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Controlling the Serialized/Deserialized Data
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As discussed earlier in this chapter, the best way to get control over the serialization and deserialization process is to use the OnSerializing, OnSerialized, OnDeserializing, OnDeserialized, NonSerialized, and OptionalField attributes . However, there are some very rare scenarios where these attributes do not give you all the control you need . In addition, the formatters use reflection internally and reflection is slow, which increases the time it takes to serialize and deserialize objects . To get complete control over what data is serialized/deserialized or to eliminate the use of reflection, your type can implement the System.Runtime.Serialization.ISerializable interface, which is defined as follows:
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public interface ISerializable { void GetObjectData(SerializationInfo info, StreamingContext context); }
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This interface has just one method in it, GetObjectData . But most types that implement this interface will also implement a special constructor that I ll describe shortly . Important The big problem with the ISerializable interface is that once a type implements
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it, all derived types must implement it too, and the derived types must make sure that they invoke the base class s GetObjectData method and the special constructor . In addition, once a type implements this interface, it can never remove it because it will lose compatibility with the derived types . It is always OK for sealed types to implement the ISerializable interface . Using the custom attributes described earlier in this chapter avoids all of the potential problems associated with the ISerializable interface .
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Important The ISerializable interface and the special constructor are intended to be
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used by the formatters . However, other code could call GetObjectData, which might then return potentially sensitive information, or other code could construct an object that passes in corrupt data . For this reason, it is recommended that you apply the following attribute to the GetObjectData method and the special constructor:
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[SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter = true)]
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When a formatter serializes an object graph, it looks at each object . If its type implements the ISerializable interface, then the formatter ignores all custom attributes and instead constructs a new System.Runtime.Serialization.SerializationInfo object . This object contains the actual set of values that should be serialized for the object . When constructing a SerializationInfo, the formatter passes two parameters: Type and System.Runtime.Serialization.IFormatterConverter. The Type parameter identifies the object that is being serialized . Two pieces of information are required to uniquely identify a type: the string name of the type and its assembly s identity (which includes the assembly name, version, culture, and public key) . When a SerializationInfo object is constructed, it obtains the type s full name (by internally querying Type s FullName property) and stores this string in a private field . You can obtain the type s full name by querying SerializationInfo s FullTypeName property . Likewise, the constructor obtains the type s defining assembly (by internally querying Type s Module property followed by querying Module s Assembly property followed by querying Assembly s FullName property) and stores this string in a private field . You can obtain the assembly s identity by querying SerializationInfo s AssemblyName property . Note While you can set a SerializationInfo s FullTypeName and AssemblyName properties,
this is discouraged . If you want to change the type that is being serialized, it is recommended that you call SerializationInfo s SetType method, passing a reference to the desired Type object . Calling SetType ensures that the type s full name and defining assembly are set correctly . An example of calling SetType is shown in the Serializing a Type as a Different Type and Deserializing an Object as a Different Object section later in this chapter .
24 Runtime Serialization
Once the SerializationInfo object is constructed and initialized, the formatter calls the type s GetObjectData method, passing it the reference to the SerializationInfo object . The GetObjectData method is responsible for determining what information is necessary to serialize the object and adding this information to the SerializationInfo object . GetObjectData indicates what information to serialize by calling one of the many overloaded AddValue methods provided by the SerializationInfo type . AddValue is called once for each piece of data that you wish to add . The code below shows how the Dictionary<TKey, TValue> type implements the ISerializable and IDeserializationCallback interfaces to take control over the serialization and deserialization of its objects .
[Serializable] public class Dictionary<TKey, TValue>: ISerializable, IDeserializationCallback { // Private fields go here (not shown) private SerializationInfo m_siInfo; // Only used for deserialization
// Special constructor (required by ISerializable) to control deserialization [SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter = true)] protected Dictionary(SerializationInfo info, StreamingContext context) { // During deserialization, save the SerializationInfo for OnDeserialization m_siInfo = info; } // Method to control serialization [SecurityCritical] public virtual void GetObjectData(SerializationInfo info, StreamingContext context) { info.AddValue("Version", m_version); info.AddValue("Comparer", m_comparer, typeof(IEqualityComparer<TKey>)); info.AddValue("HashSize", (m_ buckets == null) 0 : m_buckets.Length); if (m_buckets != null) { KeyValuePair<TKey, TValue>[] array = new KeyValuePair<TKey, TValue>[Count]; CopyTo(array, 0); info.AddValue("KeyValuePairs", array, typeof(KeyValuePair<TKey, TValue>[])); } } // Method called after all key/value objects have been deserialized public virtual void IDeserializationCallback.OnDeserialization(Object sender) { if (m_siInfo == null) return; // Never set, return Int32 num = m_siInfo.GetInt32("Version"); Int32 num2 = m_siInfo.GetInt32("HashSize"); m_comparer = (IEqualityComparer<TKey>) m_siInfo.GetValue("Comparer", typeof(IEqualityComparer<TKey>)); if (num2 != 0) { m_buckets = new Int32[num2]; for (Int32 i = 0; i < m_buckets.Length; i++) m_buckets[i] = -1; m_entries = new Entry<TKey, TValue>[num2];
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