Design Patterns in .NET Core 3: Reusable Approaches in C# and F# for Object-Oriented Software Design

© Dmitri Nesteruk 2020

D. NesterukDesign Patterns in .NET Core 3https://doi.org/10.1007/978-1-4842-6180-4_20

20. Null Object

Dmitri Nesteruk¹  

(1)

St. Petersburg, c.St-Petersburg, Russia

 

We don’t always choose the interfaces we work with. For example, I’d rather have my car drive me to my destination by itself, without me having to give 100% of my attention to the road and the dangerous lunatics driving next to me. And it’s the same with software: sometimes you don’t really want a piece of functionality, but it’s built into the interface. So what do you do? You make a Null Object.

Scenario

Suppose you inherited a library that uses the following interface:

public interface ILog

{

  void Info(string msg);

  void Warn(string msg);

}

The library uses this interface ...