Created
September 19, 2012 20:28
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Explicit Dependencies
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using System; | |
using System.IO; | |
using System.Linq; | |
namespace ExplicitDependencies | |
{ | |
class Program | |
{ | |
static void Main(string[] args) | |
{ | |
var customer = new Customer() | |
{ | |
FavoriteColor = "Blue", | |
Title = "Mr.", | |
Fullname = "Steve Smith" | |
}; | |
var response = new PersonalizedResponse(new SimpleFileLogger(), new SystemDateTime()); | |
Console.WriteLine(response.GetResponse(customer)); | |
Console.ReadLine(); | |
} | |
} | |
public interface ILogger | |
{ | |
void Log(string message); | |
} | |
public class SimpleFileLogger : ILogger | |
{ | |
public void Log(string message) | |
{ | |
using (StreamWriter logFile = new StreamWriter( | |
Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), | |
"logfile.txt"))) | |
{ | |
logFile.WriteLine(message); | |
} | |
} | |
} | |
public interface IDateTime | |
{ | |
DateTime Now { get; } | |
} | |
public class SystemDateTime : IDateTime | |
{ | |
public DateTime Now | |
{ | |
get | |
{ | |
return DateTime.Now; | |
} | |
} | |
} | |
public class Customer | |
{ | |
public string FavoriteColor { get; set; } | |
public string Title { get; set; } | |
public string Fullname { get; set; } | |
} | |
public class PersonalizedResponse | |
{ | |
private readonly ILogger _logger; | |
private readonly IDateTime _dateTime; | |
public PersonalizedResponse(ILogger logger, | |
IDateTime dateTime) | |
{ | |
this._dateTime = dateTime; | |
this._logger = logger; | |
} | |
public string GetResponse(Customer customer) | |
{ | |
_logger.Log("Generating personalized response."); | |
string formatString = "Good {0}, {1} {2}! Would you like a {3} widget today?"; | |
string timeOfDay = "afternoon"; | |
if (_dateTime.Now.Hour < 12) | |
{ | |
timeOfDay = "morning"; | |
} | |
if (_dateTime.Now.Hour > 17) | |
{ | |
timeOfDay = "evening"; | |
} | |
return String.Format(formatString, timeOfDay, | |
customer.Title, | |
customer.Fullname, | |
customer.FavoriteColor); | |
} | |
} | |
} |
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