common property and methods between classes

Question

Hi,

I have some classes that share between their methods and properties: for example class A call method of class B and both class must have common field/property

Common methods/property are several!

I thought of this approach

//------------------------------------------------------

// CLASS 'A'

//------------------------------------------------------

public class A

{

public A Instance{get{return this;}}

public IB b;

public float FieldA;

public void DoSomethingA()

{

FieldA = b.DoSomethingB ();

}

}

//------------------------------------------------------

// INTERFACE + CLASS 'B'

//------------------------------------------------------

public interface IB

{

B Instance{get;}

A a {get;set;}

float DoSomethingB();

}

public class B:IB

{

public B Instance{get{return this;}}

public A a {get;set;}

public virtual float DoSomethingB()

{

return a.FieldA * 0.5F;

}

}

//------------------------------------------------------

// CLASS B2

//------------------------------------------------------

public class B2:B

{

public override float DoSomethingB ()

{

return a.FieldA * 2.0F;

}

}

//------------------------------------------------------

// CLASS TEST

//------------------------------------------------------

public class test

{

public A a = new A();

public IB b;

public test (IB b)

{

this.b = b;

b.a = a.Instance;

a.b = b.Instance;

// other

}

}

public static void Main (string[] args)

{

test t = new test (new B());

t.a.FieldA = 5;

t.a.DoSomethingA();

Console.WriteLine (t.a.FieldA ); // return 2.5

test t1 = new test (new B2()); // return 10

t1.a.FieldA = 5;

t1.a.DoSomethingA();

Console.WriteLine (t1.a.FieldA );

}

 

Essentially in the class test pass the class instance A to the class B and vice versa (and thus also for future classes).

When i create a new instance of test i decide if use class B or B2 (trough interface).

This approach is correct or i'm in a wrong way?