; set; }
//rest of fields...
}
但是有些客户端系统以这种方式发送XML(请注意LeParentId中的大写字母)：
<?xml version="1.0" encoding="utf-8"?>
<SomeAccount>
<LeParentId>2380983</LeParentId>
<!-- similar for the other elements -->
</SomeAccount>
我如何使此字段(和其他人)同时支持XML名称parentId和LeParentId？
这是我目前用于XML反序列化的方法：
public sealed class XmlSerializationUtil
{
public static T Deserialize<T>(string xml)
{
if (xml == null)
return default(T);
XmlSerializer serializer = new XmlSerializer(typeof(T));
StringReader stringReader = new StringReader(xml);
return (T)serializer.Deserialize(stringReader);
}
}
解决方法
采取2 – 让我们使用未知的元素处理事件来实现这一点(请参见下面的注释,但是有一些限制)：
public class XmlSynonymDeserializer : XmlSerializer
{
public class SynonymsAttribute : Attribute
{
public readonly ISet<string> Names;
public SynonymsAttribute(params string[] names)
{
this.Names = new HashSet<string>(names);
}
public static MemberInfo GetMember(object obj,string name)
{
Type type = obj.GetType();
var result = type.GetProperty(name);
if (result != null)
return result;
foreach (MemberInfo member in type.GetProperties().Cast<MemberInfo>().Union(type.GetFields()))
foreach (var attr in member.GetCustomAttributes(typeof(SynonymsAttribute),true))
if (attr is SynonymsAttribute && ((SynonymsAttribute)attr).Names.Contains(name))
return member;
return null;
}
}
public XmlSynonymDeserializer(Type type)
: base(type)
{
this.UnknownElement += this.SynonymHandler;
}
public XmlSynonymDeserializer(Type type,XmlRootAttribute root)
: base(type,root)
{
this.UnknownElement += this.SynonymHandler;
}
protected void SynonymHandler(object sender,XmlElementEventArgs e)
{
var member = SynonymsAttribute.GetMember(e.ObjectBeingDeserialized,e.Element.Name);
Type memberType;
if (member != null && member is FieldInfo)
memberType = ((FieldInfo)member).FieldType;
else if (member != null && member is PropertyInfo)
memberType = ((PropertyInfo)member).PropertyType;
else
return;
if (member != null)
{
object value;
XmlSynonymDeserializer serializer = new XmlSynonymDeserializer(memberType,new XmlRootAttribute(e.Element.Name));
using (System.IO.StringReader reader = new System.IO.StringReader(e.Element.OuterXml))
value = serializer.Deserialize(reader);
if (member is FieldInfo)
((FieldInfo)member).SetValue(e.ObjectBeingDeserialized,value);
else if (member is PropertyInfo)
((PropertyInfo)member).SetValue(e.ObjectBeingDeserialized,value);
}
}
}
现在类的实际代码是：
[XmlRoot]
public class SomeAccount
{
[XmlElement("parentId")]
[XmlSynonymDeserializer.Synonyms("LeParentId","AnotherGreatName")]
public long ParentId { get; set; }
//rest of fields...
}
要反序列化,只需使用XmlSynonymDeserializer而不是常规的XmlSerializer.这应该适用于大多数基本需求.
已知限制：
>此实现仅支持具有多个名称的元素;扩展它的属性应该是微不足道的>在实体继承彼此的情况下,对属性/字段的处理的支持未被测试>此实现不检查编程错误(具有只读/常量字段/属性的属性,具有相同同义词的多个成员等)
