Multiple Inheritance in C# and VB.NET

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C# and VB.NET supports single inheritance, however they do support multiple 'interface' inheritance:

Here's a sample demonstrating the same:

C#

//Single Inheritance

public class A

{

    public A() { }

}

public class B : A

{

    public B() { }

}

//Multiple Interface Inheritance

interface IComparable

{

    int CompareTo(object obj);

}

interface ISomethingElse

{

    int EqualTo();

}

public class Z :  IComparable, ISomethingElse

{

    public int CompareTo(object obj)

    {

        // implementation code goes here 

    }

public int EqualTo()

    {

        // implementation code goes here 

    }

}

VB.NET

'Single Inheritance

Public Class A

    Public Sub New()

    End Sub

End Class

Public Class B

    Inherits A

    Public Sub New()

    End Sub

End Class

'Multiple Interface Inheritance

Friend Interface IComparable

    Function CompareTo(ByVal obj As Object) As Integer

End Interface

Friend Interface ISomethingElse

    Function EqualTo() As Integer

End Interface

Public Class Z

    Implements IComparable, ISomethingElse

    Public Function CompareTo(ByVal obj As Object) _

     As Integer Implements IComparable.CompareTo

        ' implementation code goes here 

    End Function

    Public Function EqualTo() As Integer Implements _

       ISomethingElse.EqualTo

        ' implementation code goes here 

    End Function

End Class

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About The Author

Suprotim Agarwal, Developer Technologies MVP (Microsoft Most Valuable Professional) is the founder and contributor for DevCurry, DotNetCurry and SQLServerCurry. He is the Chief Editor of a Developer Magazine called DNC Magazine. He has also authored two Books - 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook.

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