狀態模式

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

namespace ConsoleApplication32
{
    public interface States
    {
        void PreProduction(Context context); //上機
        void PostProduction(Context context);//下機
        void MaterialImput(Context context);//物料錄入
    }

    public  class Context
    {
        public Context(States state)
        {
            this.currentState = state;
        }
        private States currentState;
        public States CurrentState
        {
            //set
            //{
            //    currentState = value;
            //}

            get { return currentState; }
            set { currentState = value; }
        }

        /// <summary>
        /// 执行当前状态
        /// </summary>
        public virtual void PreProduction() { this.currentState.PreProduction(this); }
        public virtual void PostProduction() { this.currentState.PostProduction(this); }
        public virtual void MaterialImput() { this.currentState.MaterialImput(this); }
    }

    /// <summary>
    /// 空閒
    /// </summary>
    public class OpenState : States
    {
        public void PreProduction(Context context)
        {
            Console.WriteLine("FLOW卡上機成功");
            context.CurrentState = new Opening();
        }

        public void PostProduction(Context context)
        {
        
            Console.WriteLine("FLOW卡還未物料錄入,無法下機");

        }

        public void MaterialImput(Context context)
        {
            Console.WriteLine("FLOW卡未上機不能進行物料錄入");

        }
    }
 
    /// <summary>
    /// 完成
    /// </summary>
    public class CloseState : States
    {
        public void PreProduction(Context context)
        {
            Console.WriteLine("FLOW卡正在上機中，無法重複上機");
           
        }

        public void PostProduction(Context context)
        {
            Console.WriteLine("物料已錄入,成功下機");
            context.CurrentState = new OpenState();
        }

        public void MaterialImput(Context context)
        {
            Console.WriteLine("物料已錄入,無法重複錄入");
          
        }
    }

    /// <summary>
    /// 生產中
    /// </summary>
    public class Opening : States
    {
        public void PreProduction(Context context)
        {
            Console.WriteLine("FLOW卡正在上機中，無法重複上機");
        
        }

        public void PostProduction(Context context)
        {
            Console.WriteLine("物料還未錄入,無法下機");
        }

        public void MaterialImput(Context context)
        {
            Console.WriteLine("FLOW已上機,物料成功錄入");
            context.CurrentState = new CloseState();
        }
    }
}

using ConsoleApplication32;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


namespace ConsoleApplication5
{
    class Program
    {
        static void Main(string[] args)
        {

            Context contexts = new Context(new OpenState());
            contexts.PreProduction();//上機
            contexts.PostProduction();//下機
            contexts.MaterialImput();//物料錄入

            contexts.PreProduction();
            contexts.PostProduction();
            contexts.MaterialImput();
            Console.ReadKey();
        }
    }
}