[C#]List的Sort()、Find()、FindAll()、Exist()的使用方法举例
[转]http://www.cnblogs.com/dooroo/archive/2012/12/11/2813858.html
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(); }
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