C#超市收银系统设计

2.操作界面:

代码如下：

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 梦之翼小组项目
{
 public partial class caozuoyemain : Form
 {
  public caozuoyemain()
  {
   InitializeComponent();
  }
  public double totalPrice;//每种商品的总价
  public double total; //所有商品的总价
  public double shijijin;//顾客给的钱数
  public double yingzhao;// 找给顾客的钱数
  public string mingcheng;//每件商品的名称
  public double shuliang;//每件商品的数量
  public double jiage;//每件商品的价格
  public int i = 0; //商品收费的id
 
  model db = new model(); //实例化数据库对象
 
  public void fanli() //单件物品的返利方法
  {
   if (jiage * shuliang < 600 && jiage * shuliang > 300)
   {
    totalPrice = jiage * shuliang - 100;
   }
   else
   {
    totalPrice = jiage * shuliang;
   }
  }
 
  private void confirm_Click(object sender, EventArgs e) //单击确定按钮的事件
  {
   totalPrice = 0; //每一次商品的单个金额
 
   jiage = Convert.ToDouble(price.Text);
   shuliang = Convert.ToDouble(number.Text); //数据类型的转换
   
   switch (jisuanfangshi.SelectedIndex)
   {
    case 0:
     totalPrice = jiage * shuliang;
      
     break;
    case 1:
      totalPrice = jiage * shuliang*0.8;
      
     break;
    case 2:
     fanli(); //调用单个物品的返利方法
     
     break;
   }
 
 
   total = totalPrice + total; //所有商品的总金额
 
   zongjine.Text = total.ToString();//总金额转换数据类型，显示到文本框里面
 
   
   i++; //每一次的商品id加1，为了调出所有商品的最后一个数据
 
   db.dbcon();
   try
   {
    string insertInfo = "insert wupin values('" + i.ToString() + "','" + tradeName.Text + "','" + price.Text + "','" +
     number.Text + "','" + jisuanfangshi.Text + "','" + totalPrice.ToString() + "')";
    db.dbInsert(insertInfo);
 
    string selstr = "select top "+i+" * from wupin order by 物品ID desc";
    db.dbFill(selstr);
    dataGridView1.DataSource = db.dt;  
   }
   catch (Exception)
   {
    MessageBox.Show("不好意思，信息有误，注册失败");
   }
  }  
 
  private void caozuoyemain_Load(object sender, EventArgs e)
  {
   db.dbcon();
   string qingkong = "TRUNCATE TABLE wupin";
   db.dbInsert(qingkong);
   jisuanfangshi.SelectedIndex = 0;  
  }
 
  private void jiesuan_Click(object sender, EventArgs e)
  {
   shijijin = Convert.ToDouble(shishoujine.Text);
   yingzhao=Convert.ToDouble(zongjine.Text) ;
   yingzhao = shijijin - total;
   zhaojine.Text = yingzhao.ToString()+"元";
  }
 
  private void resetting_Click(object sender, EventArgs e)
  {
   tradeName.Text = "";
   price.Text = "";
   number.Text = "";
  }  
 }
}


								 
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