.net core qr code Business Framework Implementation in Visual Basic .NET

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n 1, I discussed the concepts behind the use of business objects and distributed objects. In 2, I explored the design of the business framework. s 3 through 5 covered objectoriented design in general and then focused more around the specific stereotypes directly supported by CSLA .NET. In this chapter, I start walking through the implementation of the CSLA .NET framework by providing an overview of the namespaces and project structure of the framework. Then in s 7 through 16, I provide detail about the implementation of each of the major features of the framework as discussed in 2. The focus in this chapter is on the overall project structure and namespaces used to organize all the framework code and a walkthrough of the structure of the major types in the Csla and Csla.Core namespaces. CSLA .NET has existed since around the year 2001 and has been steadily evolving since then, based on feedback from the user community and to keep up with the many changes Microsoft has made to the Microsoft .NET Framework. The result is that CSLA .NET is now a large and complex framework. My goal, however, is to take complexity out of the application and place it into CSLA .NET so developers who use the framework don t need to deal with the complexity. In other words, CSLA .NET solves some pretty complicated issues and tries to expose its solutions in an easy-to-use manner. As discussed in s 4 and 5, business developers primarily interact with a limited set of base classes provided by CSLA .NET: Csla.BusinessBase(Of T) Csla.BusinessListBase(Of T, C) Csla.ReadOnlyBase(Of T) Csla.ReadOnlyListBase(Of T, C) Csla.NameValueListBase(Of K, V) Csla.CommandBase Csla.EditableRootListBase(Of T) Csla.CriteriaBase These base classes are the primary classes from which most business objects inherit. Almost all the other classes in CSLA .NET exist to support the functionality provided by these base classes. In particular, BusinessBase(Of T) relies on quite a number of other classes. For instance, Csla.BusinessBase(Of T) inherits from Csla.Core.BusinessBase, which inherits from Csla.Core.UndoableBase. It also makes use of the ValidationRules and AuthorizationRules classes, among others. I ll start by describing the overall structure of the Csla project and then discuss each of the namespaces and the functionality each contains, with some extra emphasis on the Csla and Csla.Core namespaces. Most of the namespaces contain implementations of major CSLA .NET features that are covered in detail in subsequent chapters.
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CHAPTER 6 BUS INE SS FRA MEWORK I MPLEME NTA T ION
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Obviously, there is a lot to cover, and this book will include only the critical code from each class. You ll want to download the code for the book from the Source Code section of the Apress website (www.apress.com) or www.lhotka.net/cslanet/download.aspx so you can see each complete class or type as it is discussed.
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CSLA .NET Project Structure
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The current version of CSLA .NET requires the use of Visual Studio 2008 and the Microsoft .NET Framework version 3.5 SP1. Earlier versions of CSLA .NET exist that support Microsoft .NET 1.0 through 3.0 and are also available from the download website. CSLA .NET is implemented as a Class Library project named Csla. This means it builds as a DLL, which can be referenced by your business application projects.
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Project Directory Structure
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To keep all the source files in the project orderly, the project s code is organized into a set of folders. Table 6-1 lists the folders in the project. Table 6-1. Folders in the CSLA Project
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Folder
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\ \Core \Data \DataPortalClient \Linq \Reflection \Security \Serialization \Server \Silverlight \Validation \Web \Windows \Workflow \Wpf
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Purpose
These are the types most commonly used by developers as they build business objects based on CSLA .NET. These types are used by other framework classes and often extend the .NET Framework or enable extension of CSLA .NET. These types provide functionality to simplify writing data access code. These types are part of the data portal functionality (see 15). These types are required by the LINQ to CSLA functionality. These are a set of helper types that abstract the use of reflection. These are the types that implement authorization and help implement custom authentication. These are a set of helper types that abstract the serialization of objects. These types implement the server-side data portal functionality (see 15). These types enable interaction with CSLA .NET for Silverlight. These are the types that implement the business and validation rules support for editable business objects. These are types and controls used to assist in the creation of Web Forms user interfaces. These are types and controls used to assist in the creation of Windows Forms user interfaces. These are types used to assist in the creation of Windows Workflow Foundation workflows. These contain types and controls used to assist in the creation of WPF user interfaces.
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