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A reference to an object that contains any user-desired context information.
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State A set of bit flags indicating the source or destination of the objects being
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serialized/deserialized. The flags are:
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CrossProcess
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The source or destination is a different process on the same
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machine.
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CrossMachine The source or destination is on a different machine. File The source or destination is a file. Don t assume that same process will deserialize the data. Persistence The source or destination is a store such as a database, file, or other. Don t assume that same process will deserialize the data. Remoting The source or destination is remoting to an unknown location.
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The location might be on the same machine but might also be on another machine.
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Other The source or destination is unknown. Close The object graph is being cloned. The serialization code might
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assume that the same process will deserialize the data and it is therefore safe to access handles or other unmanaged resources.
Lesson 3: Custom Serialization
CrossAppDomain The source or destination is a different AppDomain. All The source or destination might be any of the above contexts. This is
the default context. To make context decisions during serialization and deserialization, implement the ISerialization interface in your class. For serialization, inspect the StreamingContext structure passed to your object s GetObjectData method. For deserialization, inspect the StreamingContext structure passed to your object s serialization constructor. If you are serializing or deserializing an object and want to provide context information, modify the IFormatter.Context StreamingContext property before calling the formatter s Serialize or Deserialize methods. This property is implemented by both the BinaryFormatter and SoapFormatter classes. When you construct a formatter, the formatter automatically sets the Context property to null and the State property to All.
How to Create a Custom Formatter
To create a custom formatter, implement the IFormatter or IGenericFormatter interface. Both BinaryFormatter and SoapFormatter implement the IFormatter interface. The FormatterServices class provides static methods (including GetObjectData) to aid with the implementation of a formatter.
NOTE .NET 2.0
Although IFormatter was available beginning with .NET 1.1, IGenericFormatter is new with .NET 2.0.
MORE INFO Custom Formatters
Very few people will need to implement custom formatters. Therefore, this book covers them at a very high level. For detailed information about custom formatters, read Format Your Way to Success with the .NET Framework Versions 1.1 and 2.0 at http://msdn.microsoft.com/msdnmag/issues/ 04/10/AdvancedSerialization/default.aspx.
Lab: Implement Custom Serialization
In this lab, you will modify a class to override the default serialization and take control over which members are serialized. If you encounter a problem completing an exercise, the completed projects are available on the companion CD in the Code folder.
5
Serialization
Exercise: Update a Class to Use Custom Serialization
In this exercise, you will update a class to improve the efficiency of serialization while maintaining complete control over how data is stored and retrieved. 1. Copy the 05\Lesson3-Serialize-People folder from the companion CD to your hard disk, and open either the C# version or the Visual Basic version of the Serialize-People project. 2. Add the System.Runtime.Serialization namespace to the Person class. 3. Add the Serializable attribute to the Person class, and then build the project to ensure it compiles correctly. 4. Modify the Person class so that it implements ISerializable. 5. Add the GetObjectData method, which accepts a SerializationInfo object and a StreamingContext object, and adds items to be serialized to the SerializationInfo object. Add the name and dateOfBirth variables to the SerializationInfo object, but do not add the age variable. Your code could look like the following:
' VB Public Overridable Sub GetObjectData(ByVal info As SerializationInfo, _ ByVal context As StreamingContext) _ Implements System.Runtime.Serialization.ISerializable.GetObjectData info.AddValue("Name", name) info.AddValue("DOB", dateOfBirth) End Sub // C# public virtual void GetObjectData(SerializationInfo info, StreamingContext context) { info.AddValue("Name", name); info.AddValue("DOB", dateOfBirth); }
6. Add the serialization constructor, which accepts a SerializationInfo object and a StreamingContext object, and then initializes member variables using the contents of the SerializationInfo object. Use the same element names you used in the previous step. After you have deserialized all variables, call the CalculateAge method to initialize the age variables. Your code could look like the following:
' VB Public Sub New(ByVal info As SerializationInfo, _ ByVal context As StreamingContext) name = info.GetString("Name")
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