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What are the advantages and disadvantages of each of these?
When one should choose what? What are the points one should keep in mind when making this decision?
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An abstract method is implicitly a virtual method. Abstract method declarations are only permitted in abstract classes. public abstract void MyMethod(); The implementation is provided by a method override, which is a member of a non-abstract class.
The basic difference between a virtual and abstratc class is that methods in virtual class CAN be overridden in derived classes, while abstract class methods MUST be overridden. Hope this helps! virtual classes do not require any methods to be overriden and can be constructed as is without the need of extending.
The C# programming language provides support for both virtual and abstract methods, each of which has distinct advantages. You use virtual methods to implement late binding, whereas abstract methods enable you to force the subclasses of the type to have the method explicitly overridden.
Abstract Method resides in abstract class and it has no body. Abstract Method must be overridden in non-abstract child class. Virtual Method can reside in abstract and non-abstract class. It is not necessary to override virtual method in derived but it can be. Virtual method must have body ....can be overridden by "override keyword".....
An abstract method is one method. An abstract class can contain several methods, and so can an interface. The difference between those two is that an abstract class can have implementations for some of its methods, while an interface doesn't have any implementations. (Usually.
What is the difference between virtual and abstract functions in C#? Abstract methods do not provide an implementation and they force the derived classes to override the method. It is declared under abstract class. An abstract method only has the method definition
If an abstract method is defined in a class, then the class should declare as an abstract class. An abstract method should contain only method definition, should not Contain the method body/implementation. An abstract method must be over ride in the derived class.
Virtual and abstract are almost the same. A virtual method has an implementation in the base class that can optionally be overridden, while an abstract method hasn't and must be overridden in a child class. Otherwise they are the same. Choosing between them depends on the situation. If you got a base implementation, you use virtual. If you don't, and you need every descendant to implement it for itself, you choose abstract.
Interface methods are implementations of a method that is declared in an interface that the class implements. This is quite unrelated to the other two. I think a method can be both virtual and interface. The advantage of interfaces is that you declare one interface (duh) that can be implemented by two totally different classes. That way, you can run the same code on two different classes, as long as the methods you'd like to call are declared in an interface they share.
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