CourseManagementEntitiesEntity Classes in .NET

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In the following scenarios, you can see how you can define entity classes Figure 15-4 shows the major entity classes of the solution The class Course holds the data of a course; the description of the course is in the class CourseDescription For every date for which a course is planned, the CourseDate class holds relevant data such as the start date of the course, the location, the maximum attendee count (which depends on the room), the number of days, and the price
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Figure 15-4 Entity classes
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The class Person has different roles according to the associations Persons associated with theCourseDate class are attendees of the course With the Company class, a person can be the main contact for the company or just an employee
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Some data is needed for all entity classes The common information is contained in the base class Entity that is shown in Listing 15-1 [2] Common to all entity classes is a GUID, which is used for identification when storing the data in the database, and a timestamp The Entity class has two constructors The constructor is declared with theinternal access modifier and is used when objects are created that are filled with data read from the database; the default constructor with the protected access modifier is used for instantiating new objects that should be written to the database The internal access modifier only allows instantiating objects from within the same assembly This restriction prevents developers from using this constructor unintentionally when writing the client application (which is a different assembly) When storing the entity classes, it proves useful to know whether the data changed, so the Entity class has the properties IsNew and IsModified The isNew field is set to true when a new entity object is created that was not previously stored in the database The isModified field is set to true when an object state that must be stored is changed With the internal constructor, both the isNew and isModified fields are set to false, because the object already exists and is created with data from the database The protected constructor of the Entity class is used to instantiate new objects, so the isNew field is set to true
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Listing 15-1 Entity Class
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using System; namespace CourseManagementEntities { [Serializable] public class Entity { protected Entity() { id = GuidNewGuid(); timestamp = null; isModified = false; isNew = true; } internal Entity(Guid id, byte[] timestamp) { thisid = id; thistimestamp = timestamp; isNew = false; isModified = false; } private readonly Guid id; public Guid Id { get { return id; } }
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private readonly byte[] timestamp; public byte[] Timestamp {
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get { return timestamp; } } protected bool isModified; public bool IsModified { get { return isModified; } } protected bool isNew; public bool IsNew { get { return isNew; } } } }
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The Course class is shown in Listing 15-2 This class derives from the base classEntity Similar to the base class, the constructor with the internal access modifier is used with objects that are created when data is read from the database The method ToString is overridden from the base class Object, because the string that is returned here is used with data binding to get a default representation of the Course objects Data binding is used later with the user interface, to display the string representation of the course in the user dialog boxes The Course class has properties that represent a course: the course number, title, and category Because the company Cool Training offers training with different categories, the property Category helps to map a course to a category Courses are never deleted when they are no longer in use; instead, the course is set to an inactive state, hence the Active property Specific dates of courses can be accessed by using the CourseDates property, which returns an ArrayList collection of CourseDate objects
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