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(Page créée avec « Category:CSharp Category:Design Patterns = Description = * Decouple an abstraction from its implementation so that the two can vary independently ») |
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| (5 versions intermédiaires par le même utilisateur non affichées) | |||
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[[Category:Design Patterns]] | [[Category:Design Patterns]] | ||
= Description = | = Description = | ||
Decouple an abstraction from its implementation so that the two can vary independently. | |||
* Select or switch implementations at runtime | |||
* Replace the implementation by another one without having to modify the referencing class by using an interface | |||
* It can also be thought of as two layers of abstraction | |||
= Exemple = | |||
* The client can change the {{boxx|*Logger}} classes by another without having to modify the {{boxx|UserService}}. | |||
<filebox fn='ILogger.cs'> | |||
public interface ILogger | |||
{ | |||
void WriteLine(string text); | |||
} | |||
</filebox> | |||
<filebox fn='ConsoleLogger'> | |||
public class ConsoleLogger : ILogger | |||
{ | |||
public void WriteLine(string text) | |||
{ | |||
Console.WriteLine(text); | |||
} | |||
} | |||
</filebox> | |||
<filebox fn='IUserService.cs'> | |||
public interface IUserService | |||
{ | |||
void ChangePassword(int userId, string newPassword); | |||
} | |||
</filebox> | |||
<filebox fn='UserService.cs'> | |||
public class UserService : IUserService | |||
{ | |||
private ILogger logger; | |||
public UserService(ILogger logger) | |||
{ | |||
this.logger = logger; | |||
} | |||
public void ChangePassword(int userId, string newPassword) | |||
{ | |||
logger.WriteLine($"Password has been change for user {userId}."); | |||
} | |||
} | |||
</filebox> | |||
<kode lang='cs'> | |||
IUserService userService = new UserService(new ConsoleLogger()); | |||
userService.ChangePassword(1, "0000"); | |||
</kode> | |||
Dernière version du 7 juin 2020 à 15:30
Description
Decouple an abstraction from its implementation so that the two can vary independently.
- Select or switch implementations at runtime
- Replace the implementation by another one without having to modify the referencing class by using an interface
- It can also be thought of as two layers of abstraction
Exemple
- The client can change the *Logger classes by another without having to modify the UserService.
| ILogger.cs |
public interface ILogger
{
void WriteLine(string text);
}
|
| ConsoleLogger |
public class ConsoleLogger : ILogger
{
public void WriteLine(string text)
{
Console.WriteLine(text);
}
}
|
| IUserService.cs |
public interface IUserService
{
void ChangePassword(int userId, string newPassword);
}
|
| UserService.cs |
public class UserService : IUserService
{
private ILogger logger;
public UserService(ILogger logger)
{
this.logger = logger;
}
public void ChangePassword(int userId, string newPassword)
{
logger.WriteLine($"Password has been change for user {userId}.");
}
}
|
|
IUserService userService = new UserService(new ConsoleLogger()); userService.ChangePassword(1, "0000"); |
