Overriding and Shadowing in C#

[Sheenas]

Hello, I am learning the C# programming and now I am confused about the Overriding and Shadowing in C#. I have learned it carefully. But, the concept of both of them are not able to understand. If anyone is having details about it, then please provide me help regarding it.

[opaper]

• Shadowing : Here, super class reference able to make use of the subclass object but it is not able to get the access of the subclass member.
• Overloading: Here, Super class reference able to make use of the subeclass object and also have the access of the sub class members.
• There are many problems occur while using the shadowing and that is why .net had come up with the concept of the overloading.

[MindSpace]

Overriding and Shadowing are used to change the working of the members of a base class. If you are making use of the Shadowing then it is concept of the VB.NET. If you are making use of the C# then you will call it as hiding. If you are making use of the shadowing then you will simply use the new implementation to the base class member than overriding it. That means make shadow of the existing base class in your derived class. For that you will make use of the shadow keyword. In C# for this new keyword is used. In case of the Overriding directly new implementation of derived class is used. If you are working on the VB.NET then you will make use of the overrides keyword and in C# you will make use of the override keyword.

[Praetor]

If you want difference between the Overriding and Shadowing in C# then you can make use of the points below:

• Purpose of Shadowing in C# : It will protect the base class modification.
• Purpose of Overriding in C#: It will provide you help for achieving polymorphism.
• In Shadowing you can redefine any element type .
• In Overriding in C# only a Function or Sub or property can be redefined.
• Shadowing in C#Accessibility is having more accessibility.
• Overriding in C# unable to expand the accessibility of overridden element.

[Katty]

The code below mentioned will provide you more help to understand the Overriding and Shadowing in C# :
Shadowing in C#:

Class Older
{
virtual protected shadowingtest()
{
}
}
Class First : Older
{
protected override shadowingtest()
{
}
}

Overriding in C#:

Class Overridingtest
{
public string First( int i )
{
}
public string First( string s) 
{
}
public string First( int i, int j) 
{
}
}

[Zecho]

I think you may need to use the books below to get more details about the Overriding and Shadowing in C#:

• Pro C# 2008 and the .NET 3.5 Platform, Fourth Edition (Windows.Net) by Andrew Troelsen
• Illustrated C# 2008 (Windows.Net) by Daniel Solis
• Professional C# 2008 by Christian Nagel, Bill Evjen, Jay Glynn, and Morgan Skinner
• Essential LINQ (Microsoft .NET Development Series) by Charlie Calvert and Dinesh Kulkarni
• Microsoft Visual C# 2008 Step by Step by John Sharp