INTERVIEW QUESTIONS MICROSOFT C# DETAILS

Question: In a multilevel hierarchy how are the constructors are called

Answer: Ans: A--- TopDown

Always a parent class constructor is executed before child class' constructor does .. when u instantiate a child/derived class.

Ans: A--- TopDown

Always a parent class constructor is executed before child class' constructor does .. when u instantiate a child/derived class.
Source: CoolInterview.com

Order of execution of constructors is not always top down.
Top Down is the case with instance constructors.
But in the case of static constructors the order is reverse.

see the example below.

public class MyBase
{
public MyBase()
{
Console.WriteLine("MyBase instance constructor");
}
static MyBase()
{
Console.WriteLine("MyBase static constructor");
}
}

}

public class MyDerived : MyBase
{

static MyDerived()
{
Console.WriteLine("MyDerived static constructor");
}
public MyDerived()
{
Console.WriteLine("MyDerived instance constructor");
}
}
public class MyDerived2 : MyDerived
{

static MyDerived2()
{
Console.WriteLine("MyDerived2 static constructor");
}
public MyDerived2()
{
Console.WriteLine("MyDerived2 instance constructor");
}
}

If u are instantiatig the MyDerived2 class the output will be

MyDerived2 static constructor
MyDerived static constructor
MyBase instance constructor

MyBase instance constructor
MyDerived instance constructor
MyDerived2 instance constructor Source: CoolInterview.com

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