C# (CSharp) IAmACommandCounter примеры использования

Пример #1

 public RunStuff(IAmACommandCounter commandCounter)
 {
     _commandCounter = commandCounter;
 }

Пример #2

 public CompetingConsumerCommandHandler(IAmACommandCounter commandCounter)
 {
     _commandCounter = commandCounter ?? throw new ArgumentNullException(nameof(commandCounter));
 }