Convert derived class to base class

Question

I\'m trying to refresh my memory but can\'t find answers with Google.

public class BaseClass
{
    public virtual void DoSomething()
    {
        Trace.Writ         


        

Answer 1

The solutions with new instead of override break the polymorphism. Recently I came to the same problem and implemented it the following way. My solution has the following advantages:

• virtual and override stays in place;
• name BaseClass is not used directly in the type cast, so if I introduce an intermediate MiddleClass in the hierarchy between BaseClass and DerivedClass, which also implements DoSomething(); then the MiddleClass's implementation won't be skipped.

This is the implementation:

public class BaseClass
{
    public virtual void DoSomething()
    {
        Trace.Write("base class");
    }
}

public class DerivedClass : BaseClass
{
    public override void DoSomething()
    {
        Trace.Write("derived class");
    }

    public void BaseDoSomething()
    {
        base.DoSomething();
    }
}

The usage is:

    DerivedClass dc = new DerivedClass();

    dc.DoSomething();

    dc.BaseDoSomething();