汽车租赁系统 封装。继承和多态

小总结：在汽车租赁系统中用到了类的方法，构造函数，值类型，和引用类型

使用集合储存数据，并能使用封装，继承，多态创建和操作类

关系图

1.租车。。显示系统中所有可出租的汽车，选中要出租的汽车，输入租用人 以出租汽车

代码如下：

 1  public Dictionary<string, Vehicle> vehicles;//可租的车的集合保存 2         public Dictionary<string, Vehicle> renttVehicles;//租出的车的集合保存 3         PRivate void Form1_Load(object sender, EventArgs e) 4         { 5             //将数据加载到集合中 6             vehiclee(); 7             //默认载重量文本框不可用 8             this.txtzai.ReadOnly = true; 9         }10         //构造出两辆小汽车，两辆卡车11         public void vehiclee()12         {13             //实例化未出租字典类型的集合14             vehicles = new Dictionary<string, Vehicle>();15             Car dd = new Car("粉色", 99999, "京P1111", "捷豹TK07", 1);16             Truck ds = new Truck("蓝色", 150, "豫C6644", "长江卡货", 2, 40);17             vehicles.Add(dd.LicenseNo, dd);18             vehicles.Add(ds.LicenseNo, ds);19             //实例化已出租字典类型的集合20             renttVehicles = new Dictionary<string, Vehicle>();21             //出租出去的车22             Car  car= new Car("白色", 240, "京PC9K11", "奥迪A8", 3);23             Truck  truck= new Truck("黑色", 582, "京AP6666", "擎天柱", 5, 30);24             renttVehicles.Add(car.LicenseNo, car);25             renttVehicles.Add(truck.LicenseNo, truck);26             car.RentUser = this.txtname.Text;27 28         }29    public void PrintVehicles(Dictionary<string, Vehicle> rnotrent, ListView lvshow)30         {31             lvshow.Items.Clear();32             foreach (Vehicle item in rnotrent.Values)33             {34                 ListViewItem lvitem = new ListViewItem(item.LicenseNo);35                 if (item is Car)36                 {37                     lvitem.SubItems.Add(item.Name);38                     lvitem.SubItems.Add(item.Color.ToString());39                     lvitem.SubItems.Add(item.YearsOfService.ToString());40                     lvitem.SubItems.Add(item.DailyRent.ToString());41 42                 }43                 if (item is Truck)44                 {45                     lvitem.SubItems.Add(item.Name);46                     lvitem.SubItems.Add(item.Color.ToString());47                     lvitem.SubItems.Add(item.YearsOfService.ToString());48                     lvitem.SubItems.Add(item.DailyRent.ToString());49                     lvitem.SubItems.Add(((Truck)item).Load.ToString());50                 }51                 lvshow.Items.Add(lvitem);52             }53         }                                                                                                                                                                              54         //租车55         private void button2_Click(object sender, EventArgs e)56         {57             if (txtname.Text=="")58             {59                 MessageBox.Show("请您输入租用者的姓名再来租用！哦");60                 return;61             }62             //从可租车辆集合中移除车辆A63             //将A添加到已租车辆集合中64             if (listView1.SelectedItems.Count>0)65             {66                 string number = listView1.SelectedItems[0].Text;67                 Vehicle ve = vehicles[number];68                 vehicles.Remove(number);69                 PrintVehicles(vehicles, listView1);//重新绑定 ListView70                 renttVehicles.Add(number, ve);71                 MessageBox.Show("已出租。", "提示！", MessageBoxButtons.OK, MessageBoxIcon.Information);72             }73         }74         //刷新75         private void button1_Click(object sender, EventArgs e)76         {77             PrintVehicles(vehicles, listView1);78         }

1         //关闭窗体2         private void button6_Click(object sender, EventArgs e)3         {4             this.Close();5         }

2.还车。在还车列表中选择汽车信息，输入出租天数，计算租金

    //结算        private void button3_Click(object sender, EventArgs e)        {            if (textBox2.Text==string.Empty)            {                MessageBox.Show("请输入租出时间！");                return;            }            //01.将车A从已租集合中移除   //02,将车A加入到可租车辆中            string number = listView2.SelectedItems[0].Text;            Vehicle ve = renttVehicles[number];            renttVehicles.Remove(number);            PrintVehicles(renttVehicles, listView2);//重新绑定 ListView            vehicles.Add(number, ve);            ve.RentDate = Convert.ToInt32(textBox2.Text);            double money = 0;            money = ve.CalcPrice();            MessageBox.Show("您需要支付"+money+"元");        }        //刷新        private void button4_Click(object sender, EventArgs e)        {            PrintVehicles(renttVehicles, listView2);        }

3.新手入库。需要录入汽车的车牌号，车型，颜色使用时间和每日租金。如果是卡车还要录入卡车的载重，

 1       //入库 2         private void button5_Click(object sender, EventArgs e) 3         { 4             if (txthao.Text == string.Empty || txtxing.Text == string.Empty || cmdse.Text == string.Empty || txtshijan.Text == string.Empty  5                 || txtmei.Text == string.Empty) 6             { 7                 MessageBox.Show("请您都填写完整在入库！"); 8             } 9             else10             {11                 string linno = txthao.Text;12                 string xing = txtxing.Text;13                 string color = cmdse.Text;14                 int time = Convert.ToInt32(txtshijan.Text);15                 double zu = Convert.ToDouble(txtmei.Text);16                 if (radioButton1.Checked)17                 {18                     Car dd = new Car(color, zu, linno, xing, time);19                     vehicles.Add(linno, dd);20                 }21                 if (radioButton2.Checked)22                 {23                     24                     int load = Convert.ToInt32(txtzai.Text);25                     Truck ds = new Truck(color, zu, linno, xing, time, load);26                     vehicles.Add(linno, ds);27                 }28                 MessageBox.Show("添加成功@！");29             }30         }31         //切换到汽车载重量变成不可选用32         private void radioButton1_CheckedChanged(object sender, EventArgs e)33         {34             this.txtzai.ReadOnly = true;35         }36         //切换到卡车添加清空一下所有的文本框37         private void radioButton2_CheckedChanged(object sender, EventArgs e)38         {39             this.txthao.Text = string.Empty;40             this.txtmei.Text = string.Empty;41             this.txtname.Text = string.Empty;42             this.txtshijan.Text = string.Empty;43             this.txtxing.Text = string.Empty;44             this.txtzai.Text = string.Empty;45             this.txtzai.ReadOnly = false;46         }