C#系列教程——装箱取消转换

using System;
class Unboxing_Test
{
    static void Main()
    {
        int i = 100;
        object o = i;  // 装箱
        try
        {
            int j = (short)o;  // 取消装箱            
            System.Console.WriteLine("取消装箱成功.");
        }
        catch (System.InvalidCastException e)
        {
            System.Console.WriteLine("{0} 取消装箱异常.", e.Message);
        }
    }
}