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Question: What is the difference between shadow and override

Answer: Shadowing :- This is a VB.Net Concept by which you can provide a new implementation for the base class member without overriding the member. You can shadow a base class member in the derived class by using the keyword "Shadows". The method signature,access level and return type of the shadowed member can be completely different than the base class member.

Hiding : - This is a C# Concept by which you can provide a new implementation for the base class member without overriding the member. You can hide a base class member in the derived class by using the keyword "new". The method signature,access level and return type of the hidden member has to be same as the base class member.Comparing the three :-

1) The access level , signature and the return type can only be changed when you are shadowing with VB.NET. Hiding and overriding demands the these parameters as same.

2) The difference lies when you call the derived class object with a base class variable.In class of overriding although you assign a derived class object to base class variable it will call the derived class function. In case of shadowing or hiding the base class function will be called.



Category C# Interview Questions & Answers - Exam Mode / Learning Mode
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Question: What is the difference between shadow and override


Answer:

Shadowing :- This is a VB.Net Concept by which you can provide a new implementation for the base class member without overriding the member. You can shadow a base class member in the derived class by using the keyword "Shadows". The method signature,access level and return type of the shadowed member can be completely different than the base class member.

Hiding : - This is a C# Concept by which you can provide a new implementation for the base class member without overriding the member. You can hide a base class member in the derived class by using the keyword "new". The method signature,access level and return type of the hidden member has to be same as the base class member.Comparing the three :-

1) The access level , signature and the return type can only be changed when you are shadowing with VB.NET. Hiding and overriding demands the these parameters as same.

2) The difference lies when you call the derived class object with a base class variable.In class of overriding although you assign a derived class object to base class variable it will call the derived class function. In case of shadowing or hiding the base class function will be called.
Source: CoolInterview.com


There are two main Differences between Shadowing and Overriding.
1) Overriding redefines only the implementation but shadowing redefines the whole Element.
2)In Overriding dervied Class can refer the Base class using ME Keyword but in shadowing we can access it using "MYBase". Source: CoolInterview.com

Answered by: Praveen Sundar P.V | Date: 9/11/2007 10:30:56 AM | Contact Praveen Sundar P.V Contact Praveen Sundar P.V

Shadowing: It hides a base class member in the derived by using the "New" keyword.
It is used to explicitly hide a member inherited from base class.
new and override both cannot be used for the same member.

eg:-
class Employee
{
public virtual double CalculateSalary()
{
return basic_salary;
}
}
class SalesPerson: Employee
{
double sales,comm;
public new double CalculateSalary()
{
return basic_salary+(sales*comm);
}
}
static void main(string[] args)
{
SalesPerson sal=new SalesPerson();
double s=sal.CalculateSalary();
Console.WriteLine(s);
}

Overriding:In this methods have same names,same signatures,same return types but in different classes.
C# uses virtual and override keyword for method overriding.

eg:-
class Employee
{
public virtual double CalculateSalary()
{
return basic_salary;
}
}
class SalesPerson: Employee
{
double sales,comm;
public override double CalculateSalary()
{
return basic_salary+(sales*comm);
}
}
static void main(string[] args)
{
Employee sal=new SalesPerson();
double s=sal.CalculateSalary();
Console.WriteLine(s);
}

When you call the derived class object with a base class variable.In class of overriding although you assign a derived class object to base class variable it will call the derived class function. In case of shadowing or hiding the base class function will be called.
Source: CoolInterview.com

Answered by: Anant | Date: 1/7/2010 | Contact Anant Contact Anant


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