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c# - to call an abstract method in a function of an abstract class

I am currently writing code in Unity C#
When calling an abstract method (function with abstract) in a function of an abstract class
It seems that the method is undefined and an error occurs

How do you describe it when I want to abstract only a specific processing part such as the following?
Is there no choice but to force a default by using virtual for the time being?

abstract class BaseShopRegister{
    protected abstract uint CalcTax(uint cost);
    public void CalcCost(uint cost){
        return CalcTax(cost);// error here.
    }
}
class ShopRegister_Old :BaseShopRegister{
    protected override uint CalcTax(uint cost){
        return cost * 1.05f;
    }
}
class ShopRegister_New :BaseShopRegister{
    protected override uint CalcTax(uint cost){
        return cost * 1.10f;
    }
}

virtual version.

class BaseShopRegister{
    protected virtual uint CalcTax(uint cost){
        return cost;// Force default process? .
    }
    public void CalcCost(uint cost){
        return CalcTax(cost);
    }
}
c# unity
  • Answer # 1

    Excuse me. I wasn't sure what the error was.
    I was doing something like this using gameObject and it was just null access.

    Calling an abstract method in a function of an abstract class can be done without problems! !! !!

    abstract class BaseShopRegister{
    protected abstract uint CalcTax(uint cost);
    public void CalcCost(uint cost){
        return CalcTax(cost);// error here.
    }
}
class ShopRegister_Old :BaseShopRegister{
    public void CalcCost(uint cost){
        base.CalcCost(cost);
        Transform trans;
        trans = transform.Find("CostTextUI");
        Cost_UI_Text = trans.GetComponent<Text>();
    }
    protected override void CalcTax(uint cost){
        Cost_UI_Text.text = cost * 1.05f;// Cost_UI_Text is still null.
    }
    Text Cost_UI_Text;
}

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