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使用C#怎么编写一个在线点餐系统
今天就跟大家聊聊有关使用C#怎么编写一个在线点餐系统，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
我们提供的服务有：网站设计制作、成都做网站、微信公众号开发、网站优化、网站认证、湘西土家族ssl等。为近千家企事业单位解决了网站和推广的问题。提供周到的售前咨询和贴心的售后服务，是有科学管理、有技术的湘西土家族网站制作公司
登录界面
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace MenuSystemWss
{
public partial class Form1 : Form
{
int dlsf=0;
/* SqlConnection sqlcon;
SqlCommand sqlcom;
SqlDataReader sqlsdr;*/
BaseInfo baseinfo = new BaseInfo();//
BaseInfo.GkInfo gkinfo = new BaseInfo.GkInfo();//
public Form1()
{
InitializeComponent();
}
public void dengluzt()
{
DataSet ds = null;
gkinfo.Gk_num = textBox1.Text.Trim();
ds = baseinfo.DengLu(gkinfo, "db_menu");
gkinfo.Gk_zt = 1;
gkinfo.Gk_apw = gkinfo.Gk_pw;
gkinfo.Gk_name = ds.Tables[0].Rows[0][1].ToString().Trim();
baseinfo.Updatgk(this.gkinfo);
}
private void button1_Click(object sender, EventArgs e)
{
if (radioButton1.Checked) dlsf = 1;
if (radioButton2.Checked) dlsf = 2;
if (textBox1.Text.Trim() == "")
{
label3.Text = "账号不能为空";
textBox1.Focus();
return;
}
else
if (textBox2.Text.Trim() == "")
{
label3.Text = "密码不能为空";
textBox1.Focus();
return;
}
else
if (dlsf == 2)
{
try
{
DataSet ds = null;
gkinfo.Gk_num = textBox1.Text.Trim();
gkinfo.Gk_pw = textBox2.Text.Trim();
ds = baseinfo.DengLu(gkinfo, "db_menu");
if (ds== null||ds.Tables.Count == 0||(ds.Tables.Count == 1 && ds.Tables[0].Rows.Count == 0))
{
MessageBox.Show("用户名错误！");
return;
}
else
if (ds.Tables[0].Rows[0][2].ToString().Trim() != textBox2.Text.Trim())
{ MessageBox.Show("密码错误"); }
else
{
MessageBox.Show("登陆成功！");
dengluzt();
gkfm fm = new gkfm();
fm.add (Convert.ToString(textBox1.Text));
fm.Show();
//this.Hide();
}
}
catch (Exception ee)
{
MessageBox.Show(ee.Message);
}
}
else
if (dlsf == 1)
{
if (textBox1.Text.Trim() == "1" && textBox2.Text.Trim() == "1")
{
MessageBox.Show("登录成功");
sjfm fm = new sjfm();
fm.Show();
// this.Hide();
}
else { MessageBox.Show("账号或密码错误！请重新输入！"); return; }
}
}
private void label3_Click(object sender, EventArgs e)
{
zcfm fm = new zcfm();
fm.Show();
this.Hide();
}
}
}注册界面
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace MenuSystemWss
{
public partial class zcfm : Form
{
BaseInfo baseinfo = new BaseInfo();//
BaseInfo.GkInfo gkinfo = new BaseInfo.GkInfo();//
/* SqlConnection sqlcon;
SqlCommand sqlcom;*/
public zcfm()
{
InitializeComponent();
}
private void label6_Click(object sender, EventArgs e)
{
Form1 fm = new Form1();
fm.Show();
this.Hide();
}
private void button1_Click(object sender, EventArgs e)
{
if (textBox1.Text.Trim() == "" || textBox1.Text.Length != 11)
{
MessageBox.Show( "手机号错误，请规范填写");
}
else
if (textBox2.Text.Trim() == "")
{
MessageBox.Show("用户名错误，请规范填写4-8位");
}
else
if (textBox3.Text.Trim() == "" || textBox3.Text.Length < 6 || textBox3.Text.Length > 8)
{
MessageBox.Show("密码错误，请规范填写6-8位！");
}
else
if (textBox4.Text.Trim() == "")
{
MessageBox.Show("密码错误，请规范填写6-8位!");
}
else
if (textBox3.Text.Trim() != textBox4.Text.Trim())
{
MessageBox.Show("两次输入密码必须一致!");
}
else
{
try
{
gkinfo.Gk_num = textBox1.Text.Trim();
gkinfo.Gk_name = textBox2.Text.Trim();
gkinfo.Gk_pw = textBox3.Text.Trim();
gkinfo.Gk_apw = textBox4.Text.Trim();
gkinfo.Gk_zt = 0;
int id = baseinfo.AddGk(gkinfo);
MessageBox.Show("注册成功！", "成功提示！", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ee){ MessageBox.Show(ee.Message); }
}
}
private void zcfm_Load(object sender, EventArgs e)
{
}
}
}商家界面：
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 MenuSystemWss
{
public partial class sjfm : Form
{
public sjfm()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
MenuShop fm = new MenuShop();
fm.Show();
}
private void button3_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void button2_Click(object sender, EventArgs e)
{
glfm fm = new glfm();
fm.Show();
}
}
}菜单管理
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 MenuSystemWss
{
public partial class MenuShop : Form
{
BaseInfo baseinfo = new BaseInfo();
BaseInfo.MenuInfo stockinfo = new BaseInfo.MenuInfo();
int kj_bz = 0;//控件状态标志
public MenuShop()
{
InitializeComponent();
}
private void clearText()
{
Textboxnum.Text = string.Empty;
TextboxName.Text = string.Empty;
Textboxgg.Text = string.Empty;
Textboxlx.Text = string.Empty;
Textboxdj.Text = string.Empty;
}
private void cancelEnabled()
{
groupBox1.Enabled = false;
tlBtnAdd.Enabled = true;
BtnEdit.Enabled = true;
BtnDelete.Enabled = true;
BtnSave.Enabled = false;
BtnCancel.Enabled = false;
}
private void LoadEnabled()
{
groupBox1.Enabled = false;
tlBtnAdd.Enabled = true;
BtnEdit.Enabled = true;
BtnDelete.Enabled = true;
BtnSave.Enabled = false;
BtnCancel.Enabled = false;
}
private void editEnabled()
{
groupBox1.Enabled = true;
tlBtnAdd.Enabled = false;
BtnEdit.Enabled = false;
BtnDelete.Enabled =false;
BtnSave.Enabled = true;
BtnCancel.Enabled = true;
}
private void AddEnabled()
{
Textboxdj.Text = "";
Textboxgg.Text = "";
Textboxnum.Text = "";
TextboxName.Text = "";
Textboxlx.Text = "";
groupBox1.Enabled = true;
tlBtnAdd.Enabled = false;
BtnEdit.Enabled = false;
BtnDelete.Enabled = false;
BtnSave.Enabled = true;
BtnCancel.Enabled = true;
}
private void MenuShop_Load(object sender, EventArgs e)
{
this.LoadEnabled();
dataGridView1.DataSource = baseinfo.GetAllmenu("db_menu").Tables[0].DefaultView;//展示菜品信息
this.SetdataGridView1HeadText();
}
private void SetdataGridView1HeadText()
{
dataGridView1.Columns[0].HeaderText = "菜品编号";
dataGridView1.Columns[1].HeaderText = "菜品名称";
dataGridView1.Columns[2].HeaderText = "菜品规格";
dataGridView1.Columns[3].HeaderText = "菜品类型";
dataGridView1.Columns[4].HeaderText = "菜品价格";
}
private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
Textboxnum.Text = this.dataGridView1[0, dataGridView1.CurrentCell.RowIndex].Value.ToString();//显示菜品编号
TextboxName.Text = this.dataGridView1[1, dataGridView1.CurrentCell.RowIndex].Value.ToString();//显示菜品全称
Textboxgg.Text = this.dataGridView1[2, dataGridView1.CurrentCell.RowIndex].Value.ToString();//显示菜品规格
Textboxlx.Text = this.dataGridView1[3, dataGridView1.CurrentCell.RowIndex].Value.ToString();//显示菜品类型
Textboxdj.Text = this.dataGridView1[4, dataGridView1.CurrentCell.RowIndex].Value.ToString();//显示菜品单价
}
public void labletime()
{
labelsj.Text = System.DateTime.Now.ToString();
}
private void timer1_Tick(object sender, EventArgs e)
{
labletime();
}
private void tlBtnExit_Click(object sender, EventArgs e)
{
this.Close();
//Application.Exit();
}
private void BtnDelete_Click(object sender, EventArgs e)
{
if (Textboxnum.Text.Trim() == string.Empty)
{
MessageBox.Show("删除--菜品数据--失败！", "错误提示！", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
stockinfo.Menu_num = Textboxnum.Text.Trim();
int id = baseinfo.Deletemenu(stockinfo);
MessageBox.Show("删除--库存商品数据--成功！", "成功提示！", MessageBoxButtons.OK, MessageBoxIcon.Information);
dataGridView1.DataSource = baseinfo.GetAllmenu("db_menu").Tables[0].DefaultView;
this.SetdataGridView1HeadText();
this.clearText();//清空文本框
}
private void BtnSave_Click(object sender, EventArgs e)
{
if (kj_bz == 0)
{
try
{
//添加数据
stockinfo.Menu_num =Textboxnum.Text;
stockinfo.Menu_name = TextboxName.Text;
stockinfo.Menu_gg = Textboxgg.Text;
stockinfo.Menu_lx= Textboxlx.Text;
stockinfo.Menu_dj = float.Parse( Textboxdj.Text.Trim());
//执行添加操作
int id = baseinfo.Addmenu(stockinfo);
MessageBox.Show("新增--库存商品数据--成功！", "成功提示！", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
else
{
//修改数据
stockinfo.Menu_num = Textboxnum.Text;
stockinfo.Menu_name = TextboxName.Text;
stockinfo.Menu_gg = Textboxgg.Text;
stockinfo.Menu_lx = Textboxlx.Text;
stockinfo.Menu_dj = float.Parse(Textboxdj.Text.Trim());
//执行修改操作
int id = baseinfo.Updatemenu(stockinfo);
MessageBox.Show("修改--库存商品数据--成功！", "成功提示！", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
dataGridView1.DataSource = baseinfo.GetAllmenu("db_menu").Tables[0].DefaultView;
this.SetdataGridView1HeadText();
this.cancelEnabled();//设置各个按钮的可用状态
}
private void BtnFind_Click(object sender, EventArgs e)
{
if (tlCmbStockType.Text == string.Empty)
{
MessageBox.Show("查询类别不能为空！", "错误提示！", MessageBoxButtons.OK, MessageBoxIcon.Error);
tlCmbStockType.Focus();
return;
}
else
if (tlCmbStockType.Text.Trim() == "全部")
{
dataGridView1.DataSource = baseinfo.GetAllmenu("db_menu").Tables[0].DefaultView;
this.SetdataGridView1HeadText();
return;
}
else
{
DataSet ds = null;
stockinfo.Menu_lx = tlCmbStockType.Text;
ds = baseinfo.FindmenuBylx(stockinfo, "db_menu");
dataGridView1.DataSource = ds.Tables[0].DefaultView;
this.SetdataGridView1HeadText();
}
}
private void BtnCancel_Click(object sender, EventArgs e)
{
this.cancelEnabled();
}
private void BtnEdit_Click(object sender, EventArgs e)
{
kj_bz = 1;
this.editEnabled();
}
private void tlBtnAdd_Click(object sender, EventArgs e)
{
this.AddEnabled();
kj_bz = 0;
}
}
}订单管理
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 MenuSystemWss
{
public partial class glfm : Form
{
BaseInfo baseinfo = new BaseInfo();
BaseInfo.Ddinfo dd = new BaseInfo.Ddinfo();
public glfm()
{
InitializeComponent();
}
private void glfm_Load(object sender, EventArgs e)
{
textBoxddxq.Enabled = false;
dataGridView1.DataSource = baseinfo.GetAlldd("db_dd").Tables[0].DefaultView;//展示订单信息
this.SetdataGridView1HeadText();
}
private void SetdataGridView1HeadText()
{
dataGridView1.Columns[0].HeaderText = "桌号";
dataGridView1.Columns[1].HeaderText = "顾客手机号";
dataGridView1.Columns[2].HeaderText = "订单详情";
dataGridView1.Columns[3].HeaderText = "订单总价";
dataGridView1.Columns[4].HeaderText = "订单时间";
}
private void toolStripButton1_Click(object sender, EventArgs e)
{
if (ComboBoxzh.Text == string.Empty)
{
MessageBox.Show("查询类别不能为空！", "错误提示！", MessageBoxButtons.OK, MessageBoxIcon.Error);
ComboBoxzh.Focus();
return;
}
else
if (ComboBoxzh.Text.Trim() == "全部")
{
dataGridView1.DataSource = baseinfo.GetAlldd("db_dd").Tables[0].DefaultView;
return;
}
if (ComboBoxzh.Text.Trim() == "已结账订单")
{
dataGridView1.DataSource = baseinfo.GetAllsydd("db_sydd").Tables[0].DefaultView;
//labelxfzj.Text = baseinfo.GetAllddsy("dd_sydd").ToString();
return;
}
else
{
DataSet ds = null;
dd.Dd_num = int.Parse(ComboBoxzh.Text);
ds = baseinfo.FindddByzh(dd, "db_dd");
dataGridView1.DataSource = ds.Tables[0].DefaultView;
this.SetdataGridView1HeadText();
if (ds == null || ds.Tables.Count == 0 || (ds.Tables.Count == 1 && ds.Tables[0].Rows.Count == 0))
{
textBoxddxq.Text = "";
}
else
{
textBoxddxq.Text = ds.Tables[0].Rows[0][2].ToString().Trim();
}
}
}
public void yjdd()
{
dataGridView1.DataSource = baseinfo.GetAlldd("db_sydd").Tables[0].DefaultView;
SetdataGridView1HeadText();
}
private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
ComboBoxzh.Text = this.dataGridView1[0, dataGridView1.CurrentCell.RowIndex].Value.ToString();
textBoxddxq.Text = this.dataGridView1[2, dataGridView1.CurrentCell.RowIndex].Value.ToString();
labelxfzj.Text = "本次消费总价为:" + this.dataGridView1[3, dataGridView1.CurrentCell.RowIndex].Value.ToString();
}
private void ExitBtn_Click(object sender, EventArgs e)
{
this.Close();
}
private void toolStripButton2_Click(object sender, EventArgs e)
{
if (ComboBoxzh.Text.Trim() != "")
{
dd.Dd_num = int.Parse(ComboBoxzh.Text.Trim());
dd.Zd_num = this.dataGridView1[1, dataGridView1.CurrentCell.RowIndex].Value.ToString();
dd.Dd_name = this.dataGridView1[2, dataGridView1.CurrentCell.RowIndex].Value.ToString();
dd.Dd_zj= float.Parse(this.dataGridView1[3, dataGridView1.CurrentCell.RowIndex].Value.ToString());
dd.Dd_time = this.dataGridView1[4, dataGridView1.CurrentCell.RowIndex].Value.ToString();
baseinfo.bcdd(dd);
baseinfo.Deletedd(dd);
MessageBox.Show("结账完成！");
dataGridView1.DataSource = baseinfo.GetAlldd("db_dd").Tables[0].DefaultView;
this.SetdataGridView1HeadText();
}
else
{
MessageBox.Show("请选择正确的桌号！");
return ;
}
}
}
}用户界面
using MenuSystemWss;
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 MenuSystemWss
{
public partial class gkfm : Form
{
BaseInfo baseinfo = new BaseInfo();
BaseInfo.GkInfo gkinfo = new BaseInfo.GkInfo();
BaseInfo.MenuInfo menu = new BaseInfo.MenuInfo();
BaseInfo.Ddinfo ddinfo = new BaseInfo.Ddinfo();
public double xfzj = 0;//消费总价
public string yhsj = "";//用户手机号
public int qxzt = 0;//点击取消时的状态
public gkfm()
{
InitializeComponent();
}
private void gkfm_Load(object sender, EventArgs e)
{
dataGridView1.DataSource =baseinfo.GetAllmenu("db_menu").Tables[0].DefaultView;//展示菜品信息
dataGridView1.ReadOnly = true;
this.SetdataGridView1HeadText();
load_Enable();
}
public void load_Enable()
{
cancelAll_Enable();
DataSet ds = null;
ddinfo.Zd_num = yhsj;
ds = baseinfo.FindddByzcnum(ddinfo, "db_dd");
if (ds == null || ds.Tables.Count == 0 || (ds.Tables.Count == 1 && ds.Tables[0].Rows.Count == 0))
{
comboBox1.Enabled = true;
tlBtnAdd.Enabled = true;
}
else {
jcBtn.Enabled = true;
comboBox1.Text= ds.Tables[0].Rows[0][0].ToString().Trim();
textBoxxq.Text = ds.Tables[0].Rows[0][2].ToString().Trim();
textBoxzj.Text = ds.Tables[0].Rows[0][3].ToString().Trim();
}
if (textBoxzj.Text.Trim() != "")
{
xfzj = Convert.ToDouble(textBoxzj.Text.Trim());
}
else
{
xfzj = 0;
}
if (textBoxxq.Text != "") qxzt = 1;
}
public void cancelAll_Enable()//关闭所有的控件
{
tlBtnAdd.Enabled = false;
BtnSave.Enabled = false;
BtnCancel.Enabled = false;
jcBtn.Enabled = false;
comboBox1.Enabled = false;
textBoxlx.Enabled = false;
textBoxdj.Enabled = false;
textBoxname.Enabled = false;
button1.Enabled = false;
textBoxzj.Enabled = false;
textBoxxq.Enabled = false;
}
public void jc_Enable()
{
BtnCancel.Enabled = true;
BtnSave.Enabled = true;
button1.Enabled = true;
}
public void add_Enable()
{
tlBtnAdd.Enabled = false;
BtnSave.Enabled = true;
BtnCancel.Enabled = true;
button1.Enabled = true;
}
public void cancel_Enable()
{
if (qxzt == 0)
{
cancelAll_Enable();
tlBtnAdd.Enabled = true;
comboBox1.Enabled = true;
xfzj = 0;
textBoxxq.Text = "";
}
else
{
BtnSave.Enabled = false;
BtnCancel.Enabled = false;
}
}
public void labletime()
{
labelTime.Text = System.DateTime.Now.ToString();
}
private void timer1_Tick(object sender, EventArgs e)
{
labletime();
}
private void SetdataGridView1HeadText()
{
dataGridView1.Columns[0].HeaderText = "菜品编号";
dataGridView1.Columns[1].HeaderText = "菜品名称";
dataGridView1.Columns[2].HeaderText = "菜品规格";
dataGridView1.Columns[3].HeaderText = "菜品类型";
dataGridView1.Columns[4].HeaderText = "菜品价格";
}
public void add(string strgk)
{
DataSet ds = null;
yhsj = strgk;
gkinfo.Gk_num = strgk;
ds = baseinfo.DengLu1(gkinfo, "db_menu");
label1.Text = ds.Tables[0].Rows[0][1].ToString().Trim() + "顾客您好 欢迎光临小帅饭店"; //**先生
}
private void BtnFind_Click(object sender, EventArgs e)
{
if (toolStripComboBox1.Text == string.Empty)
{
MessageBox.Show("查询类别不能为空！", "错误提示！", MessageBoxButtons.OK, MessageBoxIcon.Error);
toolStripComboBox1.Focus();
return;
}
else
if (toolStripComboBox1.Text.Trim() == "全部")
{
dataGridView1.DataSource = baseinfo.GetAllmenu("db_menu").Tables[0].DefaultView;
this.SetdataGridView1HeadText();
return;
}
else
{
DataSet ds = null;
menu.Menu_lx = toolStripComboBox1.Text;
ds = baseinfo.FindmenuBylx(menu, "db_menu");
dataGridView1.DataSource = ds.Tables[0].DefaultView;
this.SetdataGridView1HeadText();
}
}
private void toolStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
{
}
private void tlBtnAdd_Click(object sender, EventArgs e)
{
MessageBox.Show("请选择桌号！");
add_Enable();
}
private void BtnCancel_Click(object sender, EventArgs e)
{
cancel_Enable();
}
private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
textBoxname.Text = this.dataGridView1[1, dataGridView1.CurrentCell.RowIndex].Value.ToString();//显示菜品全称
textBoxlx.Text = this.dataGridView1[3, dataGridView1.CurrentCell.RowIndex].Value.ToString();//显示菜品类型
textBoxdj.Text = this.dataGridView1[4, dataGridView1.CurrentCell.RowIndex].Value.ToString();//显示菜品价格
}
private void tlBtnExit_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void button1_Click(object sender, EventArgs e)
{
textBoxxq.Text += textBoxname.Text.Trim() + "*1; ";
//listView1 .Items.Add(textBoxname.Text.Trim()+"*1;");
xfzj += Convert.ToDouble(textBoxdj.Text.Trim());
textBoxzj.Text = xfzj.ToString();
}
private void BtnSave_Click(object sender, EventArgs e)
{
if (comboBox1.Text == "") { MessageBox.Show("桌号不能为空！请选择桌号！");return; }
string strlist=textBoxxq.Text.Trim() ;
/* for (int i = 0; i < listView1.Items.Count; i++)
{
ListViewItem item = listView1.Items[i];
for (int j = 0; j < item.SubItems.Count; j++)
{
strlist += item.SubItems[j].Text;
}
}*/
if (qxzt == 0)
{
try
{
ddinfo.Dd_num = Convert.ToInt32(comboBox1.SelectedItem);
ddinfo.Zd_num = yhsj;
ddinfo.Dd_name = strlist;
ddinfo.Dd_zj = float.Parse(textBoxzj.Text);
ddinfo.Dd_time = System.DateTime.Now.ToString().Trim();
int id = baseinfo.Adddd(ddinfo);
MessageBox.Show("新增订单成功！", "成功提示！", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
else
{
ddinfo.Dd_num = Convert.ToInt32(comboBox1.SelectedItem);
ddinfo.Zd_num = yhsj;
ddinfo.Dd_name = strlist;
ddinfo.Dd_zj = float.Parse(textBoxzj.Text);
int id = baseinfo.Updatedd(ddinfo);
MessageBox.Show("菜品添加成功！");
}
////listView1.Clear();
qxzt = 1;
cancelAll_Enable();
jcBtn.Enabled = true;
}
private void jcBtn_Click(object sender, EventArgs e)
{
jc_Enable();
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
DataSet ds = null;
ddinfo.Dd_num = int.Parse(comboBox1.Text.Trim());
ds = baseinfo.FindddByzh(ddinfo, "db_dd");
if (ds == null || ds.Tables.Count == 0 || (ds.Tables.Count == 1 && ds.Tables[0].Rows.Count == 0))
{
comboBox1.Enabled = false;
}
// else { MessageBox.Show("桌号选择错误！请重新选择");comboBox1.Text = ""; return; }
}
}
}看完上述内容，你们对使用C#怎么编写一个在线点餐系统有进一步的了解吗？如果还想了解更多知识或者相关内容，请关注创新互联行业资讯频道，感谢大家的支持。
当前题目：使用C#怎么编写一个在线点餐系统
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