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Obviously, people can resist this trend and make UI-focused design work, but it takes a great deal of discipline. The reality is that a lot of great applications end up crippled because this technique is used.
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Another drawback to starting with the UI is that users often see the mocked-up UI in a demonstration and assume that the application is virtually complete. They don t realize that the bulk of the work comes from the business and data access logic that must still be created and tested behind the UI. The result is that developers are faced with tremendous and unrealistic time pressure to deliver on the application, since from the user s perspective, it s virtually complete already. The third option is to focus on business concepts and process flow. This is the middle road in many ways, since it requires an understanding of how the users will interact with the system, the processes that the system must support, and (by extension) the data that must flow through the system to make it all happen. The benefit of this approach is that it s very business focused, allowing both the analyst and the end users to talk the language of business, thereby avoiding computer concepts and terminology. It also lends itself to the creation of object-oriented designs, because the entities and concepts developed during analysis typically turn into objects within the application. The drawback to this approach is that it doesn t provide users with the look and feel of the UI or the graphical reinforcement of how the system will actually work from their perspective, nor does it produce a clear database design. It leaves the database analyst to do more work in order to design the database. Personally, I use a blend of the business concept and UI approaches. I place the strongest emphasis on the business concept and process flow, while providing key portions of the UI via a prototype, so that the user can get the feel of the system. Since end users have such a hard time relating to database diagrams, I almost never use data-focused analysis techniques, instead leaving the database design process to flow from the other analysis techniques. In this chapter, I ll make use of the business concept and process-flow techniques. It s difficult to storyboard the application at this stage, because we ll be developing both WPF and Web Forms user interfaces, along with a WCF service application interface. The starting point, then, is to create a set of use case descriptions based on how the users (or other applications) will interact with the system.
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Let s create a set of imaginary use cases for the project-tracking system. In a real application, you would develop these by interviewing key users and other interested parties. The use cases here are for illustration purposes.
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Note This application is relatively simple. A real project-tracking system would undoubtedly be more complex, but it is necessary to have something small enough to implement within the context of this book. Remember that my focus is on illustrating how to use CSLA .NET to create business objects, child objects, and so forth.
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Though not mentioned specifically in the following use cases, I m designing this system to accommodate large numbers of users. In 19, for instance, the WPF UI will use the mobile object features of CSLA .NET to run the application in a physical n-tier deployment with an application server. This physical architecture will provide for optimum scalability. In 20, the Web Forms UI will make use of the CSLA .NET framework s ability to run the application s UI, business logic, and data access all on the web server. Again, this provides the highest scaling and best-performing configuration, because you can easily add more web servers as needed to support more users.
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