readonly.cs

深入浅出C＃,学习C#比较好的用例,能够很快掌握C#.

using System;
public class ReadOnlyTest 
{
	class MyClass 
	{
		public static readonly MyClass p=new MyClass(44,55,66);
		public int x;
		public readonly int y = 2; //初始化只读域
		public readonly int z;

		public MyClass() 
		{
			z = 3;   //初始化只读域
		}

		public MyClass(int p1, int p2, int p3) 
		{
			x = p1; 
			y = p2;  //初始化只读域
			z = p3; //初始化只读域
		}
	}

	public static void Main() 
	{
		Console.WriteLine("MyClass.p is of readonly.");
		Console.WriteLine("p:x={0},y={1},z={2}",MyClass.p.x,MyClass.p.y,MyClass.p.z);
		MyClass myclass= new MyClass(11, 22, 33);  
		Console.WriteLine("myclass: x={0}, y={1}, z={2}" , myclass.x, myclass.y, myclass.z);   
		Console.WriteLine("y and z are of readonly,you can not change their values.");
		Console.Write("x is not of readonly,do you want to change its value?1=y,2=no:");
		string ch=Console.ReadLine();
		int choose=int.Parse(ch);
		if(choose==1)
		{
			Console.Write("please input the new value:");
			string s=Console.ReadLine();
			int val=int.Parse(s);
			myclass.x=val;
		}
		Console.WriteLine("after changing......"); 
		Console.WriteLine("myclass: x={0}, y={1}, z={2}" , myclass.x, myclass.y, myclass.z);   
	}
}