Linq :在GroupBy中使用变量

using System;
using System.Collections.Generic;
using System.Linq;

public class Student
{
    public string Name { get; set; }
    public int Score { get; set; }
}

public class Program
{
    public static void Main()
    {
        List<Student> students = new List<Student>
        {
            new Student { Name = "Alice", Score = 85 },
            new Student { Name = "Bob", Score = 90 },
            new Student { Name = "Charlie", Score = 85 },
            new Student { Name = "David", Score = 95 }
        };

        var groupedStudents = students.GroupBy(s => s.Score);

        foreach (var group in groupedStudents)
        {
            Console.WriteLine($"Score: {group.Key}, Count: {group.Count()}");
        }
    }
}

int scoreToGroupBy = 85;
var groupedStudents = students.GroupBy(s => s.Score == scoreToGroupBy);

var groupedStudents = students.GroupBy(s => s.Score / 10 * 10); // 按照成绩的十位数分组