一个初学者的问题，大家帮助一下啦！

Question

怎么知道对象有IPassengerCarrier接口？？object obj;//这个Object是你获得的对象if( obj is IPassengerCarrier )
  //对象实现了IPassengerCarrier接口

Answer 1

public class Traffic
{
   public static void Main( string[] args )
   {
        object obj;
        
        obj = new Car();
        AddPassenger( obj );        obj = new Compact();
        AddPassenger( obj );        obj = new PickUp();
        AddPassenger( obj );        obj = new SUV();
        AddPassenger( obj );        obj = new Train();
        AddPassenger( obj );        obj = new PassengerTrain();
        AddPassenger( obj );        obj = new FrelghtTrain();
        AddPassenger( obj );        obj = new DoubleBoger();
        AddPassenger( obj );
   }
   
   public static void AddPassenger( object obj )
   {
      if( obj is IPassengerCarrier )
         Console.WriteLine( obj.ToString() );
   }
}