namespace WebApplication1

{ 



    static class Extensions

    {

        internal static bool stuEquals(this Student x, Student y)

        {

            if (x.Age == y.Age && x.Stature == y.Stature)

            {

                return true;

            }

            else

            {

                return false;

            }

        }

        internal static bool ContainsStu(this List<Student> list, Student stu)

        {

            bool isContains = false;

            foreach (Student s in list)

            {

                if (s.stuEquals(stu))

                {

                    isContains = true;

                    break;

                }

            }

            return isContains;

        }

    }

    public class Student

    {





        public Student(int age, double stature)

        {

            this._age = age;

            this._stature = stature;

        }



        private int _age;

        /// <summary>

        /// 年龄

        /// </summary>

        public int Age

        {

            get { return _age; }

            set { _age = value; }

        }



        private double _stature;

        /// <summary>

        /// 身高

        /// </summary>

        public double Stature

        {

            get { return _stature; }

            set { _stature = value; }

        }



    }

    public partial class CSSTest : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            List<Student> students = new List<Student>();

            Student stu1 = new Student(17, 170);

            students.Add(stu1);

            Student stu2 = new Student(18, 180);

            students.Add(stu2);

            Student stu3 = new Student(17, 170);

            students.Add(stu3);

            Student stu4 = new Student(18, 170);

            students.Add(stu4);

            Student stu5 = new Student(19, 190);

            students.Add(stu5);

            Student stu6 = new Student(22, 186);

            students.Add(stu6);



            List<Student> Newstudents = new List<Student>();

            foreach (Student stu in students)

            {

                if (!Newstudents.ContainsStu(stu))

                {

                    Newstudents.Add(stu);

                }

            }



           



        }

    }

}

 static List<Student> GetDifferent(List<Student> ss)

        {

            List<Student> newStudent = new List<Student>();

            for (int i = 0; i < ss.Count; i++)

            {

                if (!newStudent.Contains(ss[i]))

                {

                    newStudent.Add(ss[i]);

                }

            }

            return newStudent;

        }

public class Student

{

	public uint Age { get; set; }

	public double Stature { get; set; }



	public Student(uint age, double stature)

	{

		this.Age = age;

		this.Stature = stature;

	}

}



// Form_Load 测试代码

List<Student> students = new List<Student>();

students.Add(new Student(5, 5d));

students.Add(new Student(51, 3d));

students.Add(new Student(5, 5d));

students.Add(new Student(5, 5d));

students.Add(new Student(23, 5d));

students.Add(new Student(43, 25d));



List<Student> copy = new List<Student>();



//// 默认 Contains 方法无法甄别重复项目

//foreach(Student item in students)

//{

//    if (copy.Contains(item)) continue;

//    else copy.Add(item);

//}



// 根据7楼的提议，弄了个偷懒的法子

Dictionary<uint, double> dic = new Dictionary<uint, double>();



foreach(Student student in students)

{

	if(!dic.ContainsKey(student.Age))

	{

		dic.Add(student.Age, student.Stature);

		copy.Add(student);

		continue;

	}

	if(!dic.ContainsValue(student.Stature))

	{

		dic.Add(student.Age, student.Stature);

		copy.Add(student);

		continue;

	}

}



Console.WriteLine("Count: {0}", copy.Count);



// 输出 Count: 4