can we override method if its not defined as a virtual in base class???

Question

can we override a method if its not defined as a virtual in base class???

Karthikeyan K · Answer

Hi sir, If the answer is correct Kindly Accept my answer .................................................................................................................................................. Karthikeyan K

Karthikeyan K · Answer

Hi sir, No, you cannot override a non-virtual . The closest thing you can do is hide the method by creating a new method with the same name but this is not advisable as it breaks good design principles. But even hiding a method won't give you execution time polymorphic dispatch of method calls like a true virtual method call would. Consider this example: using System ; class Example { static void Main () { Foo f = new Foo (); f . M (); Foo b = new Bar (); b . M (); } } class Foo { public void M () { Console . WriteLine ( "Foo.M" ); } } class Bar : Foo { public new void M () { Console . WriteLine ( "Bar.M" ); } } In this example both calls to the M method print Foo.M . As you can see this approach does allow you to have a new implementation for a method as long as the reference to that object is of the correct derived type but hiding a base method does break polymorphism. I would recommend that you do not hide base methods in this manner. I tend to side with those who favor C#'s default behavior that methods are non-virtual by default (as opposed to Java). I would go even further and say that classes should also be sealed by default. Inheritance is hard to design for properly and the fact that there is a method that is not marked to be virtual indicates that the author of that method never intended for the method to be overridden. Edit: "execution time polymorphic dispatch" : What I mean by this is the default behavior that happens at execution time when you call virtual methods. Let's say for example that in my previous code example, rather than defining a non-virtual method, I did in fact define a virtual method and a true overridden method as well. If I were to call b.Foo in that case, the CLR would correctly determine the type of object that the b reference points to as Bar and would dispatch the call to M appropriately.

Azeem Anzari · Answer

you cannot override non virtual methods