C#中對集合排序的三種方式
對集合排序,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 = "張三",Age = 15, Score = 80}, new Student(){Id = 2, Name = "李四",Age = 16, Score = 70}, new Student(){Id = 3, Name = "趙武",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返回的類型是IEnumerable<Student>。
如果想使用List<T>的Sort方法,就需要讓Student實現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 = "張三",Age = 15, Score = 80}, new Student(){Id = 2, Name = "李四",Age = 16, Score = 70}, new Student(){Id = 3, Name = "趙武",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); } }
讓Student實現IComparable<Student>接口固然很好,如果Student是一個密封類,我們無法讓其實現IComparable<Student>接口呢?不用擔心,Sort方法提供了一個重載,可以接收IComparer接口類型。
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 = "張三",Age = 15, Score = 80}, new Student(){Id = 2, Name = "李四",Age = 16, Score = 70}, new Student(){Id = 3, Name = "趙武",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); } }
綜上,如果我們想對一個集合排序,大致有三種方式:
1、使用OrderBy方法,返回IEnumerable<T>類型。
2、讓集合元素實現IComparable<T>接口,再使用Sort方法,返回void。
3、集合元素不實現IComparable<T>接口,針對集合元素類型寫一個實現IComparer<T>接口的類,把該類實例作為Sort方法的參數。
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