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In 3, Fields and Properties, you ll see how we can replace the GetPage method with a construct known as an indexer in Visual C# or with a default Item method in Visual Basic. The complete class definitions for our project are shown here: Visual Basic Public Class Book Public Text As String = "" Public PageLength As Integer = 10 Private m_title As String Public Property Title() As String Get Return m_title End Get Set(ByVal Value As String) m_title = Value End Set End Property Public Function GetPage(ByVal pageNumber As Integer) As String Dim start As Integer = (pageNumber - 1) * PageLength If (start < Text.Length) And (start >= 0) Then If (start + PageLength) < Text.Length Then Return Text.Substring(start, PageLength) Else Return Text.Substring(start, Text.Length - start) End If Else Return "" End If End FunctionEnd Class // Visual C#using System;namespace ReadBooks{ /// <summary> /// Summary description for Book. /// </summary> public class Book { public string Text = ""; public int PageLength = 10; private string m_title; public Book() { // // TODO: Add constructor logic here // } vb.net qr code scanner ByteScout Barcode Reader SDK - VB . NET - Decode QR Code ...
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See similar post: QR Code Scanner in ASP. Net [^]. Quote: QR Code Library 1.3[^] is a . NET component that can be used to encode and decode ... public string Title { get { return m_title; } set { m_title = value; } } public string GetPage(int pageNumber) { int start = (pageNumber - 1) * PageLength; if ((start < Text.Length) && (start >= 0)) { if ((start + PageLength) < Text.Length) { return Text.Substring(start, PageLength); } else { return Text.Substring(start, Text.Length - start); } } else { return ""; } } }} Fields, properties, methods, and constructors can appear in any order in a class definition. Good organization benefits future readers of your code. Here s a common organization and, in fact, the one I used in this book: Field declarations Constructors Properties Methods Using the Book Class in an Application You ve just finished implementing the Book class. The class definition is just a template for an object. To put data in the fields and properties, you have to create an instance of the class in memory; this action is known as instantiation. When you create an instance, a section of memory is set aside to hold the fields of the object. If you create another instance of the class, another section of memory is set aside for its fields. You aren t going to implement the full solution yet. First you need to write some code to test your class. You ll create two instances of the Book class in the ReadBooks project, and you ll display the fourth page of each book. (These will be very short books.) You ll create a cookbook and a book of fairy tales, so you ll need to create two separate instances of the Book class. Instead of creating a fancy interface, you ll write just enough code to see whether your class is working as you expected. vb.net qr code scanner VB . NET Image: VB . NET QR Code Barcode Reader SDK for .NET ...
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