Serialization technology（序列化技术）

Serialization technology（序列化技术）

一、为什么要用序列化技术
主要作用：
1.Persistence(持久化对象)：序列化到一个文件系统中
Store and retrieve a graph of objects to and from a file
2..Net Remoting
Pass by value arguments that are transmitted between processes
二、Serialization Attributes
1.To Mark a Class, Use Serializable Attribute
[Serializable] public class MyClass {}
2.To Skip Specified Members, Use NonSerialized Attribute
[Serializable] public class MyClass {   [NonSerialized] int _cashSize; //... }
3.To Provide Custom Serialization, Implement ISerializable
三、Object Graph
Serialization Manage Automatically
四、Serialization Process（序列化过程）
Classes Used by the Default Serialization Process
  ObjectIDGenerator – generates IDs for objects
  ObjectManager – tracks objects as they are being deserialized
Examples of Classes Used with Serialized Streams
  FileStream, MemoryStream, NetworkStream
Formatter Class
  Writes or reads data in a specified format to the output or input streams
  Runtime provides BinaryFormatter , SoapFormatter and XmlSerializer
五、Serialize Class and object
Example:
class SerializeExample
 { 
  public static void Main(String[] args)
  { // create the object graph
   ArrayList l = new ArrayList();
   for (int x=0; x< 100; x++)
   {
    l.Add (x);
   }
   // create the filestream
   FileStream s = File.Create("foo.bin");
   // create the BinaryFormatter
   BinaryFormatter b = new BinaryFormatter();
   // serialize the graph to the stream
   b.Serialize(s, l);
   s.Close();
  }
 }
六、Deserialize Class and object
Example:
   class DeSerialize
 {
  public static void Main(String[] args)
  { // open the filestream
   FileStream s = File.OpenRead("foo.bin"); 
   // create the formatter
   BinaryFormatter b = new BinaryFormatter(); 
   // deserialize
   ArrayList p = (ArrayList) b.Deserialize(s); s.Close();
   // print out the new object graph
   // see module text for PrintValues’ code
   PrintValues(p);
  }
  }
七、Security Issues
Serialization Handles an Object’s Private Data
If private data is sensitive, consider encrypting the stream before transmitting or saving to a disk
System.Security.Cryptography namespace contains classes to perform cryptography The CryptoStream class can be used to encrypt streams of serialized data