c# casting with is and as

Question

I need some help. It is pretty easy. I have this piece of code, and I would like to discuss if it is correct, or if you suggest a better way to do it. I have an idea about the a

Answer 1

If you're using it this way, you only need to cast it ones:

var myObjectA = (myObject as ClassA);

if (myObjectA != null)
{
    myObjectA.MethodJustInA();
} 
else
{
    var myObjectB = (myObject as ClassB);

    if (myObjectB != null)
    {
        myObjectB.MethodJustInB();
    }
}

And in C# 7.0 you can do:

if (myObject is ClassA myObjectA)
    myObjectA.MethodJustInA();
else 
    if (myObject is ClassB myObjectB)
        myObjectB.MethodJustInB();