显示接口成员

如下面的IDrivable和IStreerable都声明了TurnLeft()方法

public interface IDrivable

{

　　void TurnLeft();

}

public interface IStreerable

{

　　void TurnLeft();

}

如果声明一个类实现这两个接口，在类中必须定义两个TurnLeft()方法，如何区别这两个方法呢？答案是：必须显示声明这个方法属于哪个接口，如下例：

    1 
   /*
   

    2 
    Example8_7.cs illustrates an explicit interface member

    3 
    implementation

    4 
    
   */
   

    5 
   

    6 
    
   using
    System;

    7 
   

    8 
   

    9 
   
   //
    define the IDrivable interface
   

   10 
   
   public
    
   interface
    IDrivable

   11 
   {

   12 
    
   void
    TurnLeft();

   13 
   }

   14 
   

   15 
   

   16 
   
   //
    define the ISteerable interface
   

   17 
   
   public
    
   interface
    ISteerable

   18 
   {

   19 
    
   void
    TurnLeft();

   20 
   }

   21 
   

   22 
   
   //
    Car class implements the IMovable interface
   

   23 
   
   public
    
   class
    Car : IDrivable, ISteerable

   24 
   {

   25 
   

   26 
    
   //
    explicitly implement the TurnLeft() method of the IDrivable interface
   

   27 
   
    
   void
    IDrivable.TurnLeft()

   28 
    {

   29 
    Console.WriteLine(
   "
   IDrivable implementation of TurnLeft()
   "
   );

   30 
    }

   31 
   

   32 
    
   //
    implement the TurnLeft() method of the ISteerable interface
   

   33 
   
    
   public
    
   void
    TurnLeft()

   34 
    {

   35 
    Console.WriteLine(
   "
   ISteerable implementation of TurnLeft()
   "
   );

   36 
    }

   37 
   

   38 
   }

   39 
   

   40 
   

   41 
   
   class
    Example8_7

   42 
   {

   43 
   

   44 
    
   public
    
   static
    
   void
    Main()

   45 
    {

   46 
   

   47 
    
   //
    create a Car object
   

   48 
   
    Car myCar 
   =
    
   new
    Car();

   49 
   

   50 
    
   //
    call myCar.TurnLeft()
   

   51 
   
    Console.WriteLine(
   "
   Calling myCar.TurnLeft()
   "
   );

   52 
    myCar.TurnLeft();

   53 
   

   54 
    
   //
    cast myCar to IDrivable
   

   55 
   
    IDrivable myDrivable 
   =
    myCar 
   as
    IDrivable;

   56 
    Console.WriteLine(
   "
   Calling myDrivable.TurnLeft()
   "
   );

   57 
    myDrivable.TurnLeft();

   58 
   

   59 
    
   //
    cast myCar to ISteerable
   

   60 
   
    ISteerable mySteerable 
   =
    myCar 
   as
    ISteerable;

   61 
    Console.WriteLine(
   "
   Calling mySteerable.TurnLeft()
   "
   );

   62 
    mySteerable.TurnLeft();

   63 
   

   64 
    }

   65 
   

   66 
   }