Calls to the CalculateAverage function now accept any number of decimal values. in VB.NET

Creator QR Code JIS X 0510 in VB.NET Calls to the CalculateAverage function now accept any number of decimal values.

Calls to the CalculateAverage function now accept any number of decimal values.
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MsgBox(CalculateAverage(1, 2, 3, 4, 5)) ' Displays: 3
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The ability to extend classes through inheritance is truly the foundation on which complex yet manageable programs are built in .NET. And they are not overly complex, either. Classes are simple containers for their members, and the variety and complexity of the available members are not that great. So, it s really amazing that you can write almost any type of program, and implement any number of features, using these simple foundational tools. Oh yeah, the Visual Basic language helps, too. As we add code to the Library Project throughout this book, you will become more and more familiar with classes, structures, modules, and their members. And although you ll never remember whether ByRef or ByVal is the default parameterpassing mechanism for methods, you will add properties, methods, events, fields, and other types to classes like you were born with the ability.
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This chapter s code implements two features of the Library Project: (1) a simple helper class used with ListBox and ComboBox controls to manage text and data; and (2) a set of generic forms used to edit lookup tables in the Library, such as tables of status codes.
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Supporting List and Combo Boxes
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In Visual Basic 6.0 and earlier, ListBox and ComboBox controls included two primary array-like collections: List (used to store the display text for each item) and ItemData (used to store a 32-bit numeric value for each item). The List array was important to the user since it presented the text for each item. But many programmers depended more on the ItemData array, which allowed a unique identifier to be attached to each list item.
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cboMonth.AddItem "January" cboMonth.ItemData(cboMonth.NewIndex) = 1 cboMonth.AddItem "February" cboMonth.ItemData(cboMonth.NewIndex) = 2 ... cboMonth.AddItem "December" cboMonth.ItemData(cboMonth.NewIndex) = 12
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Later, after the user selected a value from the list, the numeric ID could be used for database lookup or any other designated purpose.
nMonth = cboMonth.ItemData(cboMonth.ListIndex)
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8: Classes and Inheritance
The bad news is that neither List nor ItemData exists in the .NET variation of ListBox or ComboBox controls. The good news is that both are replaced with a much more flexible collection: Items. The Items collection stores any type of object you want: instances of Integer, String, Date, Animal, or even Superhero, and you can mix them within a single ListBox. Since Items is just a collection of System.Object instances, you can put any type of object you wish in the collection. The ListBox (or ComboBox) uses this collection to display items in the list. So, how does a ListBox control know how to display text for any mixture of objects By default, the control calls the ToString method of the object. ToString is defined in System.Object, and you can override it in your own class. The ListBox control also includes a DisplayMember property that you can set to the field or property of your class that generates the proper text. Let s see a ListBox in action. Add a new ListBox to a form, and then add the following code to the form s Load event handler.
Public Class Form1 Private Sub Form1_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load ListBox1.Items.Add(1) ListBox1.Items.Add("Easy") ListBox1.Items.Add(#5/3/2006#) End Sub End Class
Running this code displays the form in Figure 8-3.
For the old ItemData value, the ListBox control includes a ValueMember property that identifies the identifier field or property for the objects in the Items collection. But you don t have to use ValueMember. Instead, you can simply extract the object in question from the Items collection, and examine its members with your own custom code to determine its identity. In reality, it s a little more work than the old Visual Basic 6.0 method. But then again, since you can store objects of any size in the Items collection, you could opt to store entire database records, something you could never do before .NET.
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