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：

/*
  Example8_7.cs illustrates an explicit interface member
  implementation
 */

 using System;


// define the IDrivable interface
public interface IDrivable
{
  void TurnLeft();
}


// define the ISteerable interface
public interface ISteerable
{
  void TurnLeft();
}

// Car class implements the IMovable interface
public class Car : IDrivable, ISteerable
{

  // explicitly implement the TurnLeft() method of the IDrivable interface
  void IDrivable.TurnLeft()
  {
    Console.WriteLine("IDrivable implementation of TurnLeft()");
  }

  // implement the TurnLeft() method of the ISteerable interface
  public void TurnLeft()
  {
    Console.WriteLine("ISteerable implementation of TurnLeft()");
  }

}


class Example8_7
{

  public static void Main()
  {

    // create a Car object
    Car myCar = new Car();

    // call myCar.TurnLeft()
    Console.WriteLine("Calling myCar.TurnLeft()");
    myCar.TurnLeft();

    // cast myCar to IDrivable
    IDrivable myDrivable = myCar as IDrivable;
    Console.WriteLine("Calling myDrivable.TurnLeft()");
    myDrivable.TurnLeft();

    // cast myCar to ISteerable
    ISteerable mySteerable = myCar as ISteerable;
    Console.WriteLine("Calling mySteerable.TurnLeft()");
    mySteerable.TurnLeft();

  }

}