Designing Software in .NET

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Designing Software
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you move code into the framework And if you are working in a team, you need to keep everyone apprised of every change to the framework for the framework to be truly bene cial This book takes the approach of building the application framework as you need it This works well in this case because it provides a logical order to describe the concepts included in that portion of the framework Figure 25 shows the classes in the application framework built in this book and used by the Purchase Tracker application
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Base Form Class
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Figure 25 An application framework provides standard, reusable code in each layer of your architecture The application framework classes that support the presentation layer are built in 4 They include the following:
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The MDI parent form is a standard Multiple Document Interface (MDI) parent form that is part of the NET Framework, tailored to the speci c needs of a basic data management application such as the Purchase Tracker application The IMDIChild interface ensures that all the MDI child forms implement a standard set of methods for performing create and save operations The base form class contains the common user interface code that is needed by all forms
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Implementation-Centered Design
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The business logic layer classes of the application framework are built in 5 They include the following:
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The TypeList class supports types used in drop-down lists, such as customer types and product types The Validation class contains general validation logic, such as required eld checking and string length checking The BOBase class is the base class for all the business objects It tracks record status (insert, update, delete) and validation summary information
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The data access layer of the application framework contains one class, a data access class (DAC) This class, which is built in 8, includes all the code needed to perform queries for retrieving and saving data By using an application framework such as this, you won t need to write code for any of these features again And if you build your own framework, you can add to it as you nd other reusable code See the Additional Reading section for more information on building frameworks
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2 DESIGNING SOFTWARE
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Defining Implementation Requirements
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In addition to the application requirements you de ned during the earlier design phases, consider implementation requirements These are requirements that the user may take for granted, such as security and quality, or that affect the development team, such as exibility and maintenance The most common implementation requirements include the following:
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Security: How will the application data be secured How will the application itself be secured How will the application code be secured Concurrency: How will the system handle multiple users Where are transactions required Performance: What are the performance requirements for the application Where is that performance most critical Application startup Displaying each dialog Does some of the data need to be cached for performance
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Designing Software
Flexibility: Which features will require frequent changes How can you implement those features to minimize the work to support those changes For example, a tax application requires new tax calculations each year, so design it in a way that can easily be changed Scalability: How many users does the application need to support Will that number grow over time Quality: What quality standards are required for the application Other systems: Will other systems need to communicate with this system If so, how will that communication be accomplished Web services Files Support: What tools will be provided to assist with application support Should there be a logging feature for the application to report its problems Physical implementation: Where will the application reside All on the user s system Will there be a database server An application server Deployment: How will the application be deployed Is an XCopy deployment required
Consider these common requirements and include any applicable items in the requirements for your application Keep these requirements in mind as you nish the design process and move into the development phase