商品打折管理信息系统使用C#开发，使用软件是visual studio 2017

页面做的比较简单。
下图左边程序主界面，右边是各个页面的代码。

主程序入口代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;namespace sale
{static class Program{/// <summary>/// 应用程序的主入口点。/// </summary>[STAThread]static void Main(){Application.EnableVisualStyles();Application.SetCompatibleTextRenderingDefault(false);Application.Run(new Login());// Application.Run(new MainForm());//测试用}}
}

下面是主页面代码。

using System;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;namespace sale
{public partial class MainForm : Form{public MainForm(){InitializeComponent();}private void button3_Click(object sender, EventArgs e)//修改{Change form = new Change();form.Show();}private void listBox1_SelectedIndexChanged(object sender, EventArgs e){}private void button2_Click(object sender, EventArgs e)//添加{Add form = new Add();//新建一个对象，打开添加窗口form.Show();}private void button4_Click(object sender, EventArgs e)//删除 不会写直接删除，只好和其他一样，多做一个窗口{Delete form = new Delete();//打开删除的页面form.Show();}private void button5_Click(object sender, EventArgs e)//查询{if (this.textBox1.Text.Trim() == ""){MessageBox.Show("请输入要查询的商品名称", "提示");}else{string str = @"Data Source=zky\sqlexpress;Initial Catalog=sale;Integrated Security=True";SqlConnection conn = new SqlConnection(str);conn.Open();SqlCommand cmd = new SqlCommand();//绑定SqlConnection对象cmd.CommandText = "Select* from good where name_good='" + this.textBox1.Text.Trim() + "'";//cmd.Connection = conn;SqlDataAdapter sda = new SqlDataAdapter(cmd);DataSet ds = new DataSet();//数据集sda.Fill(ds);this.dataGridView1.DataSource = ds;this.dataGridView1.DataMember = ds.Tables[0].ToString();//依次赋值this.dataGridView1.AutoGenerateColumns =true;dataGridView1.ReadOnly = true;//不允许直接在列表上编辑dataGridView1.Columns[2].Visible = false;//第2列不出现在表中dataGridView1.Columns[4].Visible = false;//第4列不出现在表中dataGridView1.Columns[5].Visible = false;//第5列不出现在表中conn.Close();    }}private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)//主显示框{}private void dataGridView2_CellContentClick(object sender, DataGridViewCellEventArgs e){}private void MainForm_Load(object sender, EventArgs e){// TODO: 这行代码将数据加载到表“saleDataSet.good”中。您可以根据需要移动或删除它。this.goodTableAdapter.Fill(this.saleDataSet.good);}private void button6_Click(object sender, EventArgs e)//显示所有商品的信息{string str = @"Data Source=zky\sqlexpress;Initial Catalog=sale;Integrated Security=True";SqlConnection conn = new SqlConnection(str);conn.Open();SqlDataAdapter sqlDap = new SqlDataAdapter("Select Id_good,name_good,price,sale from good", conn);DataSet dds = new DataSet();//数据集sqlDap.Fill(dds);DataTable _table = dds.Tables[0];int count = _table.Rows.Count;dataGridView1.DataSource = _table;this.dataGridView1.AutoGenerateColumns = true;conn.Close();conn.Close();}private void label1_Click(object sender, EventArgs e){}private void label2_Click(object sender, EventArgs e){}private void textBox1_TextChanged(object sender, EventArgs e)//商品名称{}}
}

然后是登陆窗口

代码：

using System;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;
using System.Drawing;namespace sale
{public partial class Login : Form{public Login(){InitializeComponent();}public new FormStartPosition StartPosition { get; set; }private void button1_Click(object sender, EventArgs e)//注册{this.Hide();Register f5 = new Register();f5.ShowDialog();}//打开注册页面private void label2_Click(object sender, EventArgs e){}private void button2_Click(object sender, EventArgs e)//登陆{//数据库连接字符串（引号中的字符串为之前复制的那段字符）  //Data source=服务器名，Initial catalog=数据库名，User Id=sqlserver连接名，  //Password=数据库连接密码,integrated Security=True  string str = @"Data Source=zky\sqlexpress;Initial Catalog=sale;Integrated Security=True";SqlConnection conn = new SqlConnection(str);conn.Open();string selectsql = "Select * from login where username = '" + textBox1.Text + "' and password='" + textBox2.Text + "'";SqlCommand cmd = new SqlCommand(selectsql, conn); //SqlCommand对象允许你指定在数据库上执行的操作的类型。  cmd.CommandType = CommandType.Text;//这就是告诉cmd执行的sql是你赋给CommandText的值里写出的sql语句，如果是存储过程的话cmd.CommandType = CommandType.StoredProcedure;//然后CommandText='存储过程的名字'，这就是告诉cmd执行的是存储过程，  //存储过程的名字就是CommandText的值  SqlDataReader sdr;sdr = cmd.ExecuteReader();if (sdr.Read())//显示登录界面；{MessageBox.Show("登陆成功", "提示");MainForm  form= new MainForm();//登陆成功显示主界面  // MainForm.StartPosition = FormStartPosition.CenterScreen;form.Show();}else{MessageBox.Show("登陆失败!请检查用户名或者密码重新登陆！", "提示");//弹出窗口提示用户                                   return;}conn.Close();}private void Form4_Load(object sender, EventArgs e){}private void label3_Click_1(object sender, EventArgs e){}private void textBox2_TextChanged(object sender, EventArgs e){}}
}

using System;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;namespace sale
{public partial class Register : Form{public Register(){InitializeComponent();}private void label1_Click(object sender, EventArgs e){}private void label2_Click(object sender, EventArgs e){}private void button1_Click(object sender, EventArgs e){string str = @"Data Source=zky\sqlexpress;Initial Catalog=sale;Integrated Security=True";SqlConnection conn = new SqlConnection(str);conn.Open();string selectsql = "select username from login";//验证用户名是否重复          SqlCommand com = new SqlCommand(selectsql, conn);SqlDataReader reader;reader = com.ExecuteReader();while(reader.Read())if (textBox1.Text == reader["username"].ToString().Trim()){MessageBox.Show("用户名已经存在，请重新输入！", "提示");//弹出窗口提示用户return;}else if (textBox1.Text != reader["username"].ToString().Trim())//注册成功显示登陆页面 {conn.Close();conn.Open();string insertsql = "insert into login values('" + textBox1.Text + "','" + textBox2.Text + "') ";SqlCommand cmd = new SqlCommand(insertsql, conn);// 定义cmd对象并连接数据库cmd.CommandType = CommandType.Text;//存储过程cmd.ExecuteNonQuery();MessageBox.Show("恭喜您，注册成功！", "提示");this.Close();//关闭注册窗口Login form = new Login(); //打开登陆窗口form.Show();return;}conn.Close();// 关闭对象并释放所占内存空间conn.Dispose();}private void Form5_Load(object sender, EventArgs e){}}
}

添加页面：

代码：

using System;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;namespace sale
{public partial class Add : Form{public Add(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){string code;code = Convert.ToString(this.textBox1.Text);System.Text.RegularExpressions.Regex regex = new System.Text.RegularExpressions.Regex(@"'", System.Text.RegularExpressions.RegexOptions.IgnoreCase);code = regex.Replace(code, " ");string str = @"Data Source=zky\sqlexpress;Initial Catalog=sale;Integrated Security=True";SqlConnection conn = new SqlConnection(str);conn.Open();string sql = "select count(*) from good where Id_good=('" + code + "')";SqlCommand cmd1 = new SqlCommand(sql, conn);int count = (int)cmd1.ExecuteScalar();if (count > 1)MessageBox.Show("商品已经！", "提示");else{SqlCommand cmd = conn.CreateCommand();//值得注意cmd.CommandText = "insert into good(Id_good,name_good,sale,price,Id_supplier,Id_shelf,Id_kind) values (@Id_good,@sale,@name_good,@price,@Id_supplier,@Id_shelf,@Id_kind)";//注意逗号用英文的cmd.Parameters.Add("@Id_good", SqlDbType.NVarChar);//cmd.Parameters.Add("@sale", SqlDbType.VarChar, 20);cmd.Parameters.Add("@price", SqlDbType.VarChar, 50);cmd.Parameters.Add("@name_good", SqlDbType.VarChar, 20);cmd.Parameters.Add("@Id_supplier", SqlDbType.NVarChar);cmd.Parameters.Add("@Id_kind", SqlDbType.NVarChar);cmd.Parameters.Add("@Id_shelf", SqlDbType.NVarChar);cmd.Parameters["@Id_good"].Value = textBox1.Text.Trim();cmd.Parameters["@sale"].Value = textBox2.Text.Trim();cmd.Parameters["@price"].Value = textBox3.Text.Trim();cmd.Parameters["@name_good"].Value = textBox4.Text.Trim();cmd.Parameters["@Id_supplier"].Value = textBox5.Text.Trim();cmd.Parameters["@Id_kind"].Value = textBox6.Text.Trim();cmd.Parameters["@Id_shelf"].Value = textBox7.Text.Trim();try{conn.Open();if (cmd.ExecuteNonQuery() == 1)MessageBox.Show("商品写入成功！", "提示");}catch{MessageBox.Show("商品已存在，写入失败！", "提示");this.Close();}//cmd.ExecuteNonQuery();//增加了一条新纪录，所以返回1/*if (cmd.ExecuteNonQuery() > 0)MessageBox.Show( "数据写入成功！", "提示");elseMessageBox.Show("数据写入错误！", "提示");*/conn.Close();this.Close();}}private void button2_Click(object sender, EventArgs e){this.Close();}private void textBox1_TextChanged(object sender, EventArgs e){}private void textBox2_TextChanged(object sender, EventArgs e){}private void textBox3_TextChanged(object sender, EventArgs e){}private void textBox4_TextChanged(object sender, EventArgs e){}private void label1_Click(object sender, EventArgs e){}private void textBox5_TextChanged(object sender, EventArgs e)//供货商{}private void textBox7_TextChanged(object sender, EventArgs e)//货架{}private void textBox6_TextChanged(object sender, EventArgs e)//kind 类型{}private void label5_Click(object sender, EventArgs e){}}
}

删除：

代码：

using System;
using System.Data.SqlClient;
using System.Windows.Forms;
using System.Data;namespace sale
{public partial class Delete : Form{public Delete(){InitializeComponent();}private void textBox1_TextChanged(object sender, EventArgs e){}private void button2_Click(object sender, EventArgs e){this.Close();}private void button1_Click(object sender, EventArgs e){string str = @"Data Source=zky\sqlexpress;Initial Catalog=sale;Integrated Security=True";SqlConnection conn = new SqlConnection(str);conn.Open();SqlCommand cmd = new SqlCommand("delete from good where Id_good='" + this.textBox1.Text.Trim() + "'");cmd.Connection = conn;cmd.Parameters.Add("@Id_good", SqlDbType.NVarChar);cmd.Parameters["@Id_good"].Value = textBox1.Text.Trim();cmd.ExecuteNonQuery();conn.Close();this.Close();}private void label1_Click(object sender, EventArgs e){}private void Delete_Load(object sender, EventArgs e){}}
}

修改：

代码：

using System;
using System.Data;
using System.Windows.Forms;
using System.Data.SqlClient;namespace sale
{public partial class Change : Form{public Change(){InitializeComponent();}private void Form3_Load(object sender, EventArgs e){}private void button2_Click(object sender, EventArgs e){this.Close();}private void textBox2_TextChanged(object sender, EventArgs e){}private void button1_Click(object sender, EventArgs e){if (textBox2.Text.Trim() == "" || textBox3.Text.Trim() == "" ){MessageBox.Show("请输入完整信息！", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);}else{string str = @"Data Source=zky\sqlexpress;Initial Catalog=sale;Integrated Security=True";SqlConnection conn = new SqlConnection(str);conn.Open();SqlCommand cmd = new SqlCommand();cmd.CommandText = "update good set  sale=@sale  where Id_good=@Id_good";cmd.Connection = conn;cmd.Parameters.Add("@Id_good", SqlDbType.NVarChar);cmd.Parameters.Add("@sale", SqlDbType.VarChar, 50);cmd.Parameters["@Id_good"].Value = textBox2.Text.Trim();cmd.Parameters["@sale"].Value = textBox3.Text.Trim();cmd.ExecuteNonQuery();conn.Close();this.Close();}}private void textBox3_TextChanged(object sender, EventArgs e){}}
}

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商品打折管理信息系统使用C#开发，使用软件是visual studio 2017

商品打折管理信息系统使用C#开发，使用软件是visual studio 2017相关推荐

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商品打折管理信息系统 使用C#开发，使用软件是visual studio 2017

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商品打折管理信息系统使用C#开发，使用软件是visual studio 2017

商品打折管理信息系统使用C#开发，使用软件是visual studio 2017相关推荐