通過Linq查找重復數據

一、模擬初始化集合數據

 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、將集合數據按照年齡分組並取出分組大於1的

  var sameAges = students.GroupBy(g => g.Age).Where(s => s.Count() > 1).ToList();

三、將年齡相同的打印出來

 sameAges.ForEach(s => {
                               Console.WriteLine($"*******年齡為{s.Key}一共{ s.Count()}人*******"); s.ForEach(o => Console.WriteLine(o.Name)); });

四、運行效果