public class student
    {
        //构造函数
        public student(int _number, string _name, bool _sex)
        {
            Number = _number;
            Name = _name;
            Sex = _sex;
        }
        public int Number { get; set; }
        public string Name { get; set; }
        public bool Sex { get; set; }

        public override string ToString()
        {
            return string.Format("序号：{0},姓名：{1}，性别：{2}", Number.ToString(), Name, Sex ? "男" : "女");
        }

    }

 List<student> Students = new List<student>();
        private void Form1_Load(object sender,EventArgs e)
        {
            Students.Add(new student(1, "张一", true));
            Students.Add(new student(3, "张二", false));
            Students.Add(new student(5, "张三", true));
            Students.Add(new student(2, "张四", false));
            Students.Add(new student(4, "张五", true));
            Students.Add(new student(6, "张六", false));
        }

       
        private void showList(List<student> _list)
        {
            foreach(var item in _list)
            {
                richTextBox1.Text += item.ToString() + "\r\n";
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            richTextBox1.Text += "**原始显示:\r\n";
            showList(Students);

            richTextBox1.Text += "\r\n**用序号排序从小到大显示:\r\n";
            Students.Sort((x, y) => x.Number < y.Number ? -1 : 0);
            showList(Students);

            richTextBox1.Text += "\r\n**用序号排序从大到小显示:\r\n";
            Students.Sort((x, y) => x.Number > y.Number ? -1 : 0);
            showList(Students);

            richTextBox1.Text += "\r\n**用姓名排序(升序)显示:\r\n";
            Students.Sort((x, y) => x.Name.CompareTo(y.Name));
            showList(Students);

            richTextBox1.Text += "\r\n**用姓名排序(降序)显示:\r\n";
            Students.Sort((x, y) => y.Name.CompareTo(x.Name));
            showList(Students);

            richTextBox1.Text += "\r\n**用性别排序(升序)显示:\r\n";
            Students.Sort((x, y) => x.Sex.CompareTo(y.Sex));
            showList(Students);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            richTextBox1.Text += "\r\n**找出Name=\"张四\"的学生:\r\n";
            richTextBox1.Text += Students.Find((student s) => s.Name == "张四").ToString();

            richTextBox1.Text += "\r\n\r\n**找出第一个男学生:";
            richTextBox1.Text += "(该方法只会找到第一个就停止)\r\n";
            richTextBox1.Text += Students.Find((student s) => s.Sex == true).ToString();

            richTextBox1.Text += "\r\n\r\n**找出所有女学生:\r\n";
            showList(Students.FindAll((student s) => s.Sex == false));

            richTextBox1.Text += "\r\n\r\n**判断“张四”学生是否存在:\r\n";
            richTextBox1.Text += Students.Exists((student s) => s.Name == "张四" ? true : false).ToString();
        }