class Student {public int StuId { get; set; }public string ClassName { get; set; }public string StudentName { get; set; } } static List<Student> studentList = new List<Student> {new Student {ClassName = "軟工一班", StudentName = "康巴一", StuId = 1},new Student {ClassName = "軟工一班", StudentName = "康巴二", StuId = 2},new Student {ClassName = "軟工一班", StudentName = "康巴三", StuId = 3},new Student {ClassName = "軟工二班", StudentName = "康定一", StuId = 4},new Student {ClassName = "軟工二班", StudentName = "康定二", StuId = 5},new Student {ClassName = "軟工二班", StudentName = "康定三", StuId = 6}, };

發現只能根據一個字段進行 GroupBy,能獲取到分組好的 Student 對象
根據key 值取不同分組：

static void Main(string[] args) {IEnumerable<IGrouping<string,Student>> studentGroup = studentList.GroupBy(s => s.ClassName);foreach (IGrouping<string, Student> item in studentGroup){Console.WriteLine(item.Key);//對item 在進行遍歷foreach (Student student in item){Console.WriteLine(student.StudentName);}}Console.ReadKey(); }

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