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

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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

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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 ;

    

    }

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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 !";

            }

        }

    }

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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;

            }

        }



    }

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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