private void Add_Click(object sender, EventArgs e) { ResetLabel(); if (userName.Text.ToString().Trim().Length == 0) { nameLabel.Text = "用户名不应为空!"; return; } user.UserName = userName.Text.ToString().Trim(); if (passWord.Text.ToString().Trim().Length == 0) { passLabel.Text = "密码不应为空!"; return; } user.Password = passWord.Text.ToString().Trim(); if (user.Password != confirmWord.Text.ToString().Trim()) { confirmLabel.Text = "密码不一致!"; return; } int result = DAO.AddUser(user); switch (result) { case -1: MessageBox.Show("添加用户失败!"); break; case 0: MessageBox.Show("添加用户成功!"); this.Close(); Main main = new Main(); main.Show(); break; case 1: MessageBox.Show("程序异常!"); break; case 2: MessageBox.Show("用户名重复!"); break; } }