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Visual Basic Destructor
Visual Basic Destructor
In visual basic, Destructor is a special method of a class and it is useful in class to destroy the object or instances of classes. The destructor in visual basic will invoke automatically whenever the class instances become unreachable.
The following are the properties of destructor in a visual basic programming language.
- In visual basic, destructors can be used only in classes and a class can contain only one destructor.
- The destructor in class can be represented by using Finalize() method.
- The destructor in visual basic won’t accept any parameters and access modifiers.
- The destructor will invoke automatically, whenever an instance of a class is no longer needed.
- The destructor automatically invoked by garbage collector whenever the class objects that are no longer needed in an application.
Visual Basic Destructor Syntax
Following is the syntax of defining the destructor in visual basic programming language.
Class User
' Destructor
Protected Overrides Sub Finalize()
' Your Code
End Sub
End Class
If you observe the above syntax, we created a destructor using Finalize() method.
Visual Basic Destructor Example
Following is the example of using destructor in a visual basic programming language to destruct the unused objects of the class.
Module Module1
Class User
Public Sub New()
Console.WriteLine("An Instance of class created")
End Sub
Protected Overrides Sub Finalize()
Console.WriteLine("An Instance of class destroyed")
End Sub
End Class
Sub Main()
Details()
GC.Collect()
Console.ReadLine()
End Sub
Public Sub Details()
Dim user As User = New User()
End Sub
End Module
If you observe the above example, we created a class with default constructor and destructor. Here, we created an instance of class “User” in Details() method and whenever the Details function execution is done, then the garbage collector (GC) automatically will invoke the destructor in User class to clear the object of class.
When we execute the above visual basic program, we will get the result like as shown below.
This is how we can use the destructor in visual basic programming language to clear or destruct the unused objects based on our requirements.
