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Beyond moving the required data into and out of a stream, formatters also analyze the members in the object graph for the following pieces of infrastructure: A check is made to determine whether the object is marked with the [Serializable] attribute. If the object is not, a SerializationException is thrown. If the object is marked [Serializable], a check is made to determine if the object implements the ISerializable interface. If this is the case, GetObjectData() is called on the object. If the object does not implement ISerializable, the default serialization process is used, serializing all fields not marked as [NonSerialized]. In addition to determining if the type supports ISerializable, formatters (as of .NET 2.0) are also responsible for discovering if the types in question support members that have been adorned with the [OnSerializing], [OnSerialized], [OnDeserializing], or [OnDeserialized] attribute. We ll examine the role of these attributes in just a bit, but first let s look at the role of ISerializable.

Objects that are marked [Serializable] have the option of implementing the ISerializable interface. By doing so, you are able to get involved with the serialization process and perform any pre- or post-data formatting. This interface is quite simple, given that it defines only a single method, GetObjectData(): // When you wish to tweak the serialization process, // implement ISerializable. public interface ISerializable { void GetObjectData(SerializationInfo info, StreamingContext context); } The GetObjectData() method is called automatically by a given formatter during the serialization process. The implementation of this method populates the incoming SerializationInfo parameter with a series of name/value pairs that (typically) map to the field data of the object being persisted. SerializationInfo defines numerous variations on the overloaded AddValue() method, in addition to a small set of properties that allow the type to get and set the type s name, defining assembly, and member count. Here is a partial snapshot:

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Figure 11-12. By setting the width property for radio buttons and submit buttons to auto, we ve corrected the oversized elements we had previously. Although we don t have any in this form, it s a good idea to set this for checkboxes anyway it future-proofs our form, so that if we add checkboxes, we needn t come back and style them.

We will focus heavily on classes and object-oriented development as we move on in this text. The ease of maintenance and high probability of reuse are well worth the extra planning required to build applications using these techniques. Once you are comfortable with these concepts, there really won t be much additional thought or planning required. It will be your natural process to work in an OOP fashion.

public sealed class SerializationInfo : object { public SerializationInfo(Type type, IFormatterConverter converter); public string AssemblyName { get; set; } public string FullTypeName { get; set; } public int MemberCount { get; } public void AddValue(string name, short value); public void AddValue(string name, UInt16 value); public void AddValue(string name, int value); .. } Types that implement the ISerializable interface must also define a special constructor taking the following signature: // You must supply a custom constructor with this signature // to allow the runtime engine to set the state of your object [Serializable] class SomeClass : ISerializable { private SomeClass (SerializationInfo si, StreamingContext ctx) {..} .. } Notice that the visibility of this constructor is set as private This is permissible given that the formatter will have access to this member regardless of its visibility.

These special constructors tend to be marked as private to ensure that the casual object user would never create an object in this manner As you can see, the first parameter of this constructor is an instance of the SerializationInfo type (seen previously) The second parameter of this special constructor is a StreamingContext type, which contains information regarding the source or destination of the bits The most informative member of this type is the State property, which represents a value from the StreamingContextStates enumeration The values of this enumeration represent the basic composition of the current stream To be honest, unless you are implementing some low-level custom remoting services, you will seldom need to deal with this enumeration directly Nevertheless, here are the possible names of the StreamingContextStates enum (consult the NET Framework 2.

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