c#覆盖类型比较“是”？

Question

I'm trying to do something here and I may not be doing it right...

I have a base class "Damage", and a derived class "Melee : Damage", and another derived class "Ranged : Damage".

Then I have a "Unit" class, and a derived class "Warrior : Unit", and another derived class "archer : Unit".

So the unit class could be either a warrior which would be melee, or an archer which would be ranged.

So in my Unit class, I define a variable of type "Public Damage dmg".

Then in the constructor for Warrior, I set the "this.dmg = new Melee(dmg_amount);" and in the constructor for archer, I set the "this.dmg = new Ranged(dmg_amount);"

Now I start passing around this unit.dmg variable throughout my code, and in some places I no longer really know that it's an archer or a warrior anymore, I just know the damage. So what I'm trying to do is check the damage type, via some code such as:

if (unit.dmg is Melee) {}

However, it tells me that "the given expression is never the provided ('Melee') type".

and I can understand why: I declared this.dmg to be of type "Damage". I guess I was hoping that when I set it to = new Melee() then it would forever remember that it is Melee damage, without further ado.

What is the easiest way to know that the Damage is Melee?

Answer 1

Thanks for the comments guys. When I saw the +1's that it should work, I looked again and found my problem. I had tried to test it with this line of code:

Debug.Write("Does this.dmg == Melee?" + this.dmg is Melee));

Which of course gave the error, because I forgot the brackets. I corrected it to:

Debug.Write("Does this.dmg == Melee?" + (this.dmg is Melee)));

and the problem is gone. I also took the time to test it various ways to make sure, and definitely this works. If I set it to this.dmg = Ranged(), then it no longer is "true" that it is Melee, and vise versa.