Detailed Explanation of C Combination Pattern Example

This article illustrates the C # composition pattern. Share it for your reference. The details are as follows:

Company. cs is as follows:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
  public abstract class Company
  {
    protected string name;
    public Company(string name) 
    {
      this.name = name;
    }
    public abstract void Add(Company c);
    public abstract void Remove(Company c);
    public abstract void Display(int depth);
    public abstract void LineOfDuty();
  }
}

ConcreteCompany. cs is as follows:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
  public class ConcreteCompany:Company
  {
    private List<Company> children = new List<Company>();
    public ConcreteCompany(string name) 
      :base(name)
    {}
    public override void Add(Company c)
    {
      children.Add(c);
    }
    public override void Remove(Company c)
    {
      children.Remove(c);
    }
    public override void Display(int depth)
    {
      Console.WriteLine(new String('-',depth)+name);
      foreach(Company component in children)
      {
        component.Display(depth+2);
      }
    }
    public override void LineOfDuty()
    {
      foreach(Company component in children)
      {
        component.LineOfDuty();
      }
    }
  }
}

FinanceDepartment. cs is as follows:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
  public class FinanceDepartment:Company
  {
    public FinanceDepartment(string name) : base(name) { }
    public override void Add(Company c)
    {
    }
    public override void Remove(Company c)
    {
      
    }
    public override void Display(int depth)
    {
      Console.WriteLine(new String('-',depth)+name);
    }
    public override void LineOfDuty()
    {
      Console.WriteLine("{0}  Financial payment management ",name);
    }
  }
}

HRdepartment. cs is as follows:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
  public class HRdepartment:Company
  {
    public HRdepartment(string name)
      :base(name)
    { }
    public override void Add(Company c)
    {
    }
    public override void Remove(Company c)
    {
    }
    public override void Display(int depth)
    {
      Console.WriteLine(new String('-',depth)+name);
    }
    public override void LineOfDuty()
    {
      Console.WriteLine("{0}  Recruitment training management ",name);
    }
  }
}

Program. cs is as follows:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
  class Program
  {
    static void Main(string[] args)
    {
      ConcreteCompany root = new ConcreteCompany(" Beijing Total Division ");
      root.Add(new HRdepartment(" Department of Manpower "));
      root.Add(new FinanceDepartment(" Finance Department "));
      ConcreteCompany comp = new ConcreteCompany(" Shanghai Branch ");
      comp.Add(new HRdepartment(" Division of Labor Division Manpower Department "));
      comp.Add(new FinanceDepartment(" Branch finance department "));
      root.Add(comp);
      ConcreteCompany comp1 = new ConcreteCompany(" Nanjing branch ");
      comp1.Add(new HRdepartment(" Nanjing Department of Manpower "));
      comp1.Add(new FinanceDepartment(" Nanjing Finance Department "));
      comp.Add(comp1);
      ConcreteCompany comp2 = new ConcreteCompany(" Hang Chau Branch ");
      comp2.Add(new HRdepartment(" Hangzhou Personnel Department "));
      comp2.Add(new FinanceDepartment(" Hangzhou Finance Department "));
      comp.Add(comp2);
      root.Display(1);
      Console.ReadKey();
    }
  }
}

I hope this article is helpful to everyone's C # programming.