Console list showing customers who have a birthday this week, purchases greater than x, and users over 60?

Question

C++ / C#

Create an array containing information about the company's customers. The class contains the following fields: last name, first name, patronymic, date of birth, number of purchases, amount spent. Write a program that, using methods, selects the necessary information and displays: - a list of clients who have a birthday this week; - a list of customers who have purchases for more than X; - the average purchase size for customers of retirement age (over 60).

The array is implemented, it is impossible to implement a list through list and display people who have a birthday this week, who have more than x purchases and the average purchase size for customers over 60, did not parse the lists, examples from the Internet are not very clear.

Answer 1

Hello, you need to dig in more detail towards LINQ
Wrote a small example, with a selection of all users who have a birthday today

List<Person> persons = new List<Person>();
            IEnumerable<Person> birthday = persons
                .Where(x => 
                    x.DateOfBirth.Day == DateTime.Now.Day && x.DateOfBirth.Month == DateTime.Now.Month);