第五章项目:体检套餐管理系统

该项目主要练习泛型集合List<T>和Dictionary<K,V>的用法，以该项目为依托，让我们对内存中数据的存在结构更加清晰

效果

首先，我们先来准备我们需要的类

提取出两个类，一个是  HealthCheckItem (检查项目类)和HealthCheckSet(体检套餐类).

首先我们要理清两个类的关系，一项套餐中可以包含多项项目检查.

1.检查项目类

HealthCheckItem:包括项目名称、单价和描述3个属性

例如：肝功能、用于检查肝功能、60

然后写一个带参构造函数，对这三个字段赋值

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

namespace Demo04体检项目
{
   public  class HealthCheckItem
    {
        private string name;

        public string Name
        {
            get { return name; }
            set { name = value; }
        }
        private string description;

        public string Description
        {
            get { return description; }
            set { description = value; }
        }
        private int price;

        public int Price
        {
            get { return price; }
            set { price = value; }
        }
        public HealthCheckItem(string name, string description, int price)
        {
            this.Name = name;
            this.Description = description;
            this.Price = price;
        }
      
    }
}

2.检查套餐类

HealthCheckSet:包括要检查的项目、套餐名称、总价(所有要检查项目之和)

所以这里我们就要考虑检查项目的类型：

可以定义一个泛型集合来存储项目的类型，如List<HealthCheckItem>

然后写2个构造函数对List<HealthCheckItem>

进行初始化

 public HealthCheckSet()
    {
        items = new List<HealthCheckItem>();
    }
   public HealthCheckSet(string name, List<HealthCheckItem> item)
    {
    this.Name = name;
    this.Items= item;
      }

体检项目变更时，需要调用CalcPrice()方法重新计算总价

 public void CalcPrice()
   {
       int totalPrice = 0;
       foreach (HealthCheckItem item in items)
       {
           totalPrice += item.Price; ;

       }
       this.price += totalPrice;
   }

套餐类:

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

namespace Demo04体检项目
{
   public  class HealthCheckSet
    {
        private string name;

        public string Name
        {
            get { return name; }
            set { name = value; }
        }
        private int price;

        public int Price
        {
            get { return price; }
            set { price = value; }
        }
       
        private List<HealthCheckItem> items;

    public  List<HealthCheckItem> Items
    {
       get { return items; }
       set { items = value; }
     }
    public HealthCheckSet()
    {
        items = new List<HealthCheckItem>();
    }
   public HealthCheckSet(string name, List<HealthCheckItem> item)
    {
    this.Name = name;
    this.Items= item;
      }
   public void CalcPrice()
   {
       int totalPrice = 0;
       foreach (HealthCheckItem item in items)
       {
           totalPrice += item.Price; ;

       }
       this.price += totalPrice;
   }
    }
}

3.在窗体中做一些初始化工作

我们需要使用集合来存储对应的数据,因为套餐 有多个,体检项目也有很多.定义一些容器来保存数据.

       //定义几个检查项目
        HealthCheckItem height,weight,sight,hearing,liverFun,ekg,bWaves,bloodPressure,bloodTest;
      
        //定义1个系统默认检查套餐"入学体检"
        HealthCheckSet setA;

        //保存所有的体检项目
        //List<HealthCheckItem> AllItems = new List<HealthCheckItem>();
      public  Dictionary<string,HealthCheckItem> AllItems = new Dictionary<string,HealthCheckItem>();
        //保存套餐中的体检项目
        List<HealthCheckItem> items = new List<HealthCheckItem>();

        //使用字典保存套餐集合
        public Dictionary<string, HealthCheckSet> HealthSet = new Dictionary<string, HealthCheckSet>();

4.初始化所有检查项目

 public void InitItems()
        {
            height = new HealthCheckItem("身高", "用于检查身高", 10);
            weight = new HealthCheckItem("体重", "用于检查体重", 5);
            sight = new HealthCheckItem("视力", "用于检查视力", 15);
            hearing = new HealthCheckItem("听力", "用于检查听力", 20);
            liverFun = new HealthCheckItem("肝功能", "用于检查肝功能", 100);
            ekg = new HealthCheckItem("B超", "用于检查B超", 10);
            bWaves = new HealthCheckItem("心电图", "用于检查心电图", 100);
            bloodPressure = new HealthCheckItem("血压", "用于检查血压", 20);
            bloodTest = new HealthCheckItem("血常规", "用于检查血常规", 20);

            AllItems.Add(height.Name, height);
            AllItems.Add(weight.Name,weight);
            AllItems.Add(sight.Name,sight);
            AllItems.Add(hearing.Name,hearing);
            AllItems.Add(liverFun.Name,liverFun);
            AllItems.Add(ekg.Name,ekg);
            AllItems.Add(bWaves.Name,bWaves);
            AllItems.Add(bloodPressure.Name,bloodPressure);
            AllItems.Add(bloodTest.Name,bloodTest);
        }

5.生成默认套餐数据

        public void InitSets()
        {
            //创建1种默认套餐对象
            items = new List<HealthCheckItem>();
            items.Add(height);
            items.Add(weight);
            items.Add(liverFun);

            setA = new HealthCheckSet("入学体检", items);
            //计算套餐价格
            setA.CalcPrice();
            this.HealthSet.Add("入学体检", setA);
        }

  6.套餐列表 下拉框的加载方法

public void InitHealthSetList()
        {
            //首先清空套餐下拉列表
            this.cboList.Items.Clear();
            //添加请选择
            this.cboList.Items.Add("请选择");
            //将Dictionary的key值绑定到combobox上,作为combobox的显示值
            foreach (string  key in this.HealthSet.Keys)
            {
                this.cboList.Items.Add(key);
            }
            //默认第一项为选中
            this.cboList.SelectedIndex = 0;
        }

7.检查项目 下拉框的加载方法

public void HealthList()
        {
            cboxm.Items.Clear();
            cboxm.Items.Add("请选择");
            foreach (string item in AllItems.Keys)
            {
                this.cboxm.Items.Add(item);
            }
            this.cboxm.SelectedIndex = 0;
        }

8.在Load的事件里调用方法

private void Form1_Load(object sender, EventArgs e)
        {
            //初始化所有检查项目,和套餐无关
            InitItems();
            //初始化默认套餐
            InitSets();
            //加载套餐下拉列表框
            InitHealthSetList();
            //加载项目下拉列表
            HealthList();
        }

9.当套餐下拉框选择项发生改变时，需要加载所选套餐下对应的体检项目

 //填充套餐的DataGridView的方法
        public void UpdateSet(HealthCheckSet set)
        {
            if (set.Item == null)
            {
                //给DataGridView的数据源赋空值
                dgvList.DataSource = new BindingList<HealthCheckItem>();
                return;
            }
            else
            {
                dgvList.DataSource = new BindingList<HealthCheckItem>(set.Item);
            }

        }

10.在DataGirdView中添加项目

 private void btnInsert_Click(object sender, EventArgs e)
        {

            if (this.cboxm.SelectedIndex == 0)
            {
                MessageBox.Show("请选择一个项目");
                return;
            }
            string cboset = this.cboxm.Text;
            if (cboset == "请选择")
            {
                MessageBox.Show("请选择套餐");
                return;
            }
            //int index = this.cboxm.SelectedIndex - 1;
            if (!this.HealthSet[cboList.Text].Items.Contains(AllItems[cboset]))
            {
                this.HealthSet[cboList.Text].Items.Add(AllItems[cboset]);
                this.HealthSet[cboList.Text].CalcPrice();
                //dgvList.DataSource = new BindingList<HealthCheckItem>(this.HealthSet[cboList.Text].Items);
                UpdateSet(this.HealthSet[cboList.Text]);
                lblSetName.Text = this.HealthSet[cboList.Text].Name;
                lblSetprice.Text = this.HealthSet[cboList.Text].Price.ToString();

            }
            else
            {
                MessageBox.Show("已经有该项目的存在了", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Error);
            }
        }

11.在DataGirdView中删除项目

private void btndelete_Click(object sender, EventArgs e)
        {
            string key = dgvList.SelectedRows[0].Cells[1].Value.ToString();
            this.HealthSet[cboList.Text].Items.Remove(AllItems[key]);
            dgvList.DataSource=new BindingList<HealthCheckItem>(this.HealthSet[cboList.Text].Items);
            btndelete.Enabled = false;//删除按钮的禁用
        }

        public string name;
        private void dgvList_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            if (dgvList.SelectedRows.Count != 1 || dgvList.SelectedRows[0].Cells[1].Value == null)
            {
                MessageBox.Show("请你正确的选择一行!", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Error);
                return;
            }
            else
            {
                name = dgvList.SelectedRows[0].Cells[1].Value.ToString();
                btndelete.Enabled = true;//删除按钮的可用
            }
        }

12.在套餐列表中添加套餐

private void btnAdd_Click(object sender, EventArgs e)
        {

            if (txtName.Text.Trim() == "")
            {
                MessageBox.Show("请输入套餐名称!");
                return;
            }
            else
            {

                //声明一个数组
                HealthCheckSet hch = new HealthCheckSet();

                this.HealthSet.Add(this.txtName.Text, hch);
                this.InitHealthSetList();
                //向下拉框显示添加的内容
                this.cboList.SelectedIndex = this.HealthSet.Count;
                lblSetName.Text = cboxm.Text;
                hch.Name = cboList.Text;
                MessageBox.Show("添加成功!");
            }
        }

13.未添加项目时添加按钮为禁用,添加时为可用

 private void cboxm_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (cboxm.Text == "请选择" || cboList.Text == "请选择")
            {
                btnInsert.Enabled = false;//禁用
            }
            else
            {
                btnInsert.Enabled = true;//可用
            }
        }

最后呢,这个项目已经分析完了.