【C#重构】——上机余额判断应用的状态模式

Bertha 。 2022-04-13 05:29 168阅读 0赞

## 回顾状态模式： ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3htbDE5OTY_size_16_color_FFFFFF_t_70]  
根据不断的请求或者实时变化，更改状态  
可对状态进行读取并更具判断，设置新的状态  
不同的子状态重写抽象类状态，进行实时判断更改。

## 实战分析： ##

在上机中，要进行实时地余额判断，并进行余额不足和小于最低余额强制下机的操作  
或许实时的余额变化，进行判断余额调整状态。  
**Sate类**

public class StateModel
        {
            public abstract class State
            {
                public abstract string WriteProgram(Context context);
            }
    
            public class Context
            {
                //用到的实体
                private State current;
                private double consume;
                public double Consume { get => consume; set => consume = value; }
                public State Current { get => current; set => current = value; }
    
    
                public void SetState(State s)//改变初始状态，可读当前状态
                {
                    Current = s;
                }
                public string WriteProgram()//请求的处理，并设置下一个状态
                {
                    string a = Current.WriteProgram(this);
                    return a;
                }
    
    
                public class StateOne : State//具体子状态1
                {
                    public override string WriteProgram(Context context)
                    {
                        string a = "null";
                        if (context.Consume >= 10)
                        {
                            a = "null";
                        }
                        else
                        {
                            context.SetState(new StateTwo());
                            context.WriteProgram();
                        }
                        return a;
                    }
                }
    
                public class StateTwo : State//具体子状态2
                {
                    public override string WriteProgram(Context context)
                    {
                        string a = "null";
                        if (context.Consume < 10)
                        {
                            a = "余额不足10元，请尽快充值,以免影响上机！";
                        }
                        else
                        {
                            context.SetState(new StateThree()); context.WriteProgram();
                        }
                        return a;
                    }
                }
    
                public class StateThree : State//具体子状态3
                {
                    public override string WriteProgram(Context context)
                    {
                        string a = "null";
                        if (context.Consume < 5)
                        {
                            a = "余额不足5元，正在下机";
                        }
                        return a;
                    }
    
                }
    
    
            }

**外观层**进行传值

//连接状态模式
            public string InquireyStat(LineInfo outline)
            {
                StateModel.Context cs = new StateModel.Context();
                cs.Consume = outline.Cash;
                string a = cs.WriteProgram();
                Entity.Gloable.Time++;
                return a;
            }

**UI层判断**

private void txtOnUserID_EnabledChanged(object sender, EventArgs e)
            {
                if (txtOnUserID.Enabled == false)//当确定用户已上机，则启动状态模式，实时判断余额情况
                {
                    timerOut.Enabled = true;//计时器开始运行
                    timerOut.Start();//启动计时器          
                }
            }
    
            private void timerOut_Tick(object sender, EventArgs e)
            {
                //student 表 select
                Entity.StudentInfo student = new Entity.StudentInfo();
                student.UserID = Convert.ToInt32(txtOutUserID.Text.Trim());
                DataTable table1;
                Facade.OutLineFacade facade = new Facade.OutLineFacade();
                table1 = facade.SelectStudentFacade(student);
    
                //line_info表，插入上下机记录表 insert
                Entity.LineInfo outline = new Entity.LineInfo();
    
                int balance = Convert.ToInt32(table1.Rows[0][2].ToString());//学生表余额
    
                outline.Consume_time = Convert.ToString(Gloable.Time);//??
    
                //每一小时查看余额
                string a = facade.InquireyStat(outline);
                if (a == "null")
                {
                    return;
                }
                else
                {
                    MessageBox.Show(a, "提示");
                    if (a == "余额不足5元，下机")
                    {
                        //调用下事件
                        btnOutLogin_Click(sender, e);
                        timerOut.Start();
                    }
                }
            }

***还有不完善的地方，多指正***

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