2022/07/11 (增加連結)
Behavioral Design Patterns主要是一些class與class的互動關係(溝通方式)，不同的pattern要解決不同的問題。
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反覆器模式(Iterator) (c#)
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觀察者模式 (c#)
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狀態模式(State Pattern) (c#)
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[Design Pattern實例] 在ASP.NET Core利用狀態模式來製造View Model (State) (.net)
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Avoid ugly If/else blocks & make your code modular with Strategy (javascript)
策略模式筆記 (c#)
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ILogger是個interface
public interface ILogger
{
void Debug(string msg);
void Warn(string msg);
void Error(string msg);
}
TextLogger實作ILogger
public class TextLogger:ILogger
{
public void Debug(string msg) => System.Diagnostics.Trace.WriteLine($"(Text)Debug: {msg}");
public void Warn(string msg) => System.Diagnostics.Trace.WriteLine($"(Text)Warn: : {msg}");
public void Error(string msg) => System.Diagnostics.Trace.WriteLine($"(Text)Error: : {msg}");
}
DbLogger實作ILogger
public class DbLogger:ILogger
{
public void Debug(string msg) => System.Diagnostics.Trace.WriteLine($"(Database)Debug: {msg}");
public void Warn(string msg) => System.Diagnostics.Trace.WriteLine($"(Database)Warn: : {msg}");
public void Error(string msg) => System.Diagnostics.Trace.WriteLine($"(Database)Error: : {msg}");
}
MyTask連接interface (ILogger)
public class MyTask
{
private ILogger _logger = null;
public MyTask(ILogger logger)
{
if (logger != null)
this._logger = logger;
else
throw new ArgumentNullException("logger");
}
public void Run()
{
//Do something
this._logger.Debug($"My task was done on {DateTime.Now.ToString()}");
}
}
當一開始的時候，先利用文字檔來儲存log，因為一開始，多花一點小功夫，多寫一個interface(ILogger)
//For current iteration
ILogger logger = new TextLogger();
(new MyTask(logger)).Run();
等準備好了，只要改這個部分，其他的就不需要動了
//Refine in next iteration
ILogger logger = new DatabaseLogger();
(new MyTask(logger)).Run();
網頁上(\Controllers\UploadController.cs)遺漏了部分的程式碼:
[HttpPost]
public IActionResult Index(string fileType, FreightOrder fo)
{
ModelState.Clear();
IFoStrategy stg = null;
if (fileType.Equals("1"))
{
stg = new FoStrategyAppend();
ViewBag.Strategy = "採用策略：累加原單之數量";
}
else
{
stg = new FoStrategyReplace();
ViewBag.Strategy = "採用策略：覆蓋原單之數量";
}
stg.Query = DataAccessService.Query;
stg.Update = DataAccessService.Update;
updateFreightOrder(fo, stg);
return View(fo);
}
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Template Method
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