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hapter 6 introduced the idea of the PropertyInfo(Of T) class from the Csla namespace. This type allows a business object to declare metadata about the object s properties, and most importantly, it helps eliminate the use of a String literal to reference the property name throughout the business class. Although a business developer could use standard .NET property declaration syntax, it would require him to invoke the authorization, business, and validation rules; processing; and data binding behaviors of CSLA .NET manually in each property. To simplify the code required to utilize all these behaviors, CSLA .NET supports a coding model that is more abstract, allowing the framework to do much of the work automatically. The syntax is similar to that of a dependency property in WPF or WF, but the implementation behind the scenes is quite different. This chapter will focus on how CSLA .NET manages property metadata and helps a business object manage its property values to simplify and standardize business object code.

WS-Secure Conversation, and WS-Security. In addition, you can reduce code listings (and potential errors) by implementing policy frameworks for the participating services and clients. This chapter does not focus on when particular WS- specifications come into play. Instead, the focus is on understanding the concepts and discussing practical code samples.

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You have quite a few options for declaring a property in a CSLA .NET business object, and I ll walk you through all the details. You can choose to declare your own Private backing fields, or you can allow CSLA .NET to manage the values of your properties. Before getting into those options in detail, I ll briefly walk through one common option so you get a feel for the overall structure. Most properties are declared like this: Private Shared NameProperty As PropertyInfo(Of String) = _ RegisterProperty(New PropertyInfo(Of String)("Name")) Public Property Name() As String Get Return GetProperty(NameProperty) End Get Set(ByVal value As String) SetProperty(NameProperty, value) End Set End Property The RegisterProperty() method registers the property s metadata with CSLA .NET, so the framework is aware of the property. Internally, CSLA .NET maintains a list of all the IPropertyInfo objects for each business object type. These values are Shared, so all instances of the type share one list. The field manager subsystem in the Csla.Core.FieldManager namespace maintains the list of IPropertyInfo objects. I ll discuss the field manager later in the chapter. The GetProperty() and SetProperty() methods help minimize the code you would otherwise have to write to trigger authorization, business, and validation rules; status tracking; and data binding.

You now have a functional SQLite installation on your system. If you have GNU Readline installed on you system, the CLP should be compiled with Readline support. Test it by running it from the command line: root@linux # sqlite3 This will invoke the CLP using an in-memory database. Type .help for a list of shell commands. Type .exit to close the application, or press Ctrl+D.

Looking at BusinessBase in Csla.Core, you can see that GetProperty() has many overloads but ultimately does the following: Protected Function GetProperty(Of P)(_ ByVal propertyInfo As PropertyInfo(Of P), _ ByVal noAccess As Security.NoAccessBehavior) As P Dim result As P = Nothing If CanReadProperty(propertyInfo.Name, noAccess = _ Csla.Security.NoAccessBehavior.ThrowException) Then result = ReadProperty(Of P)(propertyInfo) Else result = propertyInfo.DefaultValue End If Return result End Function

The SQLite CLP is the most common means you can use to work with and manage SQLite databases. It operates the same way on all platforms, so learning how to use it ensures you will always have a common and familiar way to manage your databases. The CLP is really two programs in one. It can be run in shell mode acting as an interactive query processor, or it can run from the command line to perform various administration tasks.

A secure conversation is simply a session between a service and a client, where the exchanged SOAP messages are encrypted and signed using tokens that are generated from an STS provider WSE 30 allows any Web service to act as an STS provider via simple policy configuration settings Consider a Web service that already implements the UsernameForCertificateSecurity turnkey security profile It can be reconfigured to issue security context tokens (SCTs) by setting the attribute establishSecurityContext to true, as shown in Listing 7-6 Listing 7-6 Configuring a Web Service to Issue Security Context Tokens for Secure Conversation <UsernameForCertificateSecurity establishSecurityContext="true" renewExpiredSecurityContext="true" RequireSignatureConfirmation="false" MessageProtectionOrder="SignBeforeEncrypting" RequireDeriveKeys="true" ttlInSecconds="300"> The attribute renewExpiredSecurityContext causes the secure conversation to automatically renew in the event that the session times out (due to the SCT token expiring).

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