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Up to now, I ve been discussing how to modify a type s implementation to control how a type serializes and deserializes instances of itself . However, the formatters also allow code that is not part of the type s implementation to override how a type serializes and deserializes its objects . There are two main reasons why application code might want to override a type s behavior:

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It allows a developer the ability to serialize a type that was not originally designed to be serialized . It allows a developer to provide a way to map one version of a type to a different version of a type .

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You are the domain administrator for the Baldwin Museum of Science. The museum has 50 computers running Microsoft Windows NT 4 Workstation. A customized software package is installed on the clients that allows users to obtain illustrations and descriptions of the museum s exhibits. The domain s two domain controllers also act as file servers, and they have recently been upgraded to Windows Server 2003. Museum visitors who sign on for this service are given user names and passwords that allow them to log on and use this facility. During a closure period, you upgrade all the clients to Windows XP Professional. Now users report that they cannot use the software. How should you solve the problem with the least administrative effort A. Use the Security Configuration And Analysis snap-in to configure the domain controllers with the Compatible security template. B. Use Microsoft Windows 2003 group policy to configure the client PCs with the Compatible security template. C. Use the Security Configuration And Analysis snap-in to configure the clients with the Compatible security template. D. Put all user accounts into the Power Users group on the client PCs.

Foreign types are those that are not directly available to an application. Java foreign types are those whose class files are not included in the application classpath; .NET foreign types are those contained in assemblies that were not referenced at compilation.

You administer a Windows Server 2003 Active Directory domain. Your manager has become concerned with password authentication security, and she has asked you to ensure that no password policy setting for the domain is any less restrictive than those specified by the account policy settings in the Securedc.inf template. Any setting that is as restrictive, or more restrictive, should be retained. All user accounts in your domain are in either the Accounts organizational unit (OU) or the Sales OU. You use the Security Configuration And Analysis snap-in on a domain controller, and use Securedc.inf to analyze the computer settings. You find the following differences:

Basically, to make this mechanism work, you first define a surrogate type that takes over the actions required to serialize and deserialize an existing type . Then, you register an instance of your surrogate type with the formatter telling the formatter which existing type your surrogate type is responsible for acting on . When the formatter detects that it is trying to serialize or deserialize an instance of the existing type, it will call methods defined by your surrogate object . Let s build a sample that demonstrates how all this works . A serialization surrogate type must implement the System.Runtime.Serialization. ISerializationSurrogate interface, which is defined in the FCL as follows:

Policy Enforce Password History Maximum Password Age Store Password Using Reversible Encryption Database 24 passwords remembered 42 days Disabled Computer 6 passwords remembered 100 days Enabled

public interface ISerializationSurrogate { void GetObjectData(Object obj, SerializationInfo info, StreamingContext context); Object SetObjectData(Object obj, SerializationInfo info, StreamingContext context, ISurrogateSelector selector); }

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The Java java.lang.Class class includes an overloaded form of the forName method, which accepts a java.lang.ClassLoader as an argument. The .NET Framework makes similar functionality available through the System.Reflection.Assembly class. The Assembly class defines several static methods that can be used to obtain Assembly instances, as detailed in Table 12-2.

Now, let s walk through an example that uses this interface . Let s say your program contains some DateTime objects that contain values that are local to the user s computer . What if you want to serialize the DateTime objects to a stream but you want the values to be serialized in universal time This would allow you to send the data over a network stream to another machine in another part of the world and have the DateTime value be correct . While you can t modify the DateTime type that ships with the FCL, you can define your own serialization surrogate class that can control how DateTime objects are serialized and deserialized . Here is how to define the surrogate class: