採取其他接口的策略模式方法

我正在尋找利用.net應用程序的策略模式。我正在簡化代碼，但想法是一樣的。有一個交通接口，它將有兩個具體的類，摩托車，這兩個唯一的要求是實施可驅動的方法。爲了實現它，我想使用戰略模式和IDriveableStrategy接口，該接口將採用實現ITransport的類並使用該類中的信息來確定ITransport是否可驅動。我看到一些帖子質疑將背景發送給戰略的做法，但我現在想忽略這種辯論。如果我實現一個名爲MotorcycleDriveableStrategy的類，我想將其用作Motorcycle類的一個策略。採取其他接口的策略模式方法

在下面的代碼中，您會注意到我有兩個特定於Motorcycle類的附加屬性，我想用它來評估ITransport是否可驅動。在MotorcycleDriveableStrategy中，我已經註釋了理想情況下如何實現類，（因爲摩托車確實實現了ITransport，所以isDriveable實現了接口，但是當我嘗試這個時，我收到了一個編譯錯誤，所以我必須讓方法期待ITransport接口。

我能做到這一點，我想通過使IDriveableStrategy接口需要一個通用的實現ITransport

IDriveableStrategy<T> where T : ITransport

，並宣佈

MotorcycleDriveableStrategy<Motorcycle>

耦合，但我想知道如果我錯過了更大的圖片。泛型之前這將如何實現？戰略模式應該總是基於暴露的接口實現來評估上下文嗎？策略界面是否應該將界面作爲參數？有沒有另一種方法來實現這一點，而不添加numWheels到ITransport接口或使IDriveableStrategy通用？提前感謝您的任何建議或見解。

public interface ITransport 
    { 
     boolean driveable(); 
    } 

public class Car : ITransport 
{ 
    private driveableStrategy {get;set;} 
    public boolean driveable() 
    { 
     return driveableStrategy.isDriveable(); 
    } 

} 

public class Motorcycle: ITransport 
{ 
    private driveableStrategy {get;set;} 
    private int numWheels {get;set;} 
    private string weatherExceptions {get;set;} 
    public Motorcycle(IDriveableStrategy driveableStrategy,int numWheels,string weatherExceptions) 
    { 
     this.driveableStrategy = driveableStrategy; 
     this.numWheels = numWheels; 
     this.weatherExceptions = weatherExceptions; 
    } 

    public boolean driveable() 
    { 
     return driveableStrategy.isDriveable(); 
    } 

} 

public interface IDriveableStrategy 
{ 
     boolean isDriveable(ITransport transport); 
} 

public class MotorcycleDriveableStrategy 
{ 
     //What i would like to do 
     /*public boolean isDriveable(Motorcycle transport) 
      { 
       return transport.numWheels > 2; 
      } 
     */ 
     public boolean isDriveable(ITransport transport) 
     { 

     } 
}

來源

2013-12-12 user3093257

讓我先說我有發的背景下，以戰略沒有問題，IMO個人策略的點開始是抽象掉的細節，所以你可以隨心所欲的另一插頭。 IStrategy接口方法允許用戶類爲所有策略執行相同的命令，但我不會將策略本身限制爲接口方法。個人戰略應該對上下文有深入的瞭解。請讓我知道如果我完全錯過了你的觀點，如果有人有不同的意見，我會非常感興趣。

在你的例子中，MotorcycleDriveableStrategy是我們唯一應該對摩托車駕駛性能做出決定的地方。因此：

public class MotorcycleDriveableStrategy : IDriveableStrategy 
{ 
    //What i would like to do 
    public bool IsDriveable(ITransport transport) 
    { 
     var mc = transport as Motorcycle; 
     if (mc == null) return false; 
     return mc.NumWheels > 2; 
    } 
}

如果你有興趣在整個事情：

public interface ITransport { bool Driveable();} 
public interface IDriveableStrategy { bool IsDriveable(ITransport transport);} 

public class Car : ITransport 
{ 
    private IDriveableStrategy Strategy { get; set; } 
    public bool Driveable() 
    { 
     return Strategy.IsDriveable(this); 
    } 
} 

public class Motorcycle : ITransport 
{ 
    private IDriveableStrategy Strategy { get; set; } 
    public int NumWheels { get; set; } 
    public string WeatherExceptions { get; set; } 

    public Motorcycle(IDriveableStrategy driveableStrategy, int numWheels, string weatherExceptions) 
    { 
     Strategy = driveableStrategy; 
     NumWheels = numWheels; 
     WeatherExceptions = weatherExceptions; 
    } 

    public bool Driveable() 
    { 
     return Strategy.IsDriveable(this); 
    } 
} 

public class MotorcycleDriveableStrategy : IDriveableStrategy 
{ 
    //What i would like to do 
    public bool IsDriveable(ITransport transport) 
    { 
     var mc = transport as Motorcycle; 
     if (mc == null) return false; 
     return mc.NumWheels > 2; 
    } 
} 

// And for the Car strategy 
public class CarDriveableStrategy : IDriveableStrategy 
{ 
    //place ur implementation here ... 
    public bool IsDriveable(ITransport transport) {return true;} 
} 

public class TestMotorcycle 
{ 
    public TestMotorcycle() 
    { 
     var mcs = new MotorcycleDriveableStrategy(); 
     var mc = new Motorcycle(mcs, 2, "abc"); 
     Console.WriteLine("Motorcycle is {0}drivable", mc.Driveable()?"":"not "); 
    } 
}

來源

2013-12-12 13:52:19 narendra

採取其他接口的策略模式方法

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