class1.cs

来自「Csharp实例编程百例.rar」· CS 代码 · 共 65 行

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;
		}
	}
}