What Are Destructors?

In this blog, we will understand the definition of a destructor.

Introduction

 

C# is a garbage collector, meaning that the framework will free an object that you no longer need to use. There may be times where you need to do some manual cleanup. A destructor is a method that's called once an object is disposed of, and can be used to clean up resources used by the object.

• Destructors cannot be defined in structs. They are only used with classes.
• A class can only have one destructor.
• Destructors cannot be inherited or overloaded.
• Destructors cannot be called. They are invoked automatically.
• A destructor does not take any parameters or have modifiers.
• We can define a destructor using the Tilde symbol(~).

We can declare a destructor in a class by using the below syntax:

class Test {
    ~Test() {
        System.Diagnostics.Trace.WriteLine("Test's Destructor is called...");
    }
}

Difference between Constructor and Destructor

• A Constructor is a special method that is called automatically each time when an object is created.
• Destructors cannot be called. They are invoked automatically.
• The method with the same name as the class name can be called a constructor.
• A destructor is just the opposite of a constructor. since it gets invoked when the object goes out of scope.
• Like a Constructor, we have same name as the class name with a Destructor as well. We mention this same name with the Tilde symbol(~)
• Constructors can accept parameters in method while passing.
• The destructor does not have any modifiers or have parameters.
• We can overload constructors.
• We cannot overload a Destructor nor inherit it.

Below is an example of a Constructor and Destructor:

public class TestDemo {
    public TestDemo() {
            Console.WriteLine("Constructor Called...");
        }

        ~TestDemo() {
            Console.WriteLine("Destructor Called...");
        }
}

public class Demo {
    public static void Main(string[] args) {
        TestDemo objTestDemo = new TestDemo();
    }
}

Output

 

Constructor Called...

Destructor Called... 

 

Conclusion 

 

Here we understand the definition of Destructor as well as the difference between a Constructor and Destructor. I hope this will clear your doubts about destructors. If you have any queries, you can comment and I will answer as soon as possible.