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Maker PDF 417 in Visual C# Part IV

Part IV
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Core Facilities
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Note The BinaryFormatter class has a bug that prevents a surrogate from serializing
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objects with references to each other . To fix this problem, you need to pass a reference to your ISerializationSurrogate object to FormatterServices s static GetSurrogateForCyclicalReference method . This method returns an ISerializationSurrogate object, which you can then pass to the SurrogateSelector s AddSurrogate method . However, when you use the GetSurrogateForCyclicalReference method, your surrogate s SetObjectData method must modify the value inside the object referred to by SetObjectData s obj parameter and ultimately return null or obj to the calling method . The downloadable code that accompanies this book shows how to modify the UniversalToLocalTimeSerializationSurrogate class and the SerializationSurrogateDemo method to support cyclical references .
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Surrogate Selector Chains
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Multiple SurrogateSelector objects can be chained together . For example, you could have a SurrogateSelector that maintains a set of serialization surrogates that are used for serializing types into proxies that get remoted across the wire or between AppDomains . You could also have a separate SurrogateSelector object that contains a set of serialization surrogates that are used to convert Version 1 types into Version 2 types . If you have multiple SurrogateSelector objects that you d like the formatter to use, you must chain them together into a linked list . The SurrogateSelector type implements the ISurrogateSelector interface, which defines three methods . All three of these methods are related to chaining . Here is how the ISurrogateSelector interface is defined:
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public interface ISurrogateSelector { void ChainSelector(ISurrogateSelector selector); ISurrogateSelector GetNextSelector(); ISerializationSurrogate GetSurrogate(Type type, StreamingContext context, out ISurrogateSelector selector); }
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The ChainSelector method inserts an ISurrogateSelector object immediately after the ISurrogateSelector object being operated on ( this object) . The GetNextSelector method returns a reference to the next ISurrogateSelector object in the chain or null if the object being operated on is the end of the chain . The GetSurrogate method looks up a Type/StreamingContext pair in the ISurrogateSelector object identified by this . If the pair cannot be found, then the next ISurrogateSelector object in the chain is accessed, and so on . If a match is found, then GetSurrogate returns the ISerializationSurrogate object that handles the serialization/ deserialization of the type looked up . In addition, GetSurrogate also returns the ISurrogateSelector object that contained the match; this is usually not needed and is ignored . If none of the ISurrogateSelector objects in the chain have a match for the Type/StreamingContext pair, GetSurrogate returns null .
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24 Runtime Serialization
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Note The FCL defines an ISurrogateSelector interface and also defines a
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SurrogateSelector type that implements this interface . However, it is extremely rare that anyone will ever have to define their own type that implements the ISurrogateSelector
interface . The only reason to define your own type that implements this interface is if you need to have more flexibility over mapping one type to another . For example, you might want to serialize all types that inherit from a specific base class in a special way . The System.Runtime.Remoting.Messaging.RemotingSurrogateSelector class is a perfect example . When serializing objects for remoting purposes, the CLR formats the objects using the RemotingSurrogateSelector . This surrogate selector serializes all objects that derive from System.MarshalByRefObject in a special way so that deserialization causes proxy objects to be created on the client side .
Overriding the Assembly and/or Type When Deserializing an Object
When serializing an object, formatters output the type s full name and the full name of the type s defining assembly . When deserializing an object, formatters use this information to know exactly what type of object to construct and initialize . The earlier discussion about the ISerializationSurrogate interface showed a mechanism allowing you to take over the serialization and deserialization duties for a specific type . A type that implements the ISerializationSurrogate interface is tied to a specific type in a specific assembly . However, there are times when the ISerializationSurrogate mechanism doesn t provide enough flexibility . Here are some scenarios when it might be useful to deserialize an object into a different type than it was serialized as:
A developer might decide to move a type s implementation from one assembly to a different assembly . For example, the assembly s version number changes making the new assembly different from the original assembly . An object on a server that gets serialized into a stream that is sent to a client . When the client processes the stream, it could deserialize the object to a completely different type whose code knows how to remote method calls to the server s object . A developer makes a new version of a type . We want to deserialize any already-serialized objects into the new version of the type .
The System.Runtime.Serialization.SerializationBinder class makes deserializing an object to a different type very easy . To do this, you first define your own type that derives from the abstract SerializationBinder type . In the code below, assume that version 1 .0 .0 .0 of your assembly defined a class called Ver1 and assume that the new version of your assembly defines the Ver1ToVer2SerializationBinder class and also defines a class called Ver2:
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