C# 排序的多种实现方式(经典)
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排序是我们编程时的常用操作,实现方式也有很多种,本篇文章列举几种我常用的用法,希望对大家有用!
01
—
数组排序
最常见的排序是对一个数组排序,比如:
int[] aArray = new int[8] 18, 17, 21, 23, 11, 31, 27, 38 ;
第一种:我们最熟悉的冒泡排序法:即每个值都和它后面的数值比较,每次拿出最小值
static void Main(string[] args)
int[] aArray = new int[8] 18, 17, 21, 23, 11, 31, 27, 38 ;
for (int j = 0; j < aArray.Length - 1; j++)
for (int i = 0; i < aArray.Length - 1; i++)
if (aArray[i] > aArray[i + 1])
int temp = aArray[i];
aArray[i] = aArray[i + 1];
aArray[i + 1] = temp;
foreach (var a in aArray)
Console.Write($"a ");
Console.ReadKey();
运行结果:
第二种:利用Array.Sort排序:
① 升序排列:
static void Main(string[] args)
int[] aArray = new int[8] 18, 17, 21, 23, 11, 31, 27, 38 ;
Array.Sort(aArray);
foreach (var a in aArray)
Console.Write($"a ");
Console.ReadKey();
运行结果:
② 降序排列:先升序排列,然后对数组反转
static void Main(string[] args)
int[] aArray = new int[8] 18, 17, 21, 23, 11, 31, 27, 38 ;
Array.Sort(aArray);
Array.Reverse(aArray);
foreach (var a in aArray)
Console.Write($"a ");
Console.ReadKey();
运行结果:
02
—
List排序
大多数时候,我们需要将list集合里面的数据进行排序,
① 如果list直接放置的数值类型的数据就比较简单,比如:
List<int> aList = new List<int> 18, 17, 21, 23, 11, 31, 27, 38 ;
方法一:利用List<T> 自带的Sort排序方法
-. 升序排列:
aList.Sort();
降序排列:
aList.Sort();
aList.Reverse();
-. sort也可以用如下方式操作:
list.Sort((a, b) => a.CompareTo(b));//升序
list.Sort((a, b) => b.CompareTo(a));//降序
方法二:利用List的OrderBy与OrderByDescending方法
升序排列:
List<int> aList = new List<int> 18, 17, 21, 23, 11, 31, 27, 38 ;
aList = aList.OrderBy(a => a).ToList();
降序排列:
List<int> aList = new List<int> 18, 17, 21, 23, 11, 31, 27, 38 ;
aList = aList.OrderByDescending(a => a).ToList();
方法三:利用link,这种感觉和方法二是一回事
List<int> aList = new List<int> 18, 17, 21, 23, 11, 31, 27, 38 ;
aList = (from a in aList orderby a ascending select a).ToList();//升序
aList = (from a in aList orderby a descending select a).ToList();//降序
②如果list存放的是一个类型,比如:
方法一: 一个集合存放学生的信息,按照学生的成绩升序排列:这里列举了2种方法,方法一注释了
static void Main(string[] args)
List<Student> stuList = new List<Student>
new Student() name = "zyr", age = 23, score = 99,
new Student() name = "zls", age = 25, score = 95,
new Student() name = "zsq", age = 27, score = 100,
new Student() name = "zlw", age = 15, score = 69,
new Student() name = "ywe", age = 17, score = 72,
new Student() name = "asw", age = 29, score = 58
;
//方法1 升序
//stuList.Sort((x, y) => x.score.CompareTo(y.score));
//方法2 升序
stuList = stuList.OrderBy(stu=>stu.score).ToList();
foreach (var stu in stuList)
Console.WriteLine($"stu");
Console.ReadKey();
public class Student
public string name get; set;
public int age get; set;
public int score get; set;
public override string ToString()
return $"姓名是:name,年龄是:age,得分是:score";
运行结果:
方法二: 加入这个学生成绩有重复的,对于重复的成绩按照年龄再排序:这里列举了2种方法,方法一注释了
static void Main(string[] args)
List<Student> stuList = new List<Student>
new Student() name = "zyr", age = 23, score = 99,
new Student() name = "zls", age = 25, score = 95,
new Student() name = "zls", age = 22, score = 95,
new Student() name = "zsq", age = 27, score = 100,
new Student() name = "zlw", age = 15, score = 69,
new Student() name = "ywe", age = 17, score = 72,
new Student() name = "asw", age = 29, score = 58,
new Student() name = "ywe", age = 18, score = 72,
new Student() name = "zsq", age = 16, score = 100,
;
//方法1 升序
//stuList.Sort((x, y) =>
//
// int ret = x.score.CompareTo(y.score);
// if (ret == 0)
//
// return x.age.CompareTo(y.age);
//
// else
//
// return ret;
//
//);
//方法2 升序
//stuList = stuList.OrderBy(stu=>stu.score).ThenBy(stu => stu.age).ToList();
foreach (var stu in stuList)
Console.WriteLine($"stu");
Console.ReadKey();
public class Student
public string name get; set;
public int age get; set;
public int score get; set;
public override string ToString()
return $"姓名是:name,年龄是:age,得分是:score";
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