C#复合模式(Composite Pattern)实例教程

public abstract class DepartmentComponent
{
    public string Name { private set; get; }
    public DepartmentComponent(string name)
    {
      this.Name = name;
    }
    public virtual void PrintSupervisorOf(int spacing)
    {
      for (int counter = 0; counter < spacing; counter++)
      {
        Console.Write(" ");
      }
      Console.WriteLine(Name);
    }
}

public class DepartmentComposite : DepartmentComponent
{
    private IList<DepartmentComponent> employees;
    public DepartmentComposite(string name) : base(name)
    {
      employees = new List<DepartmentComponent>();
    }
    public void AddDepartment(DepartmentComponent e)
    {
      employees.Add(e);
    }
    public void RemoveDepartment(DepartmentComponent e)
    {
      employees.Remove(e);
    }
    public override void PrintSupervisorOf(int spacing)
    {
      base.PrintSupervisorOf(spacing);
      foreach (DepartmentComponent e in employees)
      {
        e.PrintSupervisorOf(spacing + 1);
      }
    }
}

public class Department : DepartmentComponent
{
    public Department(string name) : base(name)
    {
      
    }
    public override void PrintSupervisorOf(int spacing)
    {
      base.PrintSupervisorOf(spacing);
    }
}

class Program
{
    static void Main(string[] args)
    {
      DepartmentComposite salesDepartment1 = new DepartmentComposite("销售部1");
      Department zhangsan = new Department("张三");
      Department lisi = new Department("李四");
      DepartmentComposite salesDepartment2 = new DepartmentComposite("销售部2");
      DepartmentComposite specialDepartment = new DepartmentComposite("销售部2特别行动组");
      Department wangwu = new Department("王五");
      Department zhaoliu = new Department("赵六");
      DepartmentComposite salesDepartment = new DepartmentComposite("销售部");
      salesDepartment.AddDepartment(salesDepartment1);
      salesDepartment.AddDepartment(salesDepartment2);
      salesDepartment1.AddDepartment(zhangsan);
      salesDepartment1.AddDepartment(lisi);
      salesDepartment2.AddDepartment(specialDepartment);
      specialDepartment.AddDepartment(wangwu);
      specialDepartment.AddDepartment(zhaoliu);
      salesDepartment.PrintSupervisorOf(0);
      Console.ReadKey();
    }
}