C#其他

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摘自：C#入门经典第10章
C#属性块

//---------Student.csusing System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace First{    public class Student    {        public readonly string name;        private double  score;        public Student(string name)        {            this.name = name;            score = 0;               }        public override string ToString()        {            return "[名字：" + this.name + "--分数：" + this.score + "]";        }        public double stuScore        {             get            {                return score;            }            set            {                if (value >= 0 && value <= 100)                    score = value;                else                    throw new ArgumentOutOfRangeException("stuScore",value,"stuScore must be assigned a value between 0 and 100!");                 }         }    }}

//----------Program.csusing System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace First{    class Program    {        static void Main(string[] args)        {            Console.WriteLine("新建学生...");            /*  //ERROR            String[] nameList = new String[20];            nameList={"a","b","c"};              */            string[] nameList={"张三","李四","王五"};            Student[] stu=new Student [3];            stu[0] = new Student(nameList[0]);            stu[1] = new Student(nameList[1]);            stu[2] = new Student(nameList[2]);            Console.WriteLine("stu 新建完成...");            foreach(Student s in stu )                try                {                    Console.WriteLine("--------------------------");                    Console.WriteLine("请给下面学生输入分数："+s.name);                    double inputScore = Convert.ToDouble(Console.ReadLine());                    s.stuScore = inputScore;                    Console.WriteLine("设置分数成功！");                }                catch (Exception e)                {                    //Console.WriteLine("输入分数不符合要求！");                                   }            Console.WriteLine("输出学生信息：");            foreach (Student s in stu)                Console.WriteLine(s);            Console.ReadKey();        }    }}

摘自：C#入门经典第13章

C#委托和事件

//----------Connection.csusing System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Timers;namespace Second{    //在名字空间声明一个委托.    public delegate void MessageHandler(string message);       public class Connection    {        /*         * 在类中声明一个事件，且用关键字event修饰         * public  event       MessageHandler      MessageArrived;         *         关键字      委托（事件的类型）   事件         */        public event MessageHandler MessageArrived;        private Timer pollTimer;        public Connection()        {            /*             * 1.建立对象（这个对象可以引发事件Elapsed）             * 2.订阅事件（采用显/隐式委托+=。这里的委托指ElapsedEventHandler，匹配方法是CheckMessage）             * 3.开启线程（当引发事件后，就通知订阅器，转到相应的处理方法中去）             * 注：在下面主线程中可以看到事件的嵌套             */            pollTimer = new Timer(100);            pollTimer.Elapsed += new ElapsedEventHandler(CheckMessage);                }        public void Connect()        {            pollTimer.Start();        }        public void Disconnect()        {            pollTimer.Stop();        }        /*         * 定义一个Random实例，生成0-9之间的随机数         * 定义一个匹配方法CheckMessage，该方法与委托名具有相同的返回类型和形参         * MessageArrived != null含义是：事件是否有订阅者？如果为null表示没有订阅，从而也就不会被引发         * MessageArrived("Hello C sharp!");表示委托，由相应的匹配事件处理         * 解释：见主函数         */        private static Random random = new Random();        private void CheckMessage(object source,ElapsedEventArgs e)        {            Console.WriteLine("Checking for new messages:");            if ((random.Next(9) == 0) && (MessageArrived != null))                MessageArrived("Hello C sharp!");            }    }}

//----------Display.csusing System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Second{    public class Display    {        public void DisplayMessage(string message)        {            Console.WriteLine("Message arrived:"+message );        }    }}

//-------------Program.csusing System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Second{    class Program    {        static void Main(string[] args)        {            Connection myConnection = new Connection();            Display myDisplay = new Display();            /*             * 事件触发者：Connection，事件触发对象：myConnection             * 事件：MessageArrived，事件委托：MessageHandler             *              * 事件订阅者：Display，事件订阅对象：myDisplay             * 匹配方法：DisplayMessage，用来响应MessageArrived事件              */            myConnection.MessageArrived += new MessageHandler(myDisplay.DisplayMessage);            myConnection.Connect();            Console.ReadKey();            Console.ReadKey();        }    }}

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