program.cs

这是.net2005学习不可缺少的教程

// cs_readonly_keyword.cs
// Readonly fields
using System;
public class ReadOnlyTest
{
    class SampleClass
    {
        public int x;
        // Initialize a readonly field
        public readonly int y = 25;
        public readonly int z;

        public SampleClass()
        {
            // Initialize a readonly instance field
            z = 24;
        }

        public SampleClass(int p1, int p2, int p3)
        {
            x = p1;
            y = p2;
            z = p3;
        }
    }

    static void Main()
    {
        SampleClass p1 = new SampleClass(11, 21, 32);   // OK
        Console.WriteLine("p1: x={0}, y={1}, z={2}", p1.x, p1.y, p1.z);
        SampleClass p2 = new SampleClass();
        p2.x = 55;   // OK
        Console.WriteLine("p2: x={0}, y={1}, z={2}", p2.x, p2.y, p2.z);
    }
}