机房重构之，职责链模式上机

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Entity;
namespace BLL.上机
{
    /// <summary>
    /// 上机抽象类
    /// </summary>
    public abstract class OpenHandler
    {
        //定义保护名称
        protected OpenHandler successor;
        //设置上下级
        public void SetSuccessor(OpenHandler successor)
        {
            this.successor = successor;
        }
        //定义返回字符串类型的抽象方法
        public abstract string HandleRequest(HanlderEntity online);
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Entity;
namespace BLL.上机
{
    public class OpenLine : OpenHandler
    {
        public override string HandleRequest(HanlderEntity online)
        {
            //实例化判断类
            BLL.OO.JudgeBLL judge = new BLL.OO.JudgeBLL();
            //定义空字符串
            string message = " ";
            //判断是否正在上机
            bool i = judge.SelectLine(online);
            if (i == false)
            {
                message = "此卡号正在上机";
            }
            else
            {
                message = successor.HandleRequest(online);
            }
            return message;
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using BLL;
using Entity;
namespace BLL.上机
{
    public class OpenCash : OpenHandler
    {
        public override string HandleRequest(HanlderEntity online)
        {
            //实例化判断类
            BLL.OO.JudgeBLL judgeBLL = new BLL.OO.JudgeBLL();
            bool falg = judgeBLL.SelectLineCash(online);
            string message = "";
            if (falg == false)
            {
                message = "余额不足,请充值";
            }
            else
            {
                message = successor.HandleRequest(online);
            }
            return message;
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Entity;
namespace BLL.上机
{
    public class OpenInsert : OpenCash
    {
        //OnLineEntity onLineEntity = new OnLineEntity();
        public override string HandleRequest(HanlderEntity online)
        {
            //查询用户基本信息
            dynamic[] vs = OO.SelectBLL.SelectUsersInfo(online);
            //将用户类型插入上机表和上机记录表
            //onLineEntity.CardNo = Convert.ToString(online);
            online.Level = vs[2];
            //onLineEntity.OperatorId = 0;
            //实例化插入类
            BLL.OO.InsertBLL insertBLL = new BLL.OO.InsertBLL();
            //插入正在上机表
            insertBLL.InsertLine(online);
            //插入上机记录表
            insertBLL.InsertOnline(online);
            string message = "上机成功";
            return message;
        }
    }
}