qr code generator with c# Destructors in Visual C#.NET

Making QR-Code in Visual C#.NET Destructors

Destructors
Generate QR-Code In Visual C#.NET
Using Barcode generation for VS .NET Control to generate, create QR Code 2d barcode image in .NET applications.
QR Code Scanner In C#.NET
Using Barcode scanner for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
It is possible to define a method that will be called just prior to an object s final destruction by the garbage collector This method is called a destructor, and it can be used in some highly specialized situations to ensure that an object terminates cleanly For example, you might use a destructor to ensure that a system resource owned by an object is released It must be stated at the outset that destructors are a very advanced feature that are applicable only to certain rare cases They are not normally needed They are briefly described here for completeness Destructors have this general form: ~class-name( ) { // destruction code }
Barcode Creation In C#.NET
Using Barcode creation for Visual Studio .NET Control to generate, create barcode image in .NET applications.
Bar Code Reader In C#.NET
Using Barcode reader for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
Part I:
QR-Code Generator In Visual Studio .NET
Using Barcode creator for ASP.NET Control to generate, create QR image in ASP.NET applications.
QR Code JIS X 0510 Generator In VS .NET
Using Barcode generator for .NET Control to generate, create QR image in VS .NET applications.
The C# Language
QR Code Creator In VB.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create QR image in VS .NET applications.
Making USS Code 128 In C#
Using Barcode creator for .NET framework Control to generate, create Code-128 image in Visual Studio .NET applications.
Here, class-name is the name of the class Thus, a destructor is declared like a constructor except that it is preceded with a ~ (tilde) Notice it has no return type and takes no arguments To add a destructor to a class, you simply include it as a member It is called whenever an object of its class is about to be recycled Inside the destructor, you will specify those actions that must be performed before an object is destroyed It is important to understand that the destructor is called just prior to garbage collection It is not called when a variable containing a reference to an object goes out of scope, for example (This differs from destructors in C++, which are called when an object goes out of scope) This means that you cannot know precisely when a destructor will be executed Furthermore, it is possible for your program to end before garbage collection occurs, so a destructor might not get called at all The following program demonstrates a destructor It works by creating and destroying a large number of objects During this process, at some point the garbage collector will be activated, and the destructors for the objects will be called
Print Code-39 In C#
Using Barcode generator for Visual Studio .NET Control to generate, create Code 39 Full ASCII image in .NET applications.
Generate UCC - 12 In C#
Using Barcode encoder for Visual Studio .NET Control to generate, create GS1-128 image in Visual Studio .NET applications.
// Demonstrate a destructor using System; class Destruct { public int x; public Destruct(int i) { x = i; } // Called when object is recycled ~Destruct() { ConsoleWriteLine("Destructing " + x); } // Generates an object that is immediately destroyed public void Generator(int i) { Destruct o = new Destruct(i); } } class DestructDemo { static void Main() { int count; Destruct ob = new Destruct(0); /* Now, generate a large number of objects At some point, garbage collection will occur Note: You might need to increase the number of objects generated in order to force garbage collection */ for(count=1; count < 100000; count++)
Barcode Generation In Visual C#.NET
Using Barcode generation for Visual Studio .NET Control to generate, create bar code image in .NET applications.
Painting Bookland EAN In Visual C#.NET
Using Barcode creation for Visual Studio .NET Control to generate, create ISBN - 10 image in .NET applications.
6:
ECC200 Decoder In Visual Studio .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
Bar Code Reader In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
Introducing Classes and Objects
Bar Code Scanner In .NET Framework
Using Barcode scanner for VS .NET Control to read, scan read, scan image in VS .NET applications.
Barcode Reader In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
obGenerator(count); ConsoleWriteLine("Done");
UPC Code Maker In Java
Using Barcode maker for Java Control to generate, create UPC-A image in Java applications.
GS1 DataBar Limited Creation In VS .NET
Using Barcode maker for VS .NET Control to generate, create GS1 DataBar Limited image in .NET applications.
PART I PART I PART I
Paint EAN 13 In Visual Basic .NET
Using Barcode printer for Visual Studio .NET Control to generate, create GS1 - 13 image in .NET applications.
USS-128 Printer In .NET Framework
Using Barcode maker for ASP.NET Control to generate, create UCC.EAN - 128 image in ASP.NET applications.
Here is how the program works The constructor sets the instance variable x to a known value In this example, x is used as an object ID The destructor displays the value of x when an object is recycled Of special interest is Generator( ) This method creates and then promptly destroys a Destruct object The DestructDemo class creates an initial Destruct object called ob Then using ob, it creates 100,000 objects by calling Generator( ) on ob This has the net effect of creating and destroying 100,000 objects At various points in the middle of this process, garbage collection will take place Precisely how often or when is dependent upon several factors, such as the initial amount of free memory, the operating system, and so on However, at some point, you will start to see the messages generated by the destructor If you don t see the messages prior to program termination (that is, before you see the Done message), try increasing the number of objects being generated by upping the count in the for loop One important point: The call to WriteLine( ) inside ~Destruct( ) is purely for the sake of illustration in this rather contrived example Normally, a destructor should act only on the instance variables defined by its class Because of the nondeterministic way in which destructors are called, they should not be used to perform actions that must occur at a specific point in your program One other point: It is possible to request garbage collection This is described in Part II, when C# s class library is discussed However, manually initiating garbage collection is not recommended for most circumstances, because it can lead to inefficiencies Also, because of the way the garbage collector works, even if you explicitly request garbage collection, there is no way to know precisely when a specific object will be recycled
Copyright © OnBarcode.com . All rights reserved.