Question

If I have two class like so:

public class Department
{
    public int Id { get; set; }
    public string Name { get; set; }
    public List<Employee> employees { get; set; }
}

public class Employee
{
    public string Name { get; set; }
    public string Job { get; set; }
    public string Date { get; set; }
}

And then if I do this:

var departments = new List<Department>();
Department d = new Department
{
    Id = 1,
    Name = "Depart1",
 };

Department d2 = new Department
{
    Id = 2,
    Name = "Depart2",
 };

 departments.Add(d);
departments.Add(d2);

How Can I add to the employees List in the Department class with a foreach loop? When I do this:

foreach(Department dmt in departments)
{
    Employee worker = new Employee 
    {
        Name = "Steve",
        Job = "Cleanup",
        Date = "Today",
     };

     dmt.employees.Add(worker );
}

I dont get any build errors but nothing is added. Any suggestions?

Answer 1

You aren’t instantiating the employees property. Change your class definition to this:

public class Department
{
    public int Id { get; set; }
    public string Name { get; set; }
    public List<Employee> employees { get; set; }

    public Department()
    {
        employees = new List<Employee> ();
    }
}

Or, if you don’t want to use a constructor to instantiate the employees property, you will just need to ensure that you do this before you attempt to add an Employee object to the List<Employee>.