Object serialization (5): application instance-> copying objects in large batches

This topic describes the application of serialization Technology in actual development.

After learning about the object serialization and deserialization methods, we naturally think that we can use them to implement object replication.

When the serialization technology is used for object replication, we will not serialize it to a file, but serialize it To the memory stream. Through deserialization, we can "Bulk clone" a large number of objects.

Example:

 Using System;
 Using System. Collections. Generic;
 Using System. text;
 Using System. runtime. serialization. formatters. Binary;
 Using System. runtime. serialization;
 Using System. IO;


 Namespace Objectclone2
{
[Serializable]
 Class Myclass
{
 Public   Int Index = 1 ;
}

 Class Program
{
 Static   Void Main ( String [] ARGs)
{
Myclass OBJ =New Myclass ();
 //  Create a memory stream object  
              Using (Memorystream MS = New Memorystream ())
{
Iformatter formator = New Binaryformatter ();
Formator. serialize (MS, OBJ ); //  Serialize an object to a memory stream

  //  Clone 100 objects 
                  For ( Int I = 0 ; I < 100 ; I ++)
{
Ms. Seek ( 0 , Seekorigin. Begin ); //  Return to the beginning of the stream  
 OBJ = (formator. deserialize (MS) As Myclass ); //  Deserialization object 
 OBJ. index + = I; //  Set object fields  
 Console. writeline ( "  The object {0} has been created.  " , Obj. Index );
}
}
Console. readkey ();
}
}
}

When using the above technology to clone objects, pay attention to the following points:

1. The class to be cloned must be marked as [serializable].

2. The read/write pointer of the memory stream should be moved back to the beginning at the end of each deserialization.

3. For objects with composite relationships, all classes involved in the composite must have the [serializable] Mark.

4. this technique completes object "deep replication", so if there is a circular reference inclusion relationship between objects, the Program may cause stack overflow and throw a stackoverflowexception exception.