一、模拟初始化集合数据
List<Student> students = new List<Student>()
{
new Student(){ Age=18,Name="jom"},
new Student(){ Age=28,Name="bom"},
new Student(){ Age=18,Name="day"},
new Student(){ Age=38,Name="jim"},
new Student(){ Age=38,Name="lxsh"},
};
二、将集合数据按照年龄分组并取出分组大于1的
var sameAges = students.GroupBy(g => g.Age).Where(s => s.Count() > 1).ToList();
三、将年龄相同的打印出来
sameAges.ForEach(s => {
Console.WriteLine($"*******年龄为{s.Key}一共{ s.Count()}人*******");
s.ForEach(o => Console.WriteLine(o.Name));
});
四、运行效果