designPatternGuru/DesignPatternGuru/Composite/Composite.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Composite
{
	internal class Composite : Component
	{
		protected List<Component> _children = new List<Component>();

		public override void Add(Component component)
		{
			_children.Add(component);
		}

		public override void Remove(Component component)
		{
			_children.Remove(component);
		}

		public override string Operation()
		{
			int i = 0;
			StringBuilder sb = new StringBuilder();
			sb.Append("Branch(");

			foreach (Component component in _children)
			{
				sb.Append(component.Operation());
				if (i != _children.Count - 1)
					sb.Append("+");

				i++;
			}

			sb.Append(")");
			return sb.ToString();
		}
	}
}