What should be use virtual or new in c#? What will be criteria to select among them?

Asked Feb 17 '15 at 09:19

Active Feb 17 '15 at 10:45

Viewed 55 times

I am new to C# coding. I implemented following code and facing a warning.

class Base {
    public static Base Getinstance() {
        return new Base();
    }
}

class Derived : Base {
   // getting warning Derived.getInstance()' hides inherited member
   //'Base.getInstance()'. Use the new keyword if hiding was intended
   public static Derived Getinstance() {
        return new Derived();
   }
}

In order to remove the warning I have 2 options

use virtual in base class
write new in derived class
any other (please suggests if have anything else)

Which will be the right way to solve this warning?

edited Feb 17 '15 at 10:45

marc_s

732,580
175
1,330
1,459

asked Feb 17 '15 at 09:19

Suri

3,287
9
45
75

6

Use `virtual` if you want to do proper inheritance, use `new` if you want to see the world burn. – Jeroen Vannevel Feb 17 '15 at 09:22
Ready to set the world on fire – SimpleVar Feb 17 '15 at 09:22
1

You have an apple and an orange. Which is the right to eat? – zerkms Feb 17 '15 at 09:22
@zerkms He has an apple and an orange, and he asks how each tastes. That is totally legit. – SimpleVar Feb 17 '15 at 09:23
3

Please do read about the keywords on MSDN, as it is explained pretty well. – Samuel Feb 17 '15 at 09:23
@JeroenVannevel: too categorically. Sometimes `new` is quite applicable. – Dennis Feb 17 '15 at 09:24
@zerkms The two are massively different; this question is an important one in terms of understanding C#'s object model. – Dan Puzey Feb 17 '15 at 09:24
I'm voting to close this question as off-topic because it is perfectly well explained in the official documentation: https://msdn.microsoft.com/en-us/library/ms173153.aspx – Jeroen Vannevel Feb 17 '15 at 09:25
@DanPuzey I did not say it's not important. My analogy was about "they are different" – zerkms Feb 17 '15 at 09:26
@YoryeNathan I cannot agree with you. The question is about which one to use without providing the requirements a solution must satisfy. – zerkms Feb 17 '15 at 09:27
@zerkms Yes, as the question currently stands, you are correct. – SimpleVar Feb 17 '15 at 09:30

What should be use virtual or new in c#? What will be criteria to select among them?

0 Answers0