Are C# destructors the same as C++ destructors?
No. They look the same but they are very different. The C# destructor syntax (with the familiar ~ character) is just syntactic sugar for an override of the System.Object Finalize method. This Finalize method is called by the garbage collector when it determines that an object is no longer referenced, before it frees the memory associated with the object. So far this sounds like a C++ destructor. The difference is that the garbage collector makes no guarantees about when this procedure happens. Indeed, the algorithm employed by the CLR garbage collector means that it may be a long time after the application has finished with the object. This lack of certainty is often termed ‘non-deterministic finalization’, and it means that C# destructors are not suitable for releasing scarce resources such as database connections, file handles etc.To achieve deterministic destruction, a class must offer a method to be used for the purpose. The standard approach is for the class to implement the IDisposable interface. The user of the object must call the Dispose() method when it has finished with the object. C# offers the ‘using’ construct to make this easier.
Explain constructor and destructor with an example using C#.NET.
Explain constructor and destructor with an example using C#.NET.
A constructor is a member function that performs the task of initializing the objects with the default values to be assigned after creation.
A destructor is a function that is run to release the resources held by an object when it is no longer needed by the application.
In C#.NET we can create constructor and destructor in the following manner:
-----------------CONSTRUCTOR---------
class C
{
private int x;
private int y;
public C (int i, int j)
{
x = i;
y = j;
}
public void display ()
{
Console.WriteLine(x + "i+" + y);
}
}
-----------------DESTRUCTOR---------
class D
{
public D()
{
// constructor
}
~D()
{
// Destructor
}
}
