frmlogin.cs

图书馆管理系统的一个代码 很好的学习借鉴

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace BookManagementSystem
{
    public partial class frmLogin : Form
    {
        private Boolean IsPass;
        private int count = 0;
        public frmLogin()
        {
            InitializeComponent();
        }

        private void frmLogin_FormClosing(object sender, FormClosingEventArgs e)
        {
            Program.DataOperator.CloseConnection();
            Environment.Exit(1);
        }

        private void BtnLogin_Click(object sender, EventArgs e)
        {
            if (account.Text.Equals(""))
            {
                MessageBox.Show("帐号不能为空");
                return;
            }
            if (checkBox.Checked)
            {
                Program.IsAdministrator = true;
                IsPass = Program.DataOperator.CheckAdmin(account.Text, password.Text);
                if (IsPass)
                {
                    Program.CurrentAccount = account.Text;
                    this.Dispose();
                }
            }
            else
            {
                Program.IsAdministrator = false;
                IsPass = Program.DataOperator.CheckUser(account.Text, password.Text);
                if (IsPass)
                {
                    Program.CurrentAccount = account.Text;
                    this.Dispose();
                }
            }
            
            MessageBox.Show("帐号或密码错误");
            count++;
            if (count == 5)
            {

                MessageBox.Show("错误登录次数太多!", "错误",MessageBoxButtons.OK,MessageBoxIcon.Error);
                Program.DataOperator.CloseConnection();
                Environment.Exit(1);
            }
            return;
        }

        private void name_KeyPress(object sender, KeyPressEventArgs e)
        {
            BtnLogin.Enabled = true;
        }

        private void BtnExit_Click(object sender, EventArgs e)
        {
            Program.DataOperator.CloseConnection();
            Environment.Exit(1);
        }

        private void frmLogin_Load(object sender, EventArgs e)
        {
            account.Focus();
        }

      

    }
}