IDeserializationCallback 接口

指示在完成整个对象图形的反序列化时通知类。

**命名空间:**System.Runtime.Serialization
**程序集:**mscorlib（在 mscorlib.dll 中）

语法

声明
<ComVisibleAttribute(True)> _
Public Interface IDeserializationCallback
用法
Dim instance As IDeserializationCallback

[ComVisibleAttribute(true)] 
public interface IDeserializationCallback

[ComVisibleAttribute(true)] 
public interface class IDeserializationCallback

/** @attribute ComVisibleAttribute(true) */ 
public interface IDeserializationCallback

ComVisibleAttribute(true) 
public interface IDeserializationCallback

备注

给实现者的说明 实现当前接口，以作为对在完成对象图形反序列化时所调用的方法的部分支持。 如果一个对象需要在其子对象上执行代码，它可以延迟此操作，实现 IDeserializationCallback，然后仅在此接口上回调代码才执行该代码。

示例

Imports System
Imports System.IO
Imports System.Collections
Imports System.Runtime.Serialization.Formatters.Binary
Imports System.Runtime.Serialization

' This class is serializable and will have its OnDeserialization method
' called after each instance of this class is deserialized.
<Serializable()> Class Circle
   Implements IDeserializationCallback
   Private m_radius As Double

   ' To reduce the size of the serialization stream, the field below is 
   ' not serialized. This field is calculated when an object is constructed
   ' or after an instance of this class is deserialized.
   <NonSerialized()> Public m_area As Double

   Public Sub New(ByVal radius As Double)
      m_radius = radius
      m_area = Math.PI * radius * radius
   End Sub

   Private Sub OnDeserialization(ByVal sender As Object) _
      Implements IDeserializationCallback.OnDeserialization
      ' After being deserialized, initialize the m_area field 
      ' using the deserialized m_radius value.
      m_area = Math.PI * m_radius * m_radius
   End Sub

   Public Overrides Function ToString() As String
      Return String.Format("radius={0}, area={1}", m_radius, m_area)
   End Function
End Class


Class Class1
   <STAThread()> Shared Sub Main()
      Serialize()
      Deserialize()
   End Sub

   Shared Sub Serialize()
      Dim c As New Circle(10)
      Console.WriteLine("Object being serialized: " + c.ToString())

      ' To serialize the Circle, you must first open a stream for 
      ' writing. Use a file stream here.
      Dim fs As New FileStream("DataFile.dat", FileMode.Create)

      ' Construct a BinaryFormatter and use it 
      ' to serialize the data to the stream.
      Dim formatter As New BinaryFormatter
      Try
         formatter.Serialize(fs, c)
      Catch e As SerializationException
         Console.WriteLine("Failed to serialize. Reason: " + e.Message)
         Throw
      Finally
         fs.Close()
      End Try
   End Sub


   Shared Sub Deserialize()
      ' Declare the Circle reference
      Dim c As Circle = Nothing

      ' Open the file containing the data that you want to deserialize.
      Dim fs As New FileStream("DataFile.dat", FileMode.Open)
      Try
         Dim formatter As New BinaryFormatter

         ' Deserialize the Circle from the file and 
         ' assign the reference to the local variable.
         c = CType(formatter.Deserialize(fs), Circle)
      Catch e As SerializationException
         Console.WriteLine("Failed to deserialize. Reason: " + e.Message)
         Throw
      Finally
         fs.Close()
      End Try

      ' To prove that the Circle deserialized correctly, display its area.
      Console.WriteLine("Object being deserialized: " + c.ToString())
   End Sub
End Class

using System;
using System.IO;
using System.Collections;
using System.Runtime.Serialization.Formatters.Binary;
using System.Runtime.Serialization;

// This class is serializable and will have its OnDeserialization method
// called after each instance of this class is deserialized.
[Serializable]
class Circle : IDeserializationCallback 
{
    Double m_radius;

    // To reduce the size of the serialization stream, the field below is 
    // not serialized. This field is calculated when an object is constructed
    // or after an instance of this class is deserialized.
    [NonSerialized] public Double m_area;

    public Circle(Double radius) 
    {
        m_radius = radius;
        m_area = Math.PI * radius * radius;
    }

    void IDeserializationCallback.OnDeserialization(Object sender) 
    {
        // After being deserialized, initialize the m_area field 
        // using the deserialized m_radius value.
        m_area = Math.PI * m_radius * m_radius;
    }

    public override String ToString() 
    {
        return String.Format("radius={0}, area={1}", m_radius, m_area);
    }
}


class Class1 
{
    [STAThread]
    static void Main(string[] args) 
    {
        Serialize();
        Deserialize();
    }

    static void Serialize() 
    {
        Circle c = new Circle(10);
        Console.WriteLine("Object being serialized: " + c.ToString());

        // To serialize the Circle, you must first open a stream for 
        // writing. Use a file stream here.
        FileStream fs = new FileStream("DataFile.dat", FileMode.Create);

        // Construct a BinaryFormatter and use it 
        // to serialize the data to the stream.
        BinaryFormatter formatter = new BinaryFormatter();
        try 
        {
            formatter.Serialize(fs, c);
        }
        catch (SerializationException e) 
        {
            Console.WriteLine("Failed to serialize. Reason: " + e.Message);
            throw;
        }
        finally 
        {
            fs.Close();
        }
    }

   
    static void Deserialize() 
    {
        // Declare the Circle reference.
        Circle c = null;

        // Open the file containing the data that you want to deserialize.
        FileStream fs = new FileStream("DataFile.dat", FileMode.Open);
        try 
        {
            BinaryFormatter formatter = new BinaryFormatter();

            // Deserialize the Circle from the file and 
            // assign the reference to the local variable.
            c = (Circle) formatter.Deserialize(fs);
        }
        catch (SerializationException e) 
        {
            Console.WriteLine("Failed to deserialize. Reason: " + e.Message);
            throw;
        }
        finally 
        {
            fs.Close();
        }

        // To prove that the Circle deserialized correctly, display its area.
        Console.WriteLine("Object being deserialized: " + c.ToString());
    }
}

using namespace System;
using namespace System::IO;
using namespace System::Collections;
using namespace System::Runtime::Serialization::Formatters::Binary;
using namespace System::Runtime::Serialization;

// This class is serializable and will have its OnDeserialization method
// called after each instance of this class is deserialized.

[Serializable]
ref class Circle: public IDeserializationCallback
{
private:
   Double m_radius;

public:

   // To reduce the size of the serialization stream, the field below is 
   // not serialized. This field is calculated when an object is constructed
   // or after an instance of this class is deserialized.

   [NonSerialized]
   Double m_area;
   Circle( Double radius )
   {
      m_radius = radius;
      m_area = Math::PI * radius * radius;
   }

   virtual void OnDeserialization( Object^ /*sender*/ )
   {
      // After being deserialized, initialize the m_area field 
      // using the deserialized m_radius value.
      m_area = Math::PI * m_radius * m_radius;
   }

   virtual String^ ToString() override
   {
      return String::Format( "radius= {0}, area= {1}", m_radius, m_area );
   }
};

void Serialize()
{
   Circle^ c = gcnew Circle( 10 );
   Console::WriteLine( "Object being serialized: {0}", c );

   // To serialize the Circle, you must first open a stream for 
   // writing. We will use a file stream here.
   FileStream^ fs = gcnew FileStream( "DataFile.dat",FileMode::Create );

   // Construct a BinaryFormatter and use it to serialize the data to the stream.
   BinaryFormatter^ formatter = gcnew BinaryFormatter;
   try
   {
      formatter->Serialize( fs, c );
   }
   catch ( SerializationException^ e ) 
   {
      Console::WriteLine( "Failed to serialize. Reason: {0}", e->Message );
      throw;
   }
   finally
   {
      fs->Close();
   }
}

void Deserialize()
{
   // Declare the Circle reference.
   Circle^ c = nullptr;

   // Open the file containing the data that we want to deserialize.
   FileStream^ fs = gcnew FileStream( "DataFile.dat",FileMode::Open );
   try
   {
      BinaryFormatter^ formatter = gcnew BinaryFormatter;

      // Deserialize the Circle from the file and 
      // assign the reference to our local variable.
      c = dynamic_cast<Circle^>(formatter->Deserialize( fs ));
   }
   catch ( SerializationException^ e ) 
   {
      Console::WriteLine( "Failed to deserialize. Reason: {0}", e->Message );
      throw;
   }
   finally
   {
      fs->Close();
   }

   // To prove that the Circle deserialized correctly, display its area.
   Console::WriteLine( "Object being deserialized: {0}", c );
}

[STAThread]
int main()
{
   Serialize();
   Deserialize();
}

import System.*;
import System.IO.*;
import System.Collections.*;
import System.Runtime.Serialization.Formatters.Binary.*;
import System.Runtime.Serialization.*;

// This class is serializable and will have its OnDeserialization method
// called after each instance of this class is deserialized.
/** @attribute Serializable()
 */
class Circle implements IDeserializationCallback
{
    private double mRadius;

    // To reduce the size of the serialization stream, the field below is 
    // not serialized. This field is calculated when an object is constructed
    // or after an instance of this class is deserialized.
    /** @attribute NonSerialized()
     */
    public double mArea;

    public Circle(double radius)
    {
        mRadius = radius;
        mArea = Math.PI * radius * radius;
    } //Circle

    public void OnDeserialization(Object sender)
    {
        // After being deserialized, initialize the mArea field 
        // using the deserialized mRadius value.
        mArea = Math.PI * mRadius * mRadius;
    } //IDeserializationCallback.OnDeserialization

    public String ToString()
    {
        return String.Format("radius={0}, area={1}",
            System.Convert.ToString(mRadius),System.Convert.ToString(mArea));
    } //ToString
} //Circle

class Class1
{
    /** @attribute STAThread()
     */
    public static void main(String[] args) throws SerializationException 
    {
        Serialize();
        try {
            Deserialize();
        }
        catch (SerializationException e) { 
        }
    } //main

    static void Serialize() throws SerializationException 
    {
        Circle c = new Circle(System.Convert.ToDouble(10));
        Console.WriteLine("Object being serialized: " + c.ToString());

        // To serialize the Circle, you must first open a stream for 
        // writing. Use a file stream here.
        FileStream fs = new FileStream("DataFile.dat", FileMode.Create);
        // Construct a BinaryFormatter and use it 
        // to serialize the data to the stream.
        BinaryFormatter formatter = new BinaryFormatter();

        try {
            formatter.Serialize(fs, c);
        }
        catch (SerializationException e) {
            Console.WriteLine("Failed to serialize. Reason: " 
                + e.get_Message());
            throw e;
        }
        finally {
            fs.Close();
        }
    } //Serialize

    static void Deserialize() throws SerializationException
    {
        // Declare the Circle reference.
        Circle c = null;

        // Open the file containing the data that you want to deserialize.
        FileStream fs = new FileStream("DataFile.dat", FileMode.Open);

        try {
            BinaryFormatter formatter = new BinaryFormatter();
            // Deserialize the Circle from the file and 
            // assign the reference to the local variable.
            c = (Circle)(formatter.Deserialize(fs));
        }
        catch (SerializationException e) {
            Console.WriteLine("Failed to deserialize. Reason: " 
                + e.get_Message());
            throw e;
        }
        finally {
            fs.Close();
        }
        // To prove that the Circle deserialized correctly, display its area.
        Console.WriteLine("Object being deserialized: " + c.ToString());
    } //Deserialize
} //Class1

平台

Windows 98、Windows 2000 SP4、Windows Millennium Edition、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition

.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。

版本信息

.NET Framework

受以下版本支持：2.0、1.1、1.0

请参见

参考

IDeserializationCallback 成员
System.Runtime.Serialization 命名空间

其他资源

事件和委托
XML 和 SOAP 序列化