C#中对集合排序的三种方式
作者:Darren Ji
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<Student> result = GetStudents().OrderBy(r => r.Score); foreach (var item in result) { Console.WriteLine(item.Name + "--" + item.Score); } Console.ReadKey(); } private static List<Student> GetStudents() { return new List<Student>() { 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<Student>。
如果想使用List<T>的Sort方法,就需要让Student实现IComparable<Student>接口。
class Program { static void Main(string[] args) { List<Student> result = GetStudents(); result.Sort(); foreach (var item in result) { Console.WriteLine(item.Name + "--" + item.Score); } Console.ReadKey(); } private static List<Student> GetStudents() { return new List<Student>() { 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<Student> { 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<Student>接口固然很好,如果Student是一个密封类,我们无法让其实现IComparable<Student>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<Student> result = GetStudents(); result.Sort(new StudentSorter()); foreach (var item in result) { Console.WriteLine(item.Name + "--" + item.Score); } Console.ReadKey(); } private static List<Student> GetStudents() { return new List<Student>() { 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<Student> { 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<T>类型。
2、让集合元素实现IComparable<T>接口,再使用Sort方法,返回void。
3、集合元素不实现IComparable<T>接口,针对集合元素类型写一个实现IComparer<T>接口的类,把该类实例作为Sort方法的参数。
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