使用转换运算符

http://msdn.microsoft.com/zh-cn/library/85w54y0a(VS.80).aspx

 

 

代码

   
     

    
      
    
      //
    
      卡车
    
      

    
       
    
      class
    
       Truck
 {
 
    
      public
    
       Truck()
 {
 Desc 
    
      =
    
       
    
      "
    
      卡车
    
      "
    
      ;
 }

 
    
      string
    
       _desc;

 
    
      public
    
       
    
      string
    
       Desc
 {
 
    
      get
    
       { 
    
      return
    
       _desc; }
 
    
      set
    
       { _desc 
    
      =
    
       value; }
 }

 
    
      public
    
       
    
      static
    
       
    
      explicit
    
       
    
      operator
    
       Truck(Car c)
 {
 Truck t 
    
      =
    
       
    
      new
    
       Truck();
 t.Desc 
    
      =
    
       c.Desc;
 
    
      return
    
       t;
 }

 }

 
    
      //
    
      轿车
    
      

    
       
    
      class
    
       Car
 {
 
    
      public
    
       Car()
 {
 Desc 
    
      =
    
       
    
      "
    
      轿车
    
      "
    
      ;
 }

 
    
      string
    
       _desc;

 
    
      public
    
       
    
      string
    
       Desc
 {
 
    
      get
    
       { 
    
      return
    
       _desc; }
 
    
      set
    
       { _desc 
    
      =
    
       value; }
 }

 
    
      public
    
       
    
      static
    
       
    
      implicit
    
       
    
      operator
    
       Car(Truck t)
 {
 Car c 
    
      =
    
       
    
      new
    
       Car();
 c.Desc 
    
      =
    
       t.Desc;
 
    
      return
    
       c;
 }
 }


    
      //
    
      调用
    
      

    
      class
    
       Program
 {
 
    
      static
    
       
    
      void
    
       Main(
    
      string
    
      [] args)
 {
 Truck t 
    
      =
    
       
    
      new
    
       Truck();
 Car c 
    
      =
    
       
    
      new
    
       Car();
 Console.WriteLine(
    
      "
    
      Truck:
    
      "
    
       
    
      +
    
       t.Desc);
 Console.WriteLine(
    
      "
    
      Car:
    
      "
    
       
    
      +
    
       c.Desc);

 Console.WriteLine(
    
      "
    
      explicit and implicit
    
      "
    
      );

 Truck t1 
    
      =
    
       (Truck)c;
 Car c1 
    
      =
    
       t;
 Console.WriteLine(
    
      "
    
      Truck:
    
      "
    
       
    
      +
    
       t1.Desc);
 Console.WriteLine(
    
      "
    
      Car:
    
      "
    
       
    
      +
    
       c1.Desc);
 }
 }