装箱 Boxing

最新推荐文章于 2025-03-25 22:14:51 发布

原创最新推荐文章于 2025-03-25 22:14:51 发布 · 564 阅读

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#object #class #string

using System;

namespace testBoxingApp
{
/// <summary>
/// Class1 的摘要说明。
/// </summary>
class Class1
{
  /// <summary>
  /// 应用程序的主入口点。
  /// </summary>
  [STAThread]
  static void Main(string[] args)
  {
   //
   // TODO: 在此处添加代码以启动应用程序
   //

   short i = 1;
   object ObjectOne = i; //装箱，隐式类型转换
   Console.WriteLine ("{0} Boxing to object:{1}",ObjectOne.GetType(),ObjectOne);
   short j;
   j = (short)ObjectOne; //拆箱，显示类型转换
   Console.WriteLine ("object Unboxing to short :{0}",j);

   try      //错误的拆箱
   {
                int k;
                k = (int)ObjectOne;
    Console.WriteLine ("object Unboxing to int: {0}",k);
   }
   catch(InvalidCastException ex){
    Console.WriteLine ( ex.Message );
   }

   object ObjectTwo = new Class2 ();
   try      //错误的拆箱
   {
    short m;
    m = (short)ObjectTwo;
    Console.WriteLine ("object Unboxing to short :{0}",m);
   }
   catch(InvalidCastException ex)
   {
    Console.WriteLine ( ex.Message );
   }

   Class2 aRef;   //Class2的一个引用变量
   aRef = (Class2) ObjectTwo;
   Console.WriteLine (aRef.s );
  }
}

class Class2
{
  public short s;
  public Class2()
  {
   Console.WriteLine ("A Class2 Object!");
   s = 10;
  }
}
}