简单介绍C#中对集合排序的三种方式

导读 这篇文章介绍了C#中对集合排序的三种方式,文中通过示例代码介绍的非常详细。对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下

对集合排序,可能最先想到的是使用OrderBy方法。

class Program
{
    static void Main(string[] args)
    {
        IEnumerable result = GetStudents().OrderBy(r => r.Score);
        foreach (var item in result)
        {
            Console.WriteLine(item.Name + "--" + item.Score);
        }
        Console.ReadKey();
    }
    private static List GetStudents()
    {
        return new List()
        {
            new Student(){Id = 1, Name = "张三",Age = 15, Score = 80},
            new Student(){Id = 2, Name = "李四",Age = 16, Score = 70},
            new Student(){Id = 3, Name = "赵武",Age = 14, Score = 90}
        };
    }
}
public class Student 
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int Age { get; set; }
    public int Score { get; set; }
}

以上,OrderBy返回的类型是IEnumerable

如果想使用List的Sort方法,就需要让Student实现IComparable接口。

class Program
 {
     static void Main(string[] args)
     {
         List result = GetStudents();
         result.Sort();
         foreach (var item in result)
         {
             Console.WriteLine(item.Name + "--" + item.Score);
         }
         Console.ReadKey();
     }
     private static List GetStudents()
     {
         return new List()
         {
             new Student(){Id = 1, Name = "张三",Age = 15, Score = 80},
             new Student(){Id = 2, Name = "李四",Age = 16, Score = 70},
             new Student(){Id = 3, Name = "赵武",Age = 14, Score = 90}
         };
     }
 }
 public class Student : IComparable
 {
     public int Id { get; set; }
     public string Name { get; set; }
     public int Age { get; set; }
     public int Score { get; set; }
      
     public int CompareTo(Student other)
     {
       return  this.Score.CompareTo(other.Score);
     }
 }

让Student实现IComparable接口固然很好,如果Student是一个密封类,我们无法让其实现IComparable接口呢?不用担心,Sort方法提供了一个重载,可以接收IComparer接口类型。

class Program
 {
     static void Main(string[] args)
     {
         List result = GetStudents();
         result.Sort(new StudentSorter());
         foreach (var item in result)
         {
             Console.WriteLine(item.Name + "--" + item.Score);
         }
         Console.ReadKey();
     }
     private static List GetStudents()
     {
         return new List()
         {
             new Student(){Id = 1, Name = "张三",Age = 15, Score = 80},
             new Student(){Id = 2, Name = "李四",Age = 16, Score = 70},
             new Student(){Id = 3, Name = "赵武",Age = 14, Score = 90}
         };
     }
 }
 public class Student
 {
     public int Id { get; set; }
     public string Name { get; set; }
     public int Age { get; set; }
     public int Score { get; set; }
 }
 public class StudentSorter : IComparer
 {
     public int Compare(Student x, Student y)
     {
         return x.Score.CompareTo(y.Score);
     }
 }

综上,如果我们想对一个集合排序,大致有三种方式:

  • 1、使用OrderBy方法,返回IEnumerable类型。
  • 2、让集合元素实现IComparable接口,再使用Sort方法,返回void。
  • 3、集合元素不实现IComparable接口,针对集合元素类型写一个实现IComparer接口的类,把该类实例作为Sort方法的参数。
  • 原文来自:https://www.jb51.net/article/263638.htm

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