c#中设置属性 索引 接口 泛型 抽象类 委托 事件

类中的属性

给私有变量增加属性public class Person{private string name="";public string Name{get {return name;}set {name=value;}}}//调用Person tp =new Person();tp.Name="zxl";this.textbox1.text=tp.Name;public class person{private string name="";public string Name{get {return name;}set {if(value.length >= 2)name=value;elsename="zxl";}}}

 c#中索引

 

public class Book{//成员变量public string temp="";//成员索引public string this [int index]{get { return temp; }set { temp= value; }}}Book tb = new Book();tb [0]="helloworld";this.textbox1.text=tb[0];

 扩展改写：

 

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace WindowsFormsApplication1{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void Form1_Load(object sender, EventArgs e)        {            telephoneList theTelephoneList = new telephoneList();            theTelephoneList.initialize();            this.textBox1.Text = theTelephoneList["张1"].ToString();            //this.textBox1.Text = theTelephoneList[12000];        }        public class Student        {            public string name;            public int ID;        }        public class telephoneList        {            private Student[] Students;            public void initialize()            {                Students = new Student[3];                Students[0] = new Student();                Students[0].name = "张1";                Students[0].ID = 11000;                Students[1] = new Student();                Students[1].name = "张2";                Students[1].ID = 12000;                Students[2] = new Student();                Students[2].name = "张3";                Students[2].ID = 13000;            }            public string this[int theID]            {                get                {                    Student stu = null;                    if (Students.Length > 0)                    {                        for (int i = 0; i < Students.Length; i++)                        {                            if (Students[i].ID == theID)                            {                                stu = Students[i];                                break;                            }                        }                    }                    return stu.name;                }            }            public int this[string theName]            {                get                {                    Student stu = null;                    if (Students.Length > 0)                    {                        for (int i = 0; i < Students.Length; i++)                        {                            if (Students[i].name == theName)                            {                                stu = Students[i];                                break;                            }                        }                    }                    return stu.ID;                }            }        }    }}

 接口：

 

        private void Form1_Load(object sender, EventArgs e)        {            Iface z = new Person();            z.ShowFace();        }        interface Iface {            void ShowFace();        }        class Person : Iface {            public void ShowFace() {                MessageBox.Show("zxl hello world !");            }        }

 

泛型：  泛型类：带有参数的"类" 这里的参数是指 类型

 

        private void Form1_Load(object sender, EventArgs e)        {            Test<string, int> z = new Test<string, int>("ZXL", 20);            z.SetValue();        }        public class Test<T, S> {            private T name;            private S age;            public Test(T Name, S Age) {                this.name = Name;                this.age = Age;            }            public void SetValue() {                MessageBox.Show("name is "+name.ToString());                MessageBox.Show("age is "+age.ToString());            }        } 

抽象类： 不能实例化! (不想让类被实例化 可以用抽象类)

 

        private void Form1_Load(object sender, EventArgs e)        {            //Person tp = new Person(); //不能实例化            Person ts = new Student();            ts.SayHello();            ts.a();        }        public abstract class Person {            public abstract void SayHello();            public void a() { MessageBox.Show("hello"); }        }        public class Student : Person {            public override void SayHello()            {                MessageBox.Show("override hello");            }        }

 委托：

 委托是一种类型 但是委托应以了方法的类型 可以吧方法做为参数进行传递成为可能

声明： public delegate void GreetingDelegate(string name);

        private void Form1_Load(object sender, EventArgs e)        {            //GreetPeople("zxl", EnglishGreeting); //传递英文的方法            //GreetPeople("张星星", ChineseGreeting); //传递中文的方法            //GreetingDelegate delegate1 = new GreetingDelegate(); 错误例子 委托实例是需要传递参数 方法                        //创建委托调用chinese            GreetingDelegate delegate1 = new GreetingDelegate(EnglishGreeting);            delegate1 = ChineseGreeting;            delegate1("张星星");            //委托连            //delegate1 += EnglishGreeting;            //delegate1 += ChineseGreeting;                    }        private void GreetPeople(string name,GreetingDelegate MakeGreeting) { //传入一个委托参数            MakeGreeting(name);        }        private void EnglishGreeting(string name) {            MessageBox.Show("Morning,"+name);        }        private void ChineseGreeting(string name){            MessageBox.Show("你好," + name);        }

 事件：热水器事件

 

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using Delegate; //引入 命名空间namespace WindowsFormsApplication1{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void Form1_Load(object sender, EventArgs e)        {            Heater heater = new Heater();            Alarm alarm = new Alarm();            Display display = new Display();            heater.BoilEvent += alarm.MakeAlert;//注册方法            heater.BoilEvent += alarm.MakeAlert;//注册方法            heater.BoilEvent += display.ShowMsg;//注册方法            heater.BoilWater(); //烧水，温度懂啊99时触发        }            }}namespace Delegate {    //热水器类    public class Heater {        private int temperature = 0; //声明成员变量        public delegate void BoilHandler(int param); //声明委托        public event BoilHandler BoilEvent;        //烧水方法        public void BoilWater() {            for (int i = 1; i <= 100; i++) {                temperature++;                if (temperature >= 99 && BoilEvent != null) {                    BoilEvent(temperature); //调用注册方法                }            }        }    }    //报警器类    public class Alarm {        public void MakeAlert(int param) {            MessageBox.Show("水开了 温度为："+param.ToString());        }    }    //显示器类    public class Display{        public void ShowMsg(int param) {            MessageBox.Show("显示当前温度："+param.ToString());        }    }}