运行后 点击 btnLogin或者btnCancel 都没有反应 请各位高手看看有什么问题么~~
namespace exam
{
public partial class frmLogin : Form
{
public frmLogin()
{
InitializeComponent();
} private void frmLogin_Load(object sender, EventArgs e)
{
txtLoginName.Focus();
}
private void btnLogin_Click(object sender, EventArgs e)
{
try
{
if (txtLoginName.Text == "")
{
MessageBox.Show("用户名不能为空");
}
else
{
if (txtLoginPwd.Text == "")
{
MessageBox.Show("密码不能为空");
}
else
{
OleDbConnection conn = BaseClass.ConnClass.DataConn();
conn.Open();
OleDbCommand cmd = new OleDbCommand("select count(*) from tb_Student where name='" + txtLoginName.Text + "' and pwd='" + txtLoginPwd.Text + "'", conn);
int i = Convert.ToInt32(cmd.ExecuteScalar());
if (i > 0)
{
frmMain main = new frmMain();
main.adminname = txtLoginName.Text;
main.Show();
this.Hide();
}
else
{
MessageBox.Show("用户名或者密码错误");
}
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
} private void btnCancel_Click(object sender, EventArgs e)
{
Application.Exit();
} private void txtLoginPwd_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == 13)
{
btnLogin_Click(sender, e);
}
}
}
}
namespace exam
{
public partial class frmLogin : Form
{
public frmLogin()
{
InitializeComponent();
} private void frmLogin_Load(object sender, EventArgs e)
{
txtLoginName.Focus();
}
private void btnLogin_Click(object sender, EventArgs e)
{
try
{
if (txtLoginName.Text == "")
{
MessageBox.Show("用户名不能为空");
}
else
{
if (txtLoginPwd.Text == "")
{
MessageBox.Show("密码不能为空");
}
else
{
OleDbConnection conn = BaseClass.ConnClass.DataConn();
conn.Open();
OleDbCommand cmd = new OleDbCommand("select count(*) from tb_Student where name='" + txtLoginName.Text + "' and pwd='" + txtLoginPwd.Text + "'", conn);
int i = Convert.ToInt32(cmd.ExecuteScalar());
if (i > 0)
{
frmMain main = new frmMain();
main.adminname = txtLoginName.Text;
main.Show();
this.Hide();
}
else
{
MessageBox.Show("用户名或者密码错误");
}
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
} private void btnCancel_Click(object sender, EventArgs e)
{
Application.Exit();
} private void txtLoginPwd_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == 13)
{
btnLogin_Click(sender, e);
}
}
}
}
Cancel按钮,执行了Application.Exit();程序不会退出吗?
按钮跟事件绑定了吗?
this.btnLogin.Click += new EventHandler(btnLogin_Click);
this.btnCancel.Click += new EventHandler(btnCancel_Click);断点 调试了 也没发现任何情况, 这句话是什么意思?
该执行的代码都执行了吗?执行的结果是什么呢?