private void Button_Click(object sender, RoutedEventArgs e) { //获取用户输入的信息 string name = UserName.Text; string pwd = PassWord.Password; string Dname = DisplayName.Text; string OKpwd = OKPassWord.Password; //调用代码 if (name == "" || pwd == "" || Dname == "" || OKpwd == "") { MessageBox.Show("各项不可为空!"); } else { if (pwd != OKpwd) { MessageBox.Show("密码不一致!"); } else { UsersBll usersBll = new UsersBll(); UsersModel user = usersBll.CheckByName(name, Dname, Md5Helper.EncryptString(pwd)); if (user != null) { MessageBox.Show("该用户已存在!"); } else { MessageBox.Show("注册成功!"); } } } }