Building the Business Logic Layer in .NET framework

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Building the Business Logic Layer
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Documenting the Class
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It is always a good idea to add documentation for a class immediately after adding the class By adding the documentation right away, you focus on the class s purpose, which helps you keep the class encapsulated It is also much easier to document each class as you go along instead of facing the large task of going back later and documenting all the classes To document the class: 1 Open the class in the Code Editor 2 Move the insertion point immediately before the word Public in the Public Class statement 3 Type three comment markers, de ned in Visual Basic as apostrophes ('''), and press the Enter key The XML comments feature automatically creates the structure of your class documentation as follows:
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''' <summary> ''' ''' </summary> ''' <remarks></remarks> Public Class Product End Class
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NOTE: If you type the three comment markers in the empty line above the class definition instead of on the same line as the class definition, you don t need to press the Enter key to generate the documentation structure
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4 Type a summary of the class s purpose between the summary tags and any remarks between the remark tags Your documentation may be similar to this:
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''' ''' ''' ''' ''' ''' <summary> Provides product management features such as retrieving product data and saving product changes </summary> <remarks>Use this class to work with products </remarks>
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Use the summary tags to describe the class and the remarks tags to add supplemental information The summary is the most important tag because it is the one used by Visual Studio When you provide a summary of the class using XML comments, your class displays documentation about itself in appropriate places within Visual Studio, such as in the List Members box, shown in Figure 51 Open the List Members box by typing a part of the class name in the Code Editor and pressing Ctrl+Spacebar or by selecting Edit | Intellisense | List Members from the main menu bar or by clicking the Display an Object Member List icon on the Text Editor toolbar
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5 BUILDING THE BUSINESS LOGIC LAYER
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Figure 51 The documentation provided in the List Members box is the summary de ned in the XML documentation for the class Using XML comments to document your classes makes it easier for you and other developers to work with your classes
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For the Purchase Tracker sample application: Open the Product class in the Code Editor Add documentation for the Product class using XML comments In the Code Editor, view the comments by typing pro and then pressing Ctrl+Spacebar to display the List Members box, as shown in Figure 51
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Organizing the Code Structure
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Code that is organized is much easier to maintain, because you can quickly nd the code that needs to be changed When you standardize this organizational structure, any member of the team can quickly locate and modify any class code, because the code structure of each class is the same
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A class is normally composed of a set of properties and public and private methods Public methods are methods that can be called from outside of the class, and private methods are those used only within the class You de ne the organizational structure of a class using regions, as described in 3 If you built a class template using the information in 3 and then used that template when creating your class, these regions are already de ned in your code If not, you can create the regions as follows:
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Public Class Product #Region " Properties" #End Region #Region " Public Methods" #End Region #Region " Private Methods" #End Region End Class
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Add any other regions as needed to de ne the standard code structure for your classes For example, if your class has a constructor, you can add a Constructor region as de ned later in this section
NOTE: Once you define the standard set of regions to use in your classes, define a custom class template, as described in 3 Provide this template to all the members of your team This ensures that all the classes of your application follow your standard structure
As you develop the code for the application, properties are added to the Properties region, public methods are added to the Public Methods region, and so on To further aid in the organization, you can insert the properties and methods within each region in alphabetical order