C#实现餐厅管理系统

本文实例为大家分享了c#实现餐厅管理系统的具体代码，供大家参考，具体内容如下

部分代码：

fm_change_password.cs

using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.text;
using system.windows.forms;
using system.io;
using system.data.sqlclient;

namespace foodmanage
{
 public partial class fm_change_password : form
 {
  public fm_change_password()
  {
   initializecomponent();
  }

  public string useridname = "";

  private void bt_ok_click(object sender, eventargs e)
  {
   sqlconnection conn=new sqlconnection(fm_public.strcon);
   conn.open();
   sqldataadapter sda = new sqldataadapter("select password from tuser where useridname='" + useridname + "'", conn);
   datatable dt=new datatable();
   sda.fill(dt);
   if(dt.rows[0]["password"].tostring()!=tb_oldpass.text)
   {
    messagebox.show("旧密码错误请重新输入");
    return;
   }
   if (tb_newpassw.text != tb_newpass.text)
   {
    messagebox.show("两次密码不相同请重新输入");
    return;
   }
   sqlcommand cmd = new sqlcommand("update tuser set password=@password where useridname='" + useridname + "'", conn);
   cmd.parameters.add("@password",sqldbtype.varchar,128).value=tb_newpassw.text;
   cmd.executenonquery();
   messagebox.show("修改密码成功！(*￣︶￣)y ");
   conn.close();
   this.close();
  }

  private void bt_esc_click(object sender, eventargs e)
  {
   this.close();
  }
 }
}

fm_login.cs

using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.text;
using system.windows.forms;
using system.data.sqlclient;

namespace foodmanage
{
 public partial class fm_login : form
 {
  public fm_login()
  {
   initializecomponent();
  }

  private void bt_login_click(object sender, eventargs e)
  {   
   //判断用户名或密码文本框是否为空
   if(tb_username.text==""||tb_password.text=="")
   {
    if(tb_username.text=="")
    {
     messagebox.show("用户名为空，请重新输入！(*￣︶￣)y ");
     return;
    }
    if (tb_password.text == "")
    {
     messagebox.show("密码为空，请重新输入！(*￣︶￣)y ");
     return;
    }
   }

   //连接数据库
   sqlconnection conn = new sqlconnection(fm_public.strcon);
   conn.open();
   string selectsql = "select * from tuser where useridname='" + tb_username.text + "'";
   sqldataadapter sda = new sqldataadapter(selectsql, conn);
   datatable dt = new datatable();
   sda.fill(dt);

   //判断用户是否存在
   if (dt.rows.count == 0)
   {
    messagebox.show("无该用户");
    return;
   }

   //判断用户名是否被锁定
   if (convert.toboolean(dt.rows[0]["lockif"]) == true)
   {
    messagebox.show("该用户已经被锁定，请联系管理员！/(ㄒoㄒ)/~~ ");
    return;
   }

   //更新数据库前的准备
   sqlcommand cmd = new sqlcommand();
   cmd.connection = conn;
   cmd.commandtype = commandtype.text;

   //判断输入密码是否正确，输入错误则“错误次数”+1，成功登录则“错误次数”清零
   if(tb_password.text!=dt.rows[0]["password"].tostring())
   {
    //错误次数+1
    cmd.commandtext = @"update tuser set errortime=errortime+1 where useridname=@username";
    cmd.parameters.add("@username", sqldbtype.varchar, 8);
    cmd.parameters["@username"].value = tb_username.text.trim();
    cmd.executenonquery();

    messagebox.show("密码错误请重新输入！/(ㄒoㄒ)/~~ ");
    return;
   }

   //经过以上验证用户名密码无错执行以下代码（设置错误次数为0）
   cmd.commandtext = "update tuser set errortime=0 where useridname=@username";
   cmd.parameters.add("@username", sqldbtype.varchar, 8);
   cmd.parameters["@username"].value = tb_username.text.trim();
   cmd.executenonquery();
   conn.close();   

   fm_public.loginsuccess = true;
   //设置用户权限以及初始化主界面的相关参数
   if (dt.rows[0]["post"].tostring() == "管理员")
   {
    fm_public.userpower = "管理员";
   }
   else
   {
    fm_public.userpower = "服务员";
   }
   fm_public.useridname = dt.rows[0]["useridname"].tostring();
   fm_public.logintime = datetime.now.toshortdatestring();

   this.close();
  }

  private void bt_esc_click(object sender, eventargs e)
  {
   if (messagebox.show("确定退出系统吗？", "提示", messageboxbuttons.okcancel, messageboxicon.asterisk) == dialogresult.ok)
   {
    application.exit();
   }
  }

  private void fm_login_activated(object sender, eventargs e)
  {
   tb_username.focus();
  }

  private void fm_login_load(object sender, eventargs e)
  {
   fm_start fm_starts = new fm_start();
   fm_starts.showdialog();
  }
 }
}

源码下载：c#实现餐厅管理系统

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