C#中的复杂分组依据

var data = new List<Person>
{
    new Person { Name = "Alice", Age = 25, Gender = "Female" },
    new Person { Name = "Bob", Age = 30, Gender = "Male" },
    new Person { Name = "Charlie", Age = 25, Gender = "Male" },
    new Person { Name = "David", Age = 30, Gender = "Male" },
    new Person { Name = "Eve", Age = 25, Gender = "Female" }
};

var result = from person in data
             group person by new { person.Age, person.Gender } into groupedData
             select new
             {
                 Age = groupedData.Key.Age,
                 Gender = groupedData.Key.Gender,
                 Count = groupedData.Count()
             };

foreach (var item in result)
{
    Console.WriteLine($"Age: {item.Age}, Gender: {item.Gender}, Count: {item.Count}");
}