create 2d barcode vb.net // The destructor in C#.NET

Painting Data Matrix in C#.NET // The destructor

// The destructor
Data Matrix ECC200 Generator In C#.NET
Using Barcode generation for Visual Studio .NET Control to generate, create Data Matrix ECC200 image in Visual Studio .NET applications.
www.OnBarcode.com
Data Matrix Scanner In C#.NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Some important guidelines for using destructors are the following: Don t implement a destructor if you don t need one. They can incur performance costs. A destructor should only release external resources that the object owns. It should not access other objects because you can t assume that these objects have not already been collected.
European Article Number 13 Drawer In C#
Using Barcode creator for .NET framework Control to generate, create EAN 13 image in .NET framework applications.
www.OnBarcode.com
Barcode Creation In C#.NET
Using Barcode encoder for .NET Control to generate, create Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Note Although there has sometimes been a question as to whether destructors should be called destructors or finalizers, the C# Language Specification, Version 3.0, released at the end of 2007, calls this method a destructor.
Create PDF-417 2d Barcode In C#.NET
Using Barcode generation for VS .NET Control to generate, create PDF417 image in .NET framework applications.
www.OnBarcode.com
Generate USS Code 39 In C#.NET
Using Barcode maker for VS .NET Control to generate, create ANSI/AIM Code 39 image in .NET applications.
www.OnBarcode.com
CHAPTER 6 MORE ABOUT CLASSES
Print 1D Barcode In C#
Using Barcode creation for .NET framework Control to generate, create Linear image in VS .NET applications.
www.OnBarcode.com
Creating Leitcode In C#
Using Barcode maker for Visual Studio .NET Control to generate, create Leitcode image in .NET framework applications.
www.OnBarcode.com
Calling the Destructor
Data Matrix Creation In VB.NET
Using Barcode printer for .NET framework Control to generate, create Data Matrix image in Visual Studio .NET applications.
www.OnBarcode.com
Data Matrix Recognizer In VB.NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Unlike a C++ destructor, a C# destructor is not called immediately when an instance goes out of scope. In fact, there is no way of knowing when the destructor will be called. Furthermore, as previously mentioned, you cannot explicitly call a destructor. If your code needs a destructor, you must provide it for the system, which will call it at some point before the object is removed from the managed heap. If your code contains unmanaged resources that need to be released in a timely manner, you should not leave that for the destructor, since there is no guarantee that the destructor will run any time soon. Instead, you should adopt the standard pattern where your classes implement what is called the IDisposable interface. (I ll cover interfaces in 17.) This consists of encapsulating the cleanup code for these resources in a void, parameterless method, which you should call Dispose. When you re done with the resources and want them released, you need to call Dispose. Notice that it is you who needs to call Dispose not the destructor. The system will not call it for you automatically. Some guidelines for your Dispose method are the following: Implement the code in Dispose in such a way that it is safe for the method to be called more than once. If it has already been called, then on any subsequent invocations it should not raise an exception or do any additional work. (Exceptions are covered in 11.) Write your Dispose method and destructor such that, if for some reason your code doesn t get to call Dispose, your destructor will call it and release the resources. Since Dispose is doing the cleanup rather than the destructor, it should call the GC.SuppressFinalize method, which tells the CLR not to call this object s destructor, because it has already been taken care of. The following code describes the safe disposal process. First, the class needs to declare a Boolean disposed field to keep track of whether the cleanup has occurred or not. This is initialized to false when the object is created. Inside the Dispose method, do the following: Check the flag to see whether the resources have already been released. If not, then do the following: Call the Dispose methods on any managed resources that require it. Release any unmanaged resources held by the object. Now that the disposal has occurred, set the disposed flag to true. Finally, call the garbage collector s SuppressFinalize method to tell the garbage collector not to call the class s destructor.
Encoding GTIN - 13 In None
Using Barcode printer for Microsoft Excel Control to generate, create EAN-13 image in Excel applications.
www.OnBarcode.com
PDF417 Drawer In Java
Using Barcode creation for BIRT Control to generate, create PDF 417 image in BIRT reports applications.
www.OnBarcode.com
CHAPTER 6 MORE ABOUT CLASSES
Create Code 128A In None
Using Barcode maker for Font Control to generate, create Code 128 Code Set C image in Font applications.
www.OnBarcode.com
Generate EAN 13 In Java
Using Barcode creation for Java Control to generate, create EAN / UCC - 13 image in Java applications.
www.OnBarcode.com
The process in the destructor is similar to but shorter than that in the Dispose method. Just check to see whether the object has already been cleaned up, and if not, then release the unmanaged resources. Notice that in this case you do not call the Dispose methods of any managed resources, because the garbage collector might have already deleted those objects. class MyClass { bool disposed = false;
Barcode Reader In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
www.OnBarcode.com
Encoding QR Code JIS X 0510 In None
Using Barcode creation for Software Control to generate, create QR-Code image in Software applications.
www.OnBarcode.com
// Flag indicating disposal status
QR Code 2d Barcode Maker In VS .NET
Using Barcode encoder for Reporting Service Control to generate, create QR Code ISO/IEC18004 image in Reporting Service applications.
www.OnBarcode.com
EAN128 Creation In VS .NET
Using Barcode encoder for ASP.NET Control to generate, create EAN / UCC - 14 image in ASP.NET applications.
www.OnBarcode.com
//////////////////////////////////////////////////////// public void Dispose() // Public Dispose { if (disposed == false) // Check the flag. { // Call Dispose on managed resources. ... // Release any unmanaged resources. ... } disposed = true; GC.SuppressFinalize(this); } //////////////////////////////////////////////////////// ~MyClass() // Destructor { if (disposed == false) // Check the flag. { // Release any unmanaged resources. ... } } ... } // Set the flag to show disposal. // Tell GC not to call Finalize.
Barcode Maker In None
Using Barcode generator for Online Control to generate, create Barcode image in Online applications.
www.OnBarcode.com
GTIN - 12 Scanner In Visual Basic .NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.