Linq中基于过滤器的动态分组

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 = 35, Gender = "Male" },
    new Person { Name = "David", Age = 40, Gender = "Male" },
    new Person { Name = "Eve", Age = 25, Gender = "Female" }
};

string filter = "Age"; // 过滤条件，可以根据需要进行修改

var groups = data.GroupBy(p =>
{
    if (filter == "Age")
    {
        return p.Age;
    }
    else if (filter == "Gender")
    {
        return p.Gender;
    }
    else
    {
        return null;
    }
});

foreach (var group in groups)
{
    Console.WriteLine("Group: " + group.Key);
    foreach (var person in group)
    {
        Console.WriteLine(" - " + person.Name);
    }
}