[C#]List的Sort()、Find()、FindAll()、Exist()的使用方法举例

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本文介绍了一个C#实现的学生信息列表的排序和查找方法，包括按序号、姓名、性别进行升序和降序排序，并展示了如何使用Find、FindAll及Exists方法查找特定条件的学生。

转载自：http://www.cnblogs.com/dooroo/archive/2012/12/11/2813858.html

先建一个学生类：

 
   
  
        public class student
        {
            public int Number { get; set; }
            public string Name { get; set; }
            public bool Sex { get; set; }
            public student(int _number, string _name, bool _sex)
            {
                Number = _number;
                Name = _name;
                Sex = _sex;
            }
            public override string ToString()
            {
                return string.Format("序号:{0},姓名:{1},性别:{2}",
                    Number.ToString(), Name, Sex ? "男" : "女");
            }
        } 
   
  

例程代码如下：

 
   
  
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace ListSortTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        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));
        }
        //排序按钮
        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 showList(List<student> _list)
        {
            for (int i = 0; i < _list.Count; i++)
            {
                richTextBox1.Text += _list[i].ToString() + "\r\n";
            }
        }

        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();

        }
    }
} 
   
  