命令模式

   #region 基本使用类
    public class Document
    {
        //具体操作
        public void Display()
        {
            Console.WriteLine("具体操作");
        }
        public void Undo()
        {
            Console.WriteLine("撤销");
        }
        public void Redo()
        {
            Console.WriteLine("恢复");
        }
    }
    #endregion

  #region 抽象命令
    public abstract class DocumentCommand
    {
        protected Document _document;
        public DocumentCommand(Document document)
        {
            this._document = document;
        }
        public abstract void Execute();
    }
    #endregion

 #region 调用者
    public class DocumentInvoker
    {
        List<DocumentCommand> list = new List<DocumentCommand>();
        public DocumentInvoker(params DocumentCommand[] documentcommands)
        {
            foreach (DocumentCommand item in documentcommands)
            {
                list.Add(item);
            }
        }
        public void Execute()
        {
            foreach (DocumentCommand item in list)
            {
                item.Execute();
            }
        }

    }
    #endregion

 static void Main(string[] args)
        {
            Document doc=new Document();//使用类的实例
            DocumentCommand d1 = new DisplayCommand(doc);//命令类1
            UndoCommand d2 = new UndoCommand(doc);////命令类1

            DocumentInvoker di = new DocumentInvoker(d1,d2);//将这两个命令传给调用者
            di.Execute();
            Console.ReadKey();
        }