gistfile1.txt

interface ILogger
{
	void Log(string message);
}

class WriteToLogFile
{
	private string _logFilePath;

	public string LogFilePath
	{
		get
		{
			if (string.IsNullOrEmpty(_logFilePath))
			{
				_logFilePath = ConfigurationManager.AppSettings["LogFilePath"];
			}

			return _logFilePath;
		}

		set
		{
			_logFilePath = value;
		}
	}

	public void Log(string message)
	{
		// TODO: Implement the actual logging stuff...
	}
}

class MyController : Controller
{
	private ILogger _logger;

	public MyController(ILogger logger)
	{
		_logger = logger;
	}

	public ActionResult Log(string message)
	{
		_logger.Log(message);

		return Content("It was logged!");
	}
}