Calling the overridden method from the base class in C#

Question

Given the following C# class definitions and code:

 public class BaseClass {     public virtual void MyMethod()     {         ...do something...     } }  public class A : BaseClass {     public override void MyMethod()     {         ...do something different...     } }  public class B : BaseClass {     public override void MyMethod()     {         ...do something different...     } }  public class AnotherObject {     public AnotherObject(BaseClass someObject)     {         someObject.MyMethod(); //This calls the BaseClass method, unfortunately.     } } 

I would like to call the MyMethod() that is actually found in A or B, assuming the object passed in is actually an instance of A or B, not that which is found in BaseClass. Short of doing something like this:

 public class AnotherObject {     public AnotherObject(BaseClass someObject)     {         A temp1 = someObject as A;         if (A != null)         {             A.MyMethod();         }                  B temp2 = someObject as B;         if (B != null)         {             B.MyMethod();         }     } } 

How can I do it?

Answer 1

Which method is called is determined via polymorphism on the type that is passed into the AnotherObject constructor:

AnotherObject a = new AnotherObject(new A()); // invokes A.MyMethod()  AnotherObject b = new AnotherObject(new B()); // invokes B.MyMethod()  AnotherObject c = new AnotherObject(new BaseClass()); //invokes BaseClass.MyMethod()