CLASS TOOLS AND TECHNIQUES in .NET framework

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6 CLASS TOOLS AND TECHNIQUES
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The Quantity property is implemented as follows:
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Private _Quantity As Integer ''' <summary> ''' Gets or sets the quantity purchased ''' </summary> Public Property Quantity() As Integer Get
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Return _Quantity End Get Private Set(ByVal value As Integer) If _Quantity <> value Then Dim propertyName As String = "Quantity" MeDataStateChanged(EntityStateEnumModified) _Quantity = value End If End Set End Property
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The Create method creates an instance of the Purchase as follows:
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Public Shared Function Create(ByVal purchID As Integer) _ As Purchase Dim purch As Purchase ' Create a new instance purch = New Purchase() ' Populate the object If purchID = 1 Then purchPurchaseDate = #4/4/2006# purchQuantity = 5 End If If purchID = 2 Then purchPurchaseDate = #4/6/2006# purchQuantity = 12 End If ' Reset the entity's state purchDataStateChanged(EntityStateEnumUnchanged) Return purch End Function
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NOTE: The code in the Create method that hard-codes the values is temporary until the data can be retrieved from a database, as described in 8, Building the Data Access Layer
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Implementing Master/Detail Classes
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For the Purchase Tracker sample application: Add a Purchase class to the business object Class Library project (PTBO) You can create this class from Solution Explorer, as shown in the preceding chapter, or from Class Designer, as detailed earlier in this chapter Set the Purchase class to inherit from the base business object class (PTBOBase) You can define the inheritance in the Code Editor, as shown in the preceding chapter, or from Class Designer, as detailed earlier in this chapter Add class documentation using XML comments Add properties to the Purchase class for PurchaseDate (Nullable(Of Date)), Quantity (integer), ProductID (integer), and CustomerID (integer) You can type the code for these properties in the Code Editor, as shown in the preceding chapter, or add the properties using Class Designer as shown in this chapter or use a property snippet, as shown in this chapter In any case, be sure to include the code to call DataStateChanged in the PurchaseDate and Quantity properties Add a PurchaseID property to the Purchase class The PurchaseID property in the Purchase class is implemented like the ProductID in the Product class:
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Private _PurchaseID As Integer Public Property PurchaseID() As Integer Get Return _PurchaseID End Get
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6 CLASS TOOLS AND TECHNIQUES
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Private Set(ByVal value As Integer)
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_PurchaseID = value End Set End Property
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Add a Create method to the Purchase class to create an instance of the Purchase class Be sure to add the Shared keyword to the declaration
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In the Create method, set default values for at least two different purchases, as shown in this section Be sure to also add default values for the ProductID and CustomerID properties Modify the Create method to reset the object s entity state back to Unchanged after it sets the property values This ensures that the entity state tracks the user s changes, not changes made to the properties when they are first populated Add documentation for each property and method using XML comments You can define the comments in the Code Editor, as shown in the preceding chapter, or in the Class Details window, as detailed earlier in this chapter Add a private constructor, as shown in the preceding chapter, to ensure that all other code must use the Create method to create an instance of the class You now have the start of a Purchase class If desired, build a unit test for this class to test it
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Building the Detail Collection Class
A collection class is a class that manages a set of objects You can create your collection class in a number of ways, but using one of the built-in generic collection classes provides the greatest bene t A generic collection class is a collection that allows only items of a speci c type to be added to the collection There are a number of builtin generic collection classes Using one of the built-in generic collection classes provides a generalized list that is type-safe and that supports adding only items of a particular type If you want your collection to be bound to user interface elements (which is demonstrated in the next chapter), use the System ComponentModelBindingList generic collection class This makes the collection easy to work with in code and easy to bind to user interface elements such as grids
NOTE: You can use other generic collections, such as List and Dictionary, without inheriting from a NET Framework class See the Additional Reading section for more information on using generics