复习整理

    #region 多态继承
    public abstract class animal
    {
        public    void Eat()
        {
            Console.WriteLine("animal Eat");
        }
        public virtual void Call()
        {
            Console.WriteLine("animal Call");
        }
        public abstract void live();
    }
    public class cat : animal
    {
        public override void Call()
        {
            Console.WriteLine("cat Call");
        }
        public override void live()
        {
            Console.WriteLine("the cat is live");
        }
    }
    public class dog : animal
    {
        public     void Eat()
        {
            Console.WriteLine("dog Eat");
        }
        public override void live()
        {
            Console.WriteLine("the dog is live");
        }
    }

    #endregion

多态。。

重写，重载，abstract,override,virtual

abstract :无实体函数，子类必须实现

virtual：有实体函数，子类可以不实现，如果实现实为覆盖;

如果不标注virtual的函数被子类实现了，那么子类的函数与父类并存，且实现的时候不需要加override修饰

    #region 多态继承
    public abstract class animal
    {
        public    void Eat()
        {
            Console.WriteLine("animal Eat");
        }
        public virtual void Call()
        {
            Console.WriteLine("animal Call");
        }
    }
    public class cat : animal
    {
        public override void Call()
        {
            Console.WriteLine("cat Call");
        }
    }
    public class dog : animal
    {
        public     void Eat()
        {
            Console.WriteLine("dog Eat");
        }
    }

    #endregion

这个代码是.NET传参数的方式，ref,out,params

REF：传参数前先赋值

OUT：返回前必须赋值

params:无限制的传参数，随便多少个都无所谓

    public class CloneString : ICloneable
    { 
        public int intI = 1234;
        public Car aCar = new Car();
        public object Clone()
        {
            CloneString cs= new CloneString(); 
            cs.intI = intI;
            cs.aCar.CarName = aCar.CarName;
            cs.aCar.CarNum = aCar.CarNum;
            return cs;
        }
        public object MemberwishClone()
        {
            return base.MemberwiseClone();
        }
        public override string ToString()
        {
            return "CarNum:" + aCar.CarNum + "aCar.CarName:" + aCar.CarName;
        }
    }

    public class Car
    {
        public string CarName = "hongqi";
        public int CarNum =  10010 ;
    
    }

深复制。复制引用类型和值类型

  //这个类测试属性
    public class student
    {
        protected string _name = "";
        public string Name
        {
            set { _name = value; }
            get
            {
                if (_name == "wsenmin") return _name + " you are best student!";
                else return _name + " you are not wsenmin !";
            }
        }
    }

属性，方便代码扩展，让字段不暴露

    public class people
    {
        protected string _name = "";
        protected int _age = 0;

        public people(string name, int age)
        {
            Name = name;
            Age = age;
        }
        public string Name
        {
            set { _name = value; }
            get
            {
                return _name;
            }
        }
        public int Age
        {
            set { _age = value; }
            get
            {
                return _age;
            }
        }
        public string SayHello()
        {
            return Name + "对你说 “你好”";
        }

    }
    /// <summary>
    /// 索引测试
    /// </summary> 
    public class PeopleS
    {

        people[] ps = new people[4];
        public PeopleS()
        {
            ps[0] = new people("a", 1);
            ps[1] = new people("b", 132);
            ps[2] = new people("c", 32);
            ps[3] = new people("wsenmin", 27);
        }

        public people this[int index]
        {
            get { return ps[index]; }
        }

        public people this[string name]
        {
            get
            {
                for (int i = 0; i < ps.Length; i++)
                {
                    if (name == ps[i].Name) { return ps[i]; }
                }
                return null;
            }
        }

    }

索引器，很简单的查找和匹配

using:类似于try catch finally ,自动调用dispose方法