IDeserializationCallback Interface
.NET Framework 2.0
Indicates that a class is to be notified when deserialization of the entire object graph has been completed.
Namespace: System.Runtime.Serialization
Assembly: mscorlib (in mscorlib.dll)
Assembly: mscorlib (in mscorlib.dll)
Notes to Implementers
Implement the current interface as part of support for a method that is called when deserialization of the object graph is complete.
If an object needs to execute code on its child objects, it can delay this action, implement IDeserializationCallback, and execute the code only when it is called back on this interface.
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
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
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
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.
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