Can you explain DIP with an example in C#?

❌ Without DIP (Tightly Coupled):

public class FileLogger
{
public void Log(string message) => Console.WriteLine("File log:

" + message);

}
public class OrderService
{
private readonly FileLogger _logger = new FileLogger();
public void ProcessOrder()
{

// Logic

_logger.Log("Order processed.");

}
}

• OrderService is tightly coupled to FileLogger.

✅ With DIP (Loosely Coupled via Abstraction):

public interface ILogger
{

void Log(string message);

}
public class FileLogger : ILogger
{
public void Log(string message) => Console.WriteLine("File log:

" + message);

}
public class OrderService
{
private readonly ILogger _logger;
public OrderService(ILogger logger)
{
_logger = logger;
}
public void ProcessOrder()
{

// Logic

_logger.Log("Order processed.");

}
}

Now OrderService depends on the abstraction (ILogger), not the concrete

FileLogger. You can easily substitute with DatabaseLogger, ConsoleLogger, or a

mock in tests.