Code inspection: Parameter of the constructor can be declared with the base type

This inspection reports a constructor parameter declared as a concrete type even though the constructor only uses base-type or interface members. This makes the constructed type less coupled to one implementation and allows more callers to pass compatible objects.

Example

                interface ILogger
                {
                    void Log(string message);
                }
                class ConsoleLogger : ILogger
                {
                    public void Log(string message) { }
                }
                class Service
                {
                    public Service(ConsoleLogger logger)
                    {
                        logger.Log("started");
                    }
                }
            

                interface ILogger
                {
                    void Log(string message);
                }
                class ConsoleLogger : ILogger
                {
                    public void Log(string message) { }
                }
                class Service
                {
                    public Service(ILogger logger)
                    {
                        logger.Log("started");
                    }
                }
            

Quick-fix

Change the constructor parameter type to the suggested base type or interface.

29 March 2026