designPatternGuru/DesignPatternGuru/Facade/Facades/Facade.cs

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

namespace Facade.Facades
{
	internal class Facade
	{
		protected Subsystem1 _subsystem1;
		protected Subsystem2 _subsystem2;

		public Facade(Subsystem1 subsystem1, Subsystem2 subsystem2)
		{
			_subsystem1 = subsystem1;
			_subsystem2 = subsystem2;
		}

		public string Operation()
		{
			StringBuilder builder = new StringBuilder();
			builder.AppendLine("Facade initializes subsystems:");
			builder.AppendLine(_subsystem1.Operation1());
			builder.AppendLine(_subsystem2.Operation1());
			builder.AppendLine("Facade order subsystems to perform the action:");
			builder.AppendLine(_subsystem1.OperationN());
			builder.AppendLine(_subsystem2.OperationN());

			return builder.ToString();
		}
	}
}