串行化XML(二)

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串行化XML() 可以知道XML的序列化(Serialization)。它是这样一个过程:得到一个对象,把对象转换为一个XML文档,并且保存它以供使用,或者把它传到网络上其他地方以供使用。在.NET中,XML serialization通过检查类的属性是否被标志为read/write来工作。只要有其中一个属性,该类的值就会被取出并插入到一个XML文档里去。反序列化(De-serialization)则是一个相反的过程。

 

将一个对象串行化为xml后,再并行化,使其还原为原来的对象有时,在并行的xml当中可能存在意外的xml节点。

如果不处理这些意外的xml 的节点,XmlSerializer将忽略这些意外的节点,如果要处理这些意外节点,可以使用XmlSerializer的一下事件进行处理:

¨         UnknownNode

¨         UnknownElement 

¨         UnknownAttribute    

¨         UnreferencedObject

现在将book.xml的格式更改为:

<?xml version="1.0" encoding="utf-8"?>

<Book id="001" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

       <BookID>1</BookID>

       <BookName>数学</BookName>

       <Exception>Some Text</Exception>

</Book>

我们增加了一些意外的节点、属性,然后执行并行化过程:

Dim serializer As New Xml.Serialization.XmlSerializer(GetType(bookShop))

        AddHandler serializer.UnknownAttribute, AddressOf myUnknownAttribute

        AddHandler serializer.UnknownElement, AddressOf myUnknownElement

        AddHandler serializer.UnknownNode, AddressOf myUnknownNode

        Dim reader As System.IO.StreamReader = New System.IO.StreamReader("E:\serializer\book.xml")

        Dim a As bookShop = CType(serializer.Deserialize(reader), bookShop)

        reader.Close()

        Console.WriteLine("BookShop Name:" & a.BookName)

        Console.WriteLine("BookShop ID:" & a.BookID)

        Console.WriteLine("Print Enter to Exit.............")

        Console.ReadLine()

      我们同样增加了意外节点、属性的处理代码,执行结果为:

       

这样我们就可以查看那些意外的节点、属性的信息了。

    另外,我们还可以灵活的控制串行化xml 的格式,这样可以很方便的与外部应用程序进行交换对象。我们可以在类中加入.NET Framework属性来控制串行化xml 的格式。

       Imports System.Xml

Imports System.Xml.Serialization

<XmlRoot(elementname:="Root_Book", namespace:="URI:MylocalURI")> _

Public Class Book

    <XmlElement(elementname:="Book_ID", namespace:="URI:MylocalURI")> Public BookID As Integer

    <XmlAttributeAttribute(AttributeName:="Name")> _

    Public BookName As String

    <XmlText()> _

    Public test_Text As String

    <XmlIgnore()> _

Public IgnoreText As String

‘IgnoreText 将不被串行化

End Class

Module Serialization

    <STAThread()> _

   Public Sub main()

        Dim book As New book

        book.BookID = 1

        book.BookName = "数学"

        book.test_Text = "Some Text"

        book.IgnoreText = "IgnoreText"

        Dim serializer As New Xml.Serialization.XmlSerializer(GetType(book))

        Dim writer As System.IO.StreamWriter = New System.IO.StreamWriter("E:\serializer\book.xml")

        serializer.Serialize(writer, book)

        writer.Close()

    End Sub

End Module

则生成的XML格式为:

<?xml version="1.0" encoding="utf-8"?>

<Root_Book xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" Name="数学" xmlns="URI:MylocalURI">

       <Book_ID>1</Book_ID>

Some Text

</Root_Book>

 

    

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