NetDataContractSerializer 類別

定義

public ref class NetDataContractSerializer sealed : System::Runtime::Serialization::XmlObjectSerializer, System::Runtime::Serialization::IFormatter

public sealed class NetDataContractSerializer : System.Runtime.Serialization.XmlObjectSerializer, System.Runtime.Serialization.IFormatter

type NetDataContractSerializer = class
    inherit XmlObjectSerializer
    interface IFormatter

Public NotInheritable Class NetDataContractSerializer
Inherits XmlObjectSerializer
Implements IFormatter

繼承

Object

XmlObjectSerializer

NetDataContractSerializer

實作

IFormatter

範例

以下範例程式碼顯示一個名為 Person 的型別，該型別被序列化為 NetDataContractSerializer。 屬性 DataContractAttribute 套用到類別，而 則 DataMemberAttribute 套用到成員（包括一個私有成員）以指示 NetDataContractSerializer 要序列化的 what。

// You must apply a DataContractAttribute or SerializableAttribute
// to a class to have it serialized by the NetDataContractSerializer.
[DataContract(Name = "Customer", Namespace = "http://www.contoso.com")]
class Person : IExtensibleDataObject
{
    [DataMember()]
    public string FirstName;
    [DataMember]
    public string LastName;
    [DataMember()]
    public int ID;

    public Person(string newfName, string newLName, int newID)
    {
        FirstName = newfName;
        LastName = newLName;
        ID = newID;
    }

    private ExtensionDataObject extensionData_Value;

    public ExtensionDataObject ExtensionData
    {
        get
        {
            return extensionData_Value;
        }
        set
        {
            extensionData_Value = value;
        }
    }
}

public sealed class Test
{
    private Test() { }

    public static void Main()
    {
        try
        {
            WriteObject("NetDataContractSerializerExample.xml");
            ReadObject("NetDataContractSerializerExample.xml");
        }

        catch (SerializationException serExc)
        {
            Console.WriteLine("Serialization Failed");
            Console.WriteLine(serExc.Message);
        }
        catch (Exception exc)
        {
            Console.WriteLine(
            "The serialization operation failed: {0} StackTrace: {1}",
            exc.Message, exc.StackTrace);
        }

        finally
        {
            Console.WriteLine("Press <Enter> to exit....");
            Console.ReadLine();
        }
    }

    public static void WriteObject(string fileName)
    {
        Console.WriteLine(
            "Creating a Person object and serializing it.");
        Person p1 = new Person("Zighetti", "Barbara", 101);
        FileStream fs = new FileStream(fileName, FileMode.Create);
        XmlDictionaryWriter writer = XmlDictionaryWriter.CreateTextWriter(fs);
        NetDataContractSerializer ser =
            new NetDataContractSerializer();
        ser.WriteObject(writer, p1);
        writer.Close();
    }

    public static void ReadObject(string fileName)
    {
        Console.WriteLine("Deserializing an instance of the object.");
        FileStream fs = new FileStream(fileName,
        FileMode.Open);
        XmlDictionaryReader reader =
            XmlDictionaryReader.CreateTextReader(fs, new XmlDictionaryReaderQuotas());
        NetDataContractSerializer ser = new NetDataContractSerializer();

        // Deserialize the data and read it from the instance.
        Person deserializedPerson =
            (Person)ser.ReadObject(reader, true);
        fs.Close();
        Console.WriteLine(String.Format("{0} {1}, ID: {2}",
        deserializedPerson.FirstName, deserializedPerson.LastName,
        deserializedPerson.ID));
    }
}

' You must apply a DataContractAttribute or SerializableAttribute
' to a class to have it serialized by the NetDataContractSerializer.
<DataContract(Name := "Customer", [Namespace] := "http://www.contoso.com")>  _
Class Person
    Implements IExtensibleDataObject
    <DataMember()>  _
    Public FirstName As String
    <DataMember()>  _
    Public LastName As String
    <DataMember()>  _
    Public ID As Integer
    
    
    Public Sub New(ByVal newfName As String, ByVal newLName As String, _
       ByVal newID As Integer) 
        FirstName = newfName
        LastName = newLName
        ID = newID
    
    End Sub 
    
    Private extensionData_Value As ExtensionDataObject
    
    
    Public Property ExtensionData() As ExtensionDataObject _
     Implements IExtensibleDataObject.ExtensionData
        Get
            Return extensionData_Value
        End Get
        Set
            extensionData_Value = value
        End Set
    End Property
End Class 


NotInheritable Public Class Test

    Private Sub New() 
    
    End Sub
     
    Public Shared Sub Main() 
        Try
            WriteObject("NetDataContractSerializerExample.xml")
            ReadObject("NetDataContractSerializerExample.xml")
        
        Catch serExc As SerializationException
            Console.WriteLine("Serialization Failed")
            Console.WriteLine(serExc.Message)
        Catch exc As Exception
            Console.WriteLine("The serialization operation failed: {0} StackTrace: {1}", exc.Message, exc.StackTrace)
        
        Finally
            Console.WriteLine("Press <Enter> to exit....")
            Console.ReadLine()
        End Try
    
    End Sub 
    
    
    Public Shared Sub WriteObject(ByVal fileName As String) 
        Console.WriteLine("Creating a Person object and serializing it.")
        Dim p1 As New Person("Zighetti", "Barbara", 101)
        Dim fs As New FileStream(fileName, FileMode.Create)
        Dim writer As XmlDictionaryWriter = XmlDictionaryWriter.CreateTextWriter(fs)
        Dim ser As New System.Runtime.Serialization.NetDataContractSerializer()

        ser.WriteObject(writer, p1)
        writer.Close()
    
    End Sub     

    Public Shared Sub ReadObject(ByVal fileName As String) 
        Console.WriteLine("Deserializing an instance of the object.")
        Dim fs As New FileStream(fileName, FileMode.Open)
        Dim reader As XmlDictionaryReader = _
           XmlDictionaryReader.CreateTextReader(fs, New XmlDictionaryReaderQuotas())
        Dim ser As New System.Runtime.Serialization.NetDataContractSerializer()
        
        ' Deserialize the data and read it from the instance.
        Dim deserializedPerson As Person = CType(ser.ReadObject(reader, True), Person)
        fs.Close()
        Console.WriteLine(String.Format("{0} {1}, ID: {2}", deserializedPerson.FirstName, deserializedPerson.LastName, deserializedPerson.ID))
    
    End Sub 
End Class

備註

安全性

NetDataContractSerializer 不安全感。 如需詳細資訊，請參閱 BinaryFormatter 安全性指南。

與 NetDataContractSerializer 有 DataContractSerializer 一點重要差異：在 NetDataContractSerializer 序列化 XML 中包含 CLR 類型資訊，而 則 DataContractSerializer 沒有。 因此，只有當序列化與反序列化兩端共享相同的 CLR 類型時，才能 NetDataContractSerializer 使用

序列化器可以序列化已套用 or SerializableAttribute 屬性的DataContractAttribute類型。 它也會序列化實作 ISerializable的型別。

欲了解更多序列化相關資訊，請參閱 序列化與反序列化。

與 XElement 不相容

此 XElement 類別用於撰寫 XML。 然而，無法 NetDataContractSerializer 序列化該類型的實例。 因此，以下程式碼在例外情況下失敗：「根型別 'System.Xml.Linq.XElement' 在 NetDataContractSerializer 頂層不支援，因為它可透過 IsAny=true IXmlSerializiz，且必須寫入所有內容，包括根元素。」

FileStream fs = new FileStream("mystuff.xml", FileMode.Create, FileAccess.ReadWrite);
XElement myElement = new XElement("Parent", new XElement("child1", "form"),
    new XElement("child2", "base"),
    new XElement("child3", "formbase")
    );
NetDataContractSerializer dcs = new NetDataContractSerializer();
dcs.WriteObject(fs, myElement);

Dim fs As New FileStream("mystuff.xml", FileMode.Create, FileAccess.ReadWrite)
Dim myElement As New XElement("Parent", New XElement("child1", "form"), _
    New XElement("child2", "base"), _
    New XElement("child3", "formbase") _
    )
Dim ser As New System.Runtime.Serialization. _
  NetDataContractSerializer()
ser.WriteObject(fs, myElement)

然而，如果 被 XElement 用作類別欄位或屬性的型別，該欄位或屬性所包含的資料會被序列化。 這是因為作為類別成員，資料並非類別的頂層。

另請參閱

• DataContractSerializer
• NetDataContractSerializer
• XmlObjectSerializer
• 串行化和還原串行化