Question

In the following example “Test that v1 function was called” fails. Is there a way to force call the base implementation of “RunFunction” through an instance of “class V2” ?

    class V1 
    {
        public virtual string RunFunction()
        {
            return "V1";
        }
    }

    class V2 : V1
    {
        public override string RunFunction()
        {
            return "V2";
        }
    }



    [Test]
    public void TestCall()
    {
        var v1 = (V1)new V2();
        var v2 = new V2();

        Assert.IsTrue(v1.RunFunction() == "V1", "Test that v1 function was called");
        Assert.IsTrue(v2.RunFunction() == "V2", "Test that v2 function was called");
    }

Thanks for looking, guys and gals.

Answer 1

The whole point of class inheritance is that it allows you to override selected base class behavior.

You can use the base keyword from within V2 to call into base-class code from V1, but you cannot do that outside of the class. Just as a quick example of usage:

class V2 : V1
{
    public override string RunFunction()
    {
        return base.RunFunction();
    }
}

Alternatively you could instantiate an instance of V1:

var v1 = new V1();