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C#图书管理系统设计第6页

更新时间：2010-2-28: 来源：毕业论文

C#图书管理系统设计第6页登录代码（Login）
namespace BookInfoM
{
    public partial class Login : Form
    {
        public static string[] LuserID;
        private int Logintimes=0;
        public Login()
        {
            InitializeComponent();
        }
        private void Login_Load(object sender, EventArgs e)
        {
            combUserID.Text = "";
            txtPassWord.Text = "";
        }

        private void btnLogin_Click(object sender, EventArgs e)
        {
            if (this.Text.Trim() != "")
            {
                if (txtPassWord.Text != "")
                {
                  SqlCommand command = CustomDataProvide.GetCommand(
"select * from UserInfo where UserID='" + combUserID.Text.Trim() +
"'and Password='" + txtPassWord.Text.Trim() + "'");
                    SqlDataReader dr;
                    try
                    {
                        command.Connection.Open();
                        dr = command.ExecuteReader();
                        dr.Read();
                        if (dr.HasRows)
                        {
                            Logintimes = 0;
                            Main main = new Main();
                            Main.LoginUser.UserID = dr.GetString(0);
                            Main.LoginUser .UserName = dr.GetString(1);
                            Main.LoginUser .Password = dr.GetString(2);
                            Main.LoginUser .Isadmin = dr.GetBoolean(3);
                            Main.LoginUser.Day = (Week )dr.GetInt32(4);
                            this.Hide();
                            main.Show();
                            dr.Close();
                            command.Connection.Close();
                            command.Dispose(); }
                        else
                        {   Logintimes++;
                            if (Logintimes == 3)
                            { MessageBox.Show("对不起,你登录的次数
已经超过三次!", "警告！");
                                Application.Exit();
                            }
                     if (BookInfoM.ClassCodes.DataValidate.IDExist("select
UserID from UserInfo where UserID='" + combUserID.Text.Trim().ToString()
+ "'") == true)
                         {   MessageBox.Show("密码不正确", "警告！");
                                txtPassWord.Text = "";   }
                            else
                          { MessageBox.Show("此用户ID不存在，请查
证后登录", "提示");
                                combUserID.Text = "";
                                txtPassWord.Text = "";
                            }   }   }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message, "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
                    }    }
                else
                { MessageBox.Show("密码不能为空", "提示"); }   }
            else
            {   MessageBox.Show("用户ID不能为空", "提示"); }   }
        private void btnExit_Click(object sender, EventArgs e)
        {
                if (MessageBox.Show("你确认要退出该程序吗？",
"提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question)
== DialogResult.Yes)
                Application.Exit();
        }    }