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Net serialization
This document discusses .NET serialization, including: - Serialization converts objects to bytes for exchange or storage. It is reversible through deserialization. - Common serializers include BinaryFormatter, XMLSerializer, and DataContractSerializer. They serialize type, member, and value information. - Attributes like Serializable control serialization behavior. Custom serialization is possible through interfaces like ISerializable. - Version tolerance allows deserializing objects serialized with previous versions, by ignoring new fields and marking changed ones as optional. Unit tests validate serialization.
Net serialization
- 1. .NET Serialization Understanding andeffectively applying serialization in .NET applications Presented by Gregory M. Sohl
- 2. About Greg Software Architectat StoneRiver President of Iowa Code Camp Co-leader and MC for CRineta Blog: cwi-websoft.com Twitter: @gregsohl
- 3. Agenda What is Serialization Whatis Serialization Used For How Serialization Works Available Serializers Examples of use Attributes Customizing Serialization Versioning Unit Testing
- 4. Serialization Is … Theprocess of converting an object or graph of objects to a sequence of bytes. Serialized data is Self described Reversible - Deserialization
- 5. Uses Exchange .NET objects Two .NET Applications .NET Application Layers – loosely connected Non-.NET applications Storage of .NET object states To file or database
- 6. Available Serializers Serializer SourceFormat BinaryFormatter Framework Binary XMLSerializer Framework XML DataContractSerializer Framework XML NetDataContractSerializer Framework XML DataContractJsonSerializer Framework JSON JSON.NET Open Src JSON CompactFormatter Open Src Binary Protobuf-Net Open Src Binary SoapFormatter Framework XML Many other open source tools Open Src Various
- 7. What Do TheySerialize Generally Type information Member type information Member name information or use sequence Member values XmlSerializer, JSON.NET, DCJS Public fields and property values BinaryFormatter, CompactFormatter, DCJS Fields
- 8. Basic Examples Let’s seea little code…
- 9. How It Works Reflectionto read properties or fields Transformation of known types to byte or character streams Recursion into complex types Detect / prevent loops Varies by implementation Recording of field name Recording of data type Recording of data value
- 10. Controlling Serialization Serializable Applyto Types Indicates a type can be serialized NonSerialized Apply to Properties, Fields Indicates a member should not be serialized … and now some more code
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- 12. We Need MoreControl Attributes OnSerializing, OnSerialized OnDeserializing, OnDeserialized Use with BinaryFormatter WCF serializers JSON.NET
- 13. Help for XMLSerializer XmlInclude Attribute Includes definition of additional types Needed for types not directly specified
- 14. Customizing Serialization Ultimate Control ISerializable Deserialization constructor GetObjectData method IXmlSerializable ReadXml WriteXml GetSchema – Nop – just return null
- 15. Versioning .NET 2.0 addedversion tolerance to BF Add new fields without breaking deserialization Additional fields in stream ignored during deserialization Attribute fields as OptionalField Set VersionAdded param, though still not implemented
- 16. Version Tolerance Rules Neverremove a serialized field. Never apply the NonSerializedAttribute attribute to a field if the attribute was not applied to the field in the previous version. Never change the name or the type of a serialized field. When adding a new serialized field, apply the OptionalFieldAttribute attribute.
- 17. Version Tolerance Rules Whenremoving a NonSerializedAttribute attribute from a field (that was not serializable in a previous version), apply the OptionalFieldAttribute attribute. For all optional fields, set meaningful defaults using the serialization callbacks unless 0 or nullas defaults are acceptable.
- 18. Versioning Other changes andother serializers require custom serialization Member data type changes Semantic changes
- 19. Unit Testing Now thatyou have all this code… Make sure various data types serialize/deserialize Custom serialization needs testing! Easy to mess up Easy to break
- 20.