一、场景
请你写出linq对表格排序，CODE=3排前面，其余按照CODE降序排序，CODE一样再按照字母升序排序
| ID | CODE | VALUE |
| A0001 | 1 | A |
| A0002 | 1 | B |
| A0003 | 1 | C |
| A0004 | 2 | D |
| A0005 | 2 | E |
| A0006 | 2 | F |
| A0007 | 3 | G |
| A0008 | 3 | H |
| A0009 | 3 | I |
| A0010 | 4 | J |
二、代码
using System;
using System.Collections.Generic;
using System.Linq;class SortingDemo
{static void Main(){// 创建数据源var data = new[]{new { ID = "A0001", CODE = 1, VALUE = "A" },new { ID = "A0002", CODE = 1, VALUE = "B" },new { ID = "A0003", CODE = 1, VALUE = "C" },new { ID = "A0004", CODE = 2, VALUE = "D" },new { ID = "A0005", CODE = 2, VALUE = "E" },new { ID = "A0006", CODE = 2, VALUE = "F" },new { ID = "A0007", CODE = 3, VALUE = "G" },new { ID = "A0008", CODE = 3, VALUE = "H" },new { ID = "A0009", CODE = 3, VALUE = "I" },new { ID = "A0010", CODE = 4, VALUE = "J" }};// 使用LINQ进行排序var sortedData = data.OrderByDescending(item => item.CODE == 3).ThenByDescending(item => item.CODE).ThenBy(item => item.VALUE).ToList();// 输出排序结果foreach (var item in sortedData){Console.WriteLine($"ID: {item.ID}, CODE: {item.CODE}, VALUE: {item.VALUE}");}}
}
三、结果
ID: A0007, CODE: 3, VALUE: G
ID: A0008, CODE: 3, VALUE: H
ID: A0009, CODE: 3, VALUE: I
ID: A0010, CODE: 4, VALUE: J
ID: A0004, CODE: 2, VALUE: D
ID: A0005, CODE: 2, VALUE: E
ID: A0006, CODE: 2, VALUE: F
ID: A0001, CODE: 1, VALUE: A
ID: A0002, CODE: 1, VALUE: B
ID: A0003, CODE: 1, VALUE: C四、思考
若再加大难度，ID=A0005的排第一，然后CODE=3排前面，其余按照CODE降序排序，再按照字母升序排序，如何写呢？
var sortedData = data.OrderByDescending(item=>item.ID=="A0005").ThenByDescending(item => item.CODE == 3).ThenByDescending(item => item.CODE).ThenBy(item => item.VALUE).ToList();
)
