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Serialization in CSLA .NET
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CSLA .NET directly uses the BinaryFormatter in only a few places: when cloning an object graph, in the n-level undo implementation, and in some of the data portal channels. CSLA .NET does support the optional use of DataContract when cloning an object graph and when using n-level undo. To do this, CSLA .NET must use the NDCS instead of the BinaryFormatter to do any explicit serialization.
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Configuring CSLA .NET to Use NetDataContractSerializer
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You must configure CSLA .NET to use NDCS rather than the BinaryFormatter. Because I believe the opt-out model is better for business object development, the default is to use the BinaryFormatter.
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I recommend that you only configure CSLA .NET to use the NDCS if you use the DataContract attribute instead of the Serializable attribute in your business classes.
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To configure CSLA .NET to use the NDCS you must add an element to the appSettings of your app.config or web.config file: < xml version="1.0" encoding="utf-8" > <configuration> <appSettings> <add key="CslaAuthentication" value="Csla" /> <add key="CslaSerializationFormatter" value="NetDataContractSerializer"/> This will cause both the clone and n-level undo implementations in CSLA .NET to use NDCS. The result is that you can use the DataContract attribute instead of or in combination with the Serializable attribute in your business classes.
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CHAPTER 4 CSLA . NET OBJECT STEREOTYPES
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Note that only the WCF data portal channel uses the NDCS, so if you use the DataContract attribute in your business objects you cannot use any of the older data portal channels.
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If you are using the DataContract and DataMember attributes in your business classes, you can only use the local or WCF data portal channels. The Remoting, Web Services, and Enterprise Services channels will all throw serialization exceptions if you attempt to use them.
The important thing to remember is that all business classes must use Serializable or DataContract to work with CSLA .NET. Throughout the rest of the book I assume the use of the Serializable attribute.
Common Regions
When writing code in VS .NET, the #region directive can be used to place code into collapsible regions. This helps organize the code and allows you to look only at the code pertaining to a specific type of functionality. All business collection classes have a common set of regions, as follows: Factory Methods Data Access And so classes derived from BusinessListBase and ReadOnlyListBase follow this basic structure: [Serializable] public class MyCollectionClass : Csla.baseclass<MyCollectionClass, MyChildType> { #region Factory Methods #endregion #region Data Access #endregion } The one exception to this is when you use the ObjectFactory attribute on the business class, in which case there would be no Data Access region because that code would be in a separate object factory class. All noncollection (editable and read-only) classes have the following set of regions: Business Methods Business and Validation Rules Authorization Rules Factory Methods Data Access This means that the skeletal structure of a business object, with these regions, is as follows:
CH A PT ER 4 C SLA .NET O BJECT S TER EOT YPES
[Serializable] public class MyBusinessClass : Csla.baseclass<MyBusinessClass> { #region Business Methods #endregion #region Business and Validation Rules #endregion #region Authorization Rules #endregion #region Factory Methods #endregion #region Data Access #endregion } The one exception to this is when you use the ObjectFactory attribute on the business class, in which case there would be no Data Access region because that code would be in a separate object factory class. Command objects that inherit from CommandBase have the following regions: Authorization Rules Factory Methods Client-side Code Server-side Code [Serializable] public class MyCommandClass : Csla.CommandBase { #region Authorization Rules #endregion #region Factory Methods #endregion #region Client-side Code #endregion #region Server-side Code #endregion }
CHAPTER 4 CSLA . NET OBJECT STEREOTYPES
The one exception to this is when you use the ObjectFactory attribute on the business class, in which case there would be no Server-side Code region because that code would be in the update method of a separate object factory class. Name/value list objects that inherit from NameValueListBase will typically have the following regions: Factory Methods Data Access [Serializable] public class MyListClass : Csla.NameValueListBase<KeyType, ValueType> { #region Factory Methods #endregion #region Data Access #endregion } The one exception to this is when you use the ObjectFactory attribute on the business class, in which case there would be no Data Access region because that code would be in a separate object factory class. And objects that inherit from EditableRootListBase will typically have the following regions: Factory Methods Data Access [Serializable] public class MyListClass : Csla.EditableRootListBase<MyRootType> { #region Factory Methods #endregion #region Data Access #endregion } Again, the one exception is when you use the ObjectFactory attribute on the business class; there would be no Data Access region in this case either. The Business Methods region contains the methods that are used by UI code (or other client code) to interact with the business object. This includes any properties that allow retrieval or changing of values in the object as well as methods that operate on the object s data to perform business processing. The Business Rules region contains the AddBusinessRules() method and any custom validation or business rule methods required by the object. The Authorization Rules region contains the AddAuthorizationRules() and AddObjectAuthorizationRules() methods. The Factory Methods region contains the static factory methods to create or retrieve the object, along with the static delete method (if the object is an editable root object). It also contains the default constructor for the class, which must be scoped as non-public (i.e., private or protected) to force the use of the factory methods when creating the business object.
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