asp net core 2.1 barcode generator

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As the output confirms, the CountDown class inside Counter is separate from the CountDown class in the Counter2 namespace, and no name conflicts arise Although this example is quite simple, it is easy to see how putting classes into a namespace helps prevent name conflicts between your code and code written by others

If your program includes frequent references to the members of a namespace, having to specify the namespace each time you need to refer to one quickly becomes tedious The using directive alleviates this problem Throughout this book, you have been using it to bring the C# System namespace into view, so you are already familiar with it As you would expect, using can also be employed to bring namespaces that you create into view There are two forms of the using directive The first is shown here: using name; Here, name specifies the name of the namespace you want to access This is the form of using that you have already seen All of the members defined within the specified namespace are brought into view and can be used without qualification A using directive must be specified at the top of each file, prior to any other declarations, or at the start of a namespace body The following program reworks the counter example to show how you can employ using to bring a namespace that you create into view:

[assembly: AssemblyVersion("2.2")]

// Demonstrate the using directive using System;

[assembly: AssemblyTitle("MyPhotos")] [assembly: AssemblyDescription("Sample application for Windows Forms Programming with C#")] [assembly: AssemblyConfiguration("")] [assembly: AssemblyCompany("Manning Publications Co.")] [assembly: AssemblyProduct("MyPhotos")] [assembly: AssemblyCopyright("Copyright (C) 2001")] [assembly: AssemblyTrademark("")] [assembly: AssemblyCulture("")]

Part I:

// Bring Counter into view using Counter; // Declare a namespace for counters namespace Counter { // A simple countdown counter class CountDown { int val; public CountDown(int n) { val = n; } public void Reset(int n) { val = n; } public int Count() { if(val > 0) return val--; else return 0; } } } class NSDemo3 { static void Main() { // now, CountDown can be used directly CountDown cd1 = new CountDown(10); int i; do { i = cd1Count(); ConsoleWrite(i + " "); } while(i > 0); ConsoleWriteLine(); CountDown cd2 = new CountDown(20); do { i = cd2Count(); ConsoleWrite(i + " "); } while(i > 0); ConsoleWriteLine(); cd2Reset(4); do { i = cd2Count(); ConsoleWrite(i + " "); } while(i > 0); ConsoleWriteLine(); } }

SET THE VERSION NUMBER FOR THE MYPHOTOS PROJECT (continued) Action 5 Locate the Form1 constructor. At the end of the constructor, add code to include the version number in the title bar.

This version of the program contains two important changes The first is this using statement, near the top of the program:

} public Form1 { . . . // Set the application title bar Version ver = new Version(Application.ProductVersion); this.Text = String.Format("MyPhotos {0:#}.{1:#}", ver.Major, ver.Minor);

16:

using Counter;

The concept of object inheritance is often explained with the canonical Employee class derived from a Person class. The derived class, in this case Employee, inherits the properties and functionality found in the parent class, e.g., Person. For example, the Person class might provide properties and methods for tracking the address of a person. The Employee class inherits these members and supports this functionality without the addition of any new code.2 The .NET Framework allows a similar behavior for Forms. You can create a form, and then reuse that form in the creation of additional forms. The parent form defines various members and controls that child forms will inherit. Controls on the form define their access level, such as private, protected, or public, just like members of any other class. A child form can modify these controls to the extent of their assigned access level. For our application, we would like to add the two dialogs shown in figure 9.1. The first is for editing the properties of a specific photograph, and the second for editing the properties of an album. While the contents of these two windows are entirely different, they are both modal dialog boxes and share a common set of buttons at the base of the form and a panel at the top.

This brings the Counter namespace into view The second change is that it is no longer necessary to qualify CountDown with Counter, as this statement in Main( ) shows: