Difference between abstract method and virtual method??

Question

Munesh Sharma · Answer

Difference between Virtual method and Abstract method S.No Virtual method Abstract method 1 Overriding : Virtual method may or may not override by inherited class. i.e.,Virtual method provide the derived class with the option of overriding it. Virtual = = Overridable Overriding : An abstract method should be overriden by inherited class. i.e.,Abstract method forces the derived class to override it. abstract == MustOverride 2 Implementation: Virtual method has an implementation. Implementation: Abstract method does not provide an implementation. 3 Necessity to Implement: Virtual methods allow subclasses to provide their own implementation of that method using the override keyword Necessity to Implement: Abstract methods in a class contain no method body, and are implicitly virtual 4 Scope : Virtual methods scope to members only. Scope : Abstract method's scope to members and classes 5 Instancing : Virtual methods - Not applicable, as we can't create instance for members, it is possible only with classes. Instancing : Abstract method - directly NO, but other way,Yes.We can create an instance of a class that derives from an abstract class. And we can declare a type Abstract class and instantiate that as a derived class. Example: public abstract class Test { public abstract void A(); // Abstract method public virtual void B() { Console .WriteLine( "Test.B" ); } // Virtual Method } public class InheritedTest : Test { public override void A() { Console .WriteLine( "InheritedTest.A" ); } //Method B implementation is optional public override void B() { Console .WriteLine( "InheritedTest.B" ); } }