如何在ArrayList中添加员工

Question

请谁帮我找出代码中的错误。我无法使用 switch 运算符将员工添加到 arraylist。代码没有显示任何错误，但不能正常工作，并且数组中没有任何内容。提前致谢！

class Program
{
    class Employee : IComparable
    {
        private string name;
        private int level;
        private DateTime hiringDate;

        public Employee(string name, int level, DateTime hiringDate)
        {
            this.name = name;
            this.level = level;
            this.hiringDate = hiringDate;
        }

        public string Name
        {
            get { return name; }
            set { this.name = value; }
        }

        public int Level
        {
            get { return level; }
            set { this.level = value; }
        }

        public DateTime HiringDate
        {
            get { return hiringDate; }
            set { this.hiringDate = value; }
        }

        public int CompareTo(object obj)
        {
            if(obj == null)
            {
                return 1;
            }

            Employee other = obj as Employee;

            int value = this.level.CompareTo(other.level);

            if (value == 0)
            {
                value = this.hiringDate.CompareTo(other.hiringDate);
            }

            return value;
        }

        public void Description()
        {
            Console.WriteLine("Name: {0}, Level: {1}, Hiring Date: {2}", name, level, hiringDate.ToString());
        }
    }

    static void Main(string[] args)
    {
        bool exit = false;
        ArrayList employees = new ArrayList();
        string name;
        int level, pos;
        Employee mostExp;
        DateTime hiringDate;

        while (!exit)
        {
            Console.WriteLine("---------------MENU!---------------");
            Console.WriteLine("1. Display employees by level.");
            Console.WriteLine("2. Add new employee to list.");
            Console.WriteLine("3. Remove employee from list.");
            Console.WriteLine("4. Search for employee by name.");
            Console.WriteLine("5. Get employee with most work expirience. ");
            Console.WriteLine("6. Exit!");

            int choice = int.Parse(Console.ReadLine());

            switch (choice)
            {
                case 1:
                    employees.Sort();
                    Console.WriteLine("----------------------------------");
                    foreach (Employee employee in employees)
                    {
                            employee.Description();
                    }
                    Console.WriteLine("----------------------------------");
                    break;

                case 2:
                    Console.WriteLine("Enter employee name: ");
                    name = Console.ReadLine();

                    Console.WriteLine("Enter employee level: ");
                    level= int.Parse(Console.ReadLine());

                    Console.WriteLine("Enter hiring date 'yyyy-mm-dd': ");
                    hiringDate = DateTime.Parse(Console.ReadLine());
                    break;

                case 3:
                    Console.WriteLine("Delete employee at position: ");
                    pos = int.Parse(Console.ReadLine());
                    employees.RemoveAt(pos);
                    break;

                case 4:
                    Console.WriteLine("Enter employee name: ");
                    name = Console.ReadLine();
                    Console.WriteLine("----------------------------------");
                    foreach (Employee employee in employees)
                    {
                        if (employee.Name == name)
                        {
                            employee.Description();
                        }
                    }
                    Console.WriteLine("----------------------------------");
                    break;

                case 5:
                    mostExp = (Employee)employees[0];

                    foreach (Employee employee in employees)
                    {
                        if(mostExp.HiringDate.CompareTo(employee.HiringDate) == 1)
                        {
                            mostExp = employee;
                        }
                       
                    }
                    Console.WriteLine("Employee with most work experience:");
                    mostExp.Description();
                    break;

                default:
                    return;
            }
        }
    }
}

Answer 1

在 switch case 中，你从命令行读取某些值，并将它们存储在一些局部变量（名称、级别、雇用日期）中，但你根本没有创建 Employee 对象：Employee emp = Employee(name, level, hiringdate).然后，您必须将该员工添加到 ArrayList：employees.add(emp).

如何在ArrayList中添加员工

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