How can we acheive inheritance in VB.NET ? Dot Net Interview Questions

punjabtechnicaluniversity.blogspot.in


Note:- The following explanation is for VB.NET

Inheritance is achieved by using “Inherits” keyword in VB.NET (For C# it is “:”).Simple Sample is provided in CD for understanding inheritance in folder “WindowsApplicationInheritance”.There are two classes one is the parent “ClsParent” and second is the child “ClsChild”.Parent class has a string which has to parsed for junk data “@” and “/”.ClsParent has the functionality which parses only cleans up “@”.”ClsChild” then inherits from parent and adds extra functionality by parsing “/”.

Public Class ClsParent
Protected strData As String = “jksdhkj@dadad///ajkdhsjakd”
Public Function Parse() As String
Dim PstrData As String
PstrData = strData
PstrData = Replace(PstrData, “@”, “”)
Return PstrData
End Function
Public Function GetActualString() As String
Return strData
End Function
End Class
Above is the source which parses only “@” of strData variable.
Public Class ClsChild
Inherits ClsParent
‘ this is child and a special parse function is added which will
also parse “/”
Public Function ParseBackSlash()
Dim PstrData As String
PstrData = Me.Parse()
PstrData = Replace(PstrData, “/”, “”)
Return PstrData
End Function
End Class

Above is the source code for “ClsChild” which does the remaining work.It adds extra functionality by parsing “/” junk character’s of the data.

Note:- Strdata was accessible only because it was defined as protected in the parent class.

Inheritance in action