C#泛型之List操作示例

来源：互联网发布：recorder.js 编辑：程序博客网时间：2024/06/06 09:19

转自：http://blog.itpub.net/12639172/viewspace-478294/

private void button1_Click(object sender, EventArgs e)        {            label1.Text = "";            /*            ArrayList AL = new ArrayList(3);            TestData temp = new TestData(1);            AL.Add(temp);            AL.Add(new TestData(2));            AL.Add(new TestData(3));            foreach (TestData item in AL)            {                label1.Text += item.Val.ToString() + "   ";                item.Val += 1;            }            foreach (TestData item in AL)            {                label1.Text += item.Val.ToString() + "   ";            }             */            List racers;            List racers2;            FindRacer finder;            //--------------------------------------------------------------------------------            //生成泛型对象            racers = new List();            racers.Add(new Racer("M J", "L"));            racers.Add(new Racer("AD3 R", "OK3"));            racers.Add(new Racer("M2 O", "L2"));            racers.Add(new Racer("AD2 Q", "OK2"));            racers.Add(new Racer("M1 W", "L"));            racers.Add(new Racer("AD4 A", "OK4"));            racers.Add(new Racer("AD1 L", "OK1"));                        //跌代显示泛型对象所有元素            label1.Text += "\n跌代显示泛型对象所有元素\n";            foreach (Racer item in racers)            {                label1.Text += item.ToString() + "   ";            }            //--------------------------------------------------------------------------------            /*            List查找对象:Preadcate是一个委托,它引用一个谓词方法.            public T Find match);            public List FindAll match);            */            //委托查找所有满足条件的元素            label1.Text += "\nFindAll(Car==\"L\")\n";            finder = new FindRacer("L");            foreach(Racer item in racers.FindAll(new Predicate(finder.DrivingCarPredicate)))                 {                label1.Text += item.ToString() + "   ";            }            label1.Text += "\nFindAll(Car==\"L\")将结果赋给其它泛型对象\n";            racers2 = racers.FindAll(new Predicate(finder.DrivingCarPredicate));//返回泛型对象            foreach (Racer item in racers2)            {                label1.Text += item.ToString() + "   ";            }            //委托查找一个元素(找到的第一个元素)            label1.Text += "\nFind(Car==\"L\")\n";            finder = new FindRacer("L2");            label1.Text += racers.Find(new Predicate(finder.DrivingCarPredicate)).ToString();            //将查找出的元素做修改            racers.Find(new Predicate(finder.DrivingCarPredicate)).Car = "L";            label1.Text += "\n将查找出元素修改过后\n";            finder = new FindRacer("L");            foreach (Racer item in racers.FindAll(new Predicate(finder.DrivingCarPredicate)))            {                label1.Text += item.ToString() + "   ";            }            //--------------------------------------------------------------------------------            /*            List.ForEach()可以用于对每个元素执行一些操作.            它使用Action委托对集合中的每个元素执行操作.Action委托返回的类型是void.            */            racers.ForEach(delegate(Racer r) { r.Car += "_CAR"; });            label1.Text += "\nList.ForEach()全部修改对象\n";            foreach (Racer item in racers)            {                label1.Text += item.ToString() + "   ";            }            //--------------------------------------------------------------------------------            /*            List.Sort对元素进行排序            */            //public void List.Sort(Comparison), 是一个委托方法,该方法带两个T类型参数;            racers.Sort(delegate(Racer r1, Racer r2) { return r1.Car.CompareTo(r2.Car); });            label1.Text += "\n 排序public void List.Sort(Comparison)\n";            foreach (Racer item in racers)            {                label1.Text += item.ToString() + "   ";            }            //public void List.Sort(IComparer)            racers.Sort(new RacerComparer(RacerComparer.CompareType.Name));            label1.Text += "\n 排序public void List.Sort(IComparer)\n";            foreach (Racer item in racers)            {                label1.Text += item.ToString() + "   ";            }            //--------------------------------------------------------------------------------            /*            类型转换             */            List persons = racers.ConvertAll(delegate(Racer r)            {                int ixSeparator = r.Name.LastIndexOf(' ') + 1;                string lastname = r.Name.Substring(ixSeparator, r.Name.Length - ixSeparator);                string firstname = r.Name.Substring(0, ixSeparator - 1);                return(new Person(firstname, lastname));            });            label1.Text += "\n List.ConvertAll类型转换\n";            foreach (Person item in persons)            {                label1.Text += item.ToString() + "   ";            }            label1.Text += "\n 类型转换后的源数据\n";            foreach (Racer item in racers)            {                label1.Text += item.ToString() + "   ";            }            //--------------------------------------------------------------------------------        }//--------------------------------------------------------------------------------    //实体类    class Racer    {        private string name;        public string Name        {            get            {                return (name);            }        }        private string car;        public string Car        {            get            {                return (car);            }            set            {                car = value;            }        }        public Racer(string name, string car)        {            this.name = name;            this.car = car;        }        public override string ToString()        {           return name + "," + car;        }    }    //--------------------------------------------------------------------------------    //查找类    class FindRacer    {        private string car;        public FindRacer(string car)        {            this.car = car;        }        public bool DrivingCarPredicate(Racer racer)        {            return (racer.Car == car);        }    }    //排序类    class RacerComparer : IComparer    {        public enum CompareType        {            Name, Car        }        private CompareType compareType;        public RacerComparer(CompareType compareType)        {            this.compareType = compareType;        }        public int Compare(Racer x, Racer y)        {            int result = 0;            switch (compareType)            {                case CompareType.Name:                    {                        result = x.Name.CompareTo(y.Name);                        break;                    }                case CompareType.Car:                    {                        result = x.Car.CompareTo(x.Car);                        break;                    }            }            return (result);        }    }    //--------------------------------------------------------------------------------    //类型转换类    public class Person    {        private string firstname;        private string lastname;        public Person(string firstname, string lastname)        {            this.firstname = firstname;            this.lastname = lastname;        }        public override string ToString()        {            return (firstname + "." + lastname);        }    }

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