C#汽车租赁系统

类图：

父类（车类，抽象类）

 /// <summary>
    /// 车辆基本信息类。搞一个抽象类玩玩
    /// </summary>
   public abstract class Vehicle
    {
        public string Color { get; set; }//颜色
        public double DailyRent { get; set; }//日租金
        public string LicenseNo { get; set; }//车牌号
        public string Name { get; set; }//车名
        public int RentDate { get; set; }//使用时间
        public string RentUser { get; set; }//租用者
        public int YearsOfService { get; set; }//租用天数
        public Vehicle()
        {

        }
       //构造
        public Vehicle(string color, double dailyRent, string licenseNo,string name,int rentDate)
        {
            this.Color = color;
            this.Name = name;
            this.RentDate = rentDate;
            this.LicenseNo = licenseNo;
            this.DailyRent = dailyRent;
        }
        //结算租金抽象方法
        public abstract double GetJieSuang();

    }

汽车类：

 /// <summary>
    /// 汽车类
    /// </summary>
    public  class Car:Vehicle
    {
        public Car()
        {
        }
        //构造
        public Car(string licenseNo, string name, string color, int rentDate, double dailyRent)
            :base(color, dailyRent,licenseNo,name, rentDate)
        {                                                                                                                           

        }
        //重写父类计算价格的方法
        public override double GetJieSuang()
        {
            //日租金*租的天数
            double result = this.DailyRent * this.YearsOfService;
            return result;
        }
    }

卡车类：

  /// <summary>
    /// 卡车类
    /// </summary>
   public class Truck:Vehicle
    {
        public int Load { get; set; }//卡车载重
       //无参构造
        public Truck()
        {

        }
        //构造
        public Truck(string licenseNo, string name, string color, int rentDate, double dailyRent, int load)
            : base(color, dailyRent, licenseNo, name, rentDate)
        {
            this.Load = load;
        }
        //重写父类计算租金的方法
        public override double GetJieSuang()
        {
            //日租金*租的天数
            double result = this.DailyRent * this.YearsOfService;
            return result;
        }
    }

具体实现：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace CarRentalSystem
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.cbColor.SelectedIndex = 0;//显示颜色
            this.txtTruckLoad.Visible = false;
        }
        //保存可租用车的集合
        Dictionary<string, Vehicle> vehicle = new Dictionary<string,Vehicle>();
        //保存已租出的车的集合
        Dictionary<string, Vehicle> rentvehcile = new Dictionary<string,Vehicle>();

        //动态加载listview的方法
        public void carZaiZhong()
        {
            if (rbcar.Checked == true)
            {
                this.txtTruckLoad.Visible = false;
            }
            else if(rbTruck.Checked==true)
            {
                this.txtTruckLoad.Visible = true;
            }
        }
        /// <summary>
        /// 刷新ListView的带参方法，传两个不同集合 和刷新对应的ListView
        /// </summary>
        /// <param name="list"></param>
        /// <param name="lvlist"></param>
        public void New(Dictionary<string, Vehicle> list, ListView lvlist)
        {
            ListViewItem listview = null;//局部变量要赋初始值
            lvlist.Items.Clear();//清除项
            foreach (Vehicle item in list.Values)
            {
                //如果是Car，对应的ListView添加数据
                if (item is Car)
                {
                    listview = new ListViewItem();//new出ListViewItem视图
                    listview.Text = item.LicenseNo;//listView第一列
                    listview.SubItems.Add(item.Name);//添加子项车名
                    listview.SubItems.Add(item.Color);//颜色
                    listview.SubItems.Add(item.RentDate.ToString());//使用时间
                    listview.SubItems.Add(item.DailyRent.ToString());//日租金
                    listview.SubItems.Add("无");

                }
                else if (item is Truck)
                {
                    listview = new ListViewItem();
                    listview.Text = item.LicenseNo;
                    listview.SubItems.Add(item.Name);
                    listview.SubItems.Add(item.Color);
                    listview.SubItems.Add(item.RentDate.ToString());
                    listview.SubItems.Add(item.DailyRent.ToString());
                    listview.SubItems.Add(((Truck)item).Load.ToString());
                }
                lvlist.Items.Add(listview);//添加到对应集合的ListView中
            }

        }
        /// <summary>
        /// 初始化可租用车集合信息
        /// </summary>
        public void initial()
        {
            Truck truck = new Truck("京A88888", "大卡", "红色", 3, 900, 20);//卡车
            Car car = new Car("京A99999", "奔驰", "黑色", 3, 300);//汽车信息      

            vehicle.Add(truck.LicenseNo, truck);//添加到可租车集合
            vehicle.Add(car.LicenseNo, car);
            //租车数据
            New(vehicle, lvCarkezu);
        }
        /// <summary>
        /// 初始化已租出车的信息
        /// </summary>
        public void initialHc()
        {
            //对象初始化信息
            Truck truck1 = new Truck("京B99999", "小卡", "红色", 3, 280, 10);//卡车
            Car car1 = new Car("京B99999", "红旗", "黑色", 3, 280);//汽车信息
            rentvehcile.Add(truck1.LicenseNo, truck1);//添加到已租车集合
            rentvehcile.Add(car1.LicenseNo, car1);
            //还车数据
            New(rentvehcile, lvHuanche);
        }
        //选择结算，还车
        private void button5_Click(object sender, EventArgs e)
        {

            //租用天数非空验证
            if (this.txtRendDay.Text == "")
            {
                MessageBox.Show("请输入天数！");
                return;
            }
            //确定是否选中一行
            if (this.lvHuanche.SelectedItems.Count == 0)
            {
                MessageBox.Show("请选择一行！");
                return;
            }
            //获取车牌号的值
            string carnum1 = this.lvHuanche.SelectedItems[0].Text;
            //根据车牌号获得对应的车辆对象
            Vehicle ve = rentvehcile[carnum1];

            //获取租用天数
            int num = Convert.ToInt32(this.txtRendDay.Text);
            //给属性使用天数赋值
            ve.YearsOfService = num;
            //结算租金
            double money = ve.GetJieSuang();
            DialogResult result = MessageBox.Show("你要支付" + money + "元", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
            if (result == DialogResult.OK)
            {
                //直接把获得要还的信息放入vehicles集合
                vehicle.Add(carnum1, ve);

                //删除原来的集合
                rentvehcile.Remove(carnum1);

                //重新加载
                New(rentvehcile, lvHuanche);
                MessageBox.Show("还车成功");
            }

        }
        private void textBox5_TextChanged(object sender, EventArgs e)
        {

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            initial();//初始化信息
            initialHc();

        }
        private void button1_Click(object sender, EventArgs e)
        {
              //退出
            DialogResult choice = MessageBox.Show("确定要退出吗？", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
              if(choice==DialogResult.OK)
              {
                  Application.Exit();
              }
        }
        //新车入库车型验证，非空验证
        public bool emptyNo()
        {
            //如果选择了汽车
            if (this.rbcar.Checked == true)
            {
                if (this.txtLicenseNo.Text != "" && this.
                    txtDailyRent.Text != "" && this.txtName.Text != "" && this.txtRentDate.Text != "")
                {
                    try
                    {
                            //文本框数字验证
                            int rntDate = int.Parse(this.txtRentDate.Text);
                            int dailyRent = int.Parse(this.txtDailyRent.Text);
                            //double truckLoad = double.Parse(this.txtTruckLoad.Text);
                            return true;
                    }
                    catch (Exception)
                    {
                        MessageBox.Show("使用时间，日租金应输入数字！");
                        return false;
                    }
                }
                else
                {
                    MessageBox.Show("请完善新入库汽车信息！");
                    return false;
                }

            }
            else if (this.rbTruck.Checked == true)
            {
                if (this.txtLicenseNo.Text != "" && this.txtDailyRent.Text != "" && this.txtName.Text != "" && this.txtRentDate.Text != ""&&this.txtTruckLoad.Text!="")
                {
                    try
                    {
                        //文本框数字验证
                        int rntDate = int.Parse(this.txtRentDate.Text);
                        int dailyRent = int.Parse(this.txtDailyRent.Text);
                        double truckLoad = double.Parse(this.txtTruckLoad.Text);
                        return true;

                    }
                    catch (Exception)
                    {
                        MessageBox.Show("使用时间，日租金或卡车载重应输入数字！");
                        return false;
                    }
                }
                else
                {
                    MessageBox.Show("请完善新入库卡车信息！");
                    return false;
                }
            }
            return true;//防止报错
        }
        //新车入库
        private void btnRuku_Click(object sender, EventArgs e)
        {
            //文本框非空验证
            if (emptyNo())
            {
                //对车载重的值做一个判断，然后存入不同的集合
                if(this.txtTruckLoad.Visible==false)
                {
                    //车牌号是唯一的
                     string licenseNo=this.txtLicenseNo.Text;//车牌号
                     foreach (string ve in vehicle.Keys)//循环查看是否有相同的车牌号，有给出提示
                     {
                        if (ve == licenseNo)
                         {
                             MessageBox.Show("已经有相同的汽车车牌号，请您重新确认车牌号！");
                             return;
                         }
                     }

                    string name =this.txtName.Text;//车名
                    string cbColor = this.cbColor.SelectedItem.ToString();//颜色
                    int rentDate=Convert.ToInt32(this.txtRentDate.Text);//使用时间
                    double dailyRent = Convert.ToDouble(this.txtDailyRent.Text);//每日租金
                    //双列集合一般用对象初始化器，单列集合用集合初始化器，在添加数据的时候比较清晰，方便但是我这里没用。。。
                    Car car = new Car(licenseNo, name, cbColor, rentDate, dailyRent);
                    //添加到可租车集合
                    vehicle.Add(car.LicenseNo,car);
                    MessageBox.Show("汽车入库成功!");
                }
                else if (this.txtTruckLoad.Visible == true)
                {
                    //车牌号是唯一的
                    string licenseNo = this.txtLicenseNo.Text;//车牌号
                    foreach (string rve in vehicle.Keys)//循环查看是否有相同的车牌号，有给出提示
                    {
                        if (rve== licenseNo)
                        {
                            MessageBox.Show("已经有相同的卡车车牌号，请您重新确认车牌号！");
                            return;
                        }
                    }
                    string name = this.txtName.Text;//车名
                    string cbColor = this.cbColor.SelectedItem.ToString();//颜色
                    int rentDate = Convert.ToInt32(this.txtRentDate.Text);//使用时间
                    double dailyRent = Convert.ToDouble(this.txtDailyRent.Text);//每日租金
                    int load = Convert.ToInt32(this.txtTruckLoad.Text);
                    //初始化信息
                    Truck tk = new Truck(licenseNo, name, cbColor, rentDate, dailyRent,load);
                    //添加到可租车集合
                    vehicle.Add(tk.LicenseNo, tk);

                    MessageBox.Show("卡车入库成功!");
                }

            }
        }

        private void btnBreak_Click(object sender, EventArgs e)
        {
            //刷新
            New(vehicle, lvCarkezu);

        }

        private void btnRent_Click(object sender, EventArgs e)
        {
            //租车
            if (this.lvCarkezu.SelectedItems.Count == 0)
            {
                MessageBox.Show("请选中一行!");
                return;
            }
            if (txtRentUser.Text == "")//非空判断
            {
                MessageBox.Show("请输入租用者!");
                return;

            }
            //执行租车.
            //获取车牌号的值
            string carnum = this.lvCarkezu.SelectedItems[0].Text;
            Vehicle ve = vehicle[carnum];
            //直接把获得要租的信息放入rentvehicles集合
            rentvehcile.Add(carnum, ve);
            //删除原来的集合
            vehicle.Remove(carnum);

            //重新加载
            New(vehicle, lvCarkezu);
            MessageBox.Show("租车成功");
        }

        private void btnBreakor_Click(object sender, EventArgs e)
        {
            //刷新租出车的信息
            New(rentvehcile, lvHuanche);
        }

        private void rbcar_CheckedChanged(object sender, EventArgs e)
        {
            //选中则显示文本框
            if (this.rbcar.Checked == true)
            {
                this.txtTruckLoad.Visible = false;
            }
        }

        private void rbTruck_CheckedChanged(object sender, EventArgs e)
        {
            //判断是否选中
            //carZaiZhong();
            if (this.rbTruck.Checked == true)
            {
                this.txtTruckLoad.Visible = true;
            }
        }
        private void tabPage3_Click(object sender, EventArgs e)
        {

        }
        private void lvCarkezu_SelectedIndexChanged(object sender, EventArgs e)
        {

        }
    }
}