How to Inherit method but with different return type?

Question

Given the following classes:

ClassA
{
     public ClassA DoSomethingAndReturnNewObject()
     {}    
}

ClassB : ClassA
{}

ClassC : ClassA
{}

Answer 1

Maybe generics will be your saviour. Take a look at this link: C# Generics Part 3/4: Casting, Inheritance, and Generic Methods

bstract class  B {
   public abstract T Fct(T t);
}
class D1 : B{
   public override string Fct( string t ) { return "hello"; }
}
class D2 : B{
   public override T Fct(T t) { return default (T); }
}