CODEWITHSUNDEEP
c#.netc#-4.0interface
user987316
user987316

Reputation: 942

How to derive two abstract classes in C#

I have app structure -

public abstract class a 
{
}
//defined in a.dll
public abstract class b
{
}
//defined in b.dll

//Above 2 DLL reference added in main project where I want to derive both of this abstract classee like

public abstract class proj : a, b
{
}

I am able to derive any one of it only not both. So pls guide me on missing things or wrong coding I had done.

Upvotes: 2

Views: 16904

Answers (4)

Darren
Darren

Reputation: 70728

You can't multiple inherit using C#. You can however achieve this by using an interface. 

public interface Ia 
{

}

public interface Ib 
{

}

public abstract class MainProject : Ia, Ib  
{

}

C# interfaces only allow signatures of methods, properties, events and indexers. You will have to define the implementation of these in the proj (MainProgram) class.

Upvotes: 11

Botz3000
Botz3000

Reputation: 39610

You can't derive from two classes at the same time. You should use interfaces instead. 

public interface IFirstInterface
{
}
public interface ISecondInterface
{
}

public abstract class Proj : IFirstInterface, ISecondInterface
{
}

Now classes that inherit from Proj will still need to implement all methods and properties defined in both interfaces.

Upvotes: 1

Roger Rowland
Roger Rowland

Reputation: 26259

Rather than deriving from multiple abstract classes (which is illegal in C#), derive from two interfaces, (which are abstract by definition).

Upvotes: 1

kemiller2002
kemiller2002

Reputation: 115488

public abstract class proj : a, b

This can't be done. C# doesn't allow multiple inheritance.

Upvotes: 2

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