策略模式 C#

/// <summary>
    /// 抽象策略角色
    /// </summary>
    public interface IStrategy
    {
         void DoSomething();
    }
    /// <summary>
    /// 具体策略角色1
    /// </summary>
    public class ConcreteStrategy1 : IStrategy
    {
        public void DoSomething()
        {
            Console.WriteLine("策略1");
        }
    }
    /// <summary>
    /// 具体策略角色2
    /// </summary>
    public class ConcreteStrategy2 : IStrategy
    {
        public void DoSomething()
        {
            Console.WriteLine("策略2");
        }
    }
    /// <summary>
    /// 封装角色
    /// </summary>
    public class Content
    {
        private IStrategy strategy;
        public Content(IStrategy strategy)
        {
            this.strategy = strategy;
        }
        public void Doanything()
        {
            this.strategy.DoSomething();
        }
    }

 static void Main(string[] args)
        {
            Content content = new Content(new ConcreteStrategy2());
            content.Doanything();
            content = new Content(new ConcreteStrategy1());
            content.Doanything();
        }