Constructor Parameters and Inheritance

Question

New to OOP and I\'m confused by how derived-class constructors work when inheriting from a base class in C#.

First the base class:

class BaseClass
{
         


        

Answer 1

public SubClass(string BaseString, string SubString) : base(BaseString)

This constructor in the derived class says that when you receive two arguments BaseString and SubString, call the base class's constructor with BaseString.

Thus, doing

public SubClass(string a, string b) : base(BaseString)

doesn't work, because you are telling it to call the base class's constructor with BaseString but there is no argument called BaseString.

If you want to instantiate the derived class without passing a String to the base class constructor, the base class needs a default constructor:

public BaseClass() { }