Question

我是c＃语言的新手，我有一个名为Mainwindow的表单：

public partial class MainWindow : Window
{
    ConnectionManager DatabaseConnect = new ConnectionManager();
    LoginController LoginControl = new LoginController();

    public MainWindow()
    {
        InitializeComponent();
    }

    private void Done_btn_Click(object sender, RoutedEventArgs e)
    {
        LoginControl.Login();
    }

    private void Close_btn_Click(object sender, RoutedEventArgs e)
    {
        this.Close();
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        DatabaseConnect.ConnectDatabase();
        Username_txtbox.Focus();
    }

    private void Username_txtbox_KeyDown(object sender, KeyEventArgs e)
    {
        LoginControl.KeyEnter(e);   
    }

    private void Password_txtbox_KeyDown(object sender, KeyEventArgs e)
    {
        LoginControl.KeyEnter(e);
    }

    private void Password_txtbox_KeyDown_1(object sender, KeyEventArgs e)
    {
        LoginControl.KeyEnter(e);
    }
}

LoginController类

class LoginController
{

    private ConnectionManager DatabaseConnect = new ConnectionManager();

    public void KeyEnter(KeyEventArgs e)
    {
        if (e.Key == Key.Enter)
        {   
            Login();
        }
    }

    public void Login()
    {
        MainWindow MainWindowPage = new MainWindow();
        DatabaseConnect.ConnectDatabase();

        System.Text.RegularExpressions.Regex EmailOnly = new Regex(@"^[a-zA-Z][\w\.-]{2,28}[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$");
         //Validates the textbox if it does not match the Regular expression of email address.

        if (!EmailOnly.IsMatch(MainWindowPage.Username_txtbox.Text))
        {
            MessageBox.Show("Invalid email address!");
            return;
        }
        else
        {
            if (MainWindowPage.Username_txtbox.Text.Length == 0 || MainWindowPage.Password_txtbox.Password.Length == 0)
            {
                MessageBox.Show("Enter on the login fields.");
            }
            if (MainWindowPage.Username_txtbox.Text != "" && MainWindowPage.Password_txtbox.Password != "")
            {
                DatabaseConnect.SqlStringQuery = "SELECT * FROM login_tbl WHERE user_email = '" + MainWindowPage.Username_txtbox.Text + "' AND password = '" + MainWindowPage.Password_txtbox.Password + "'";
                DatabaseConnect.Getdata();
                if (DatabaseConnect.SQLDR.HasRows == true)
                {
                    DatabaseConnect.SQLDR.Close();
                    AdminForm AdminForm = new AdminForm();
                    AdminForm.Show();
                    MainWindowPage.Close();
                }
                else
                {
                    DatabaseConnect.SQLDR.Close();
                    MessageBox.Show("Invalid user account!");
                }
            }
        }
    }
}

我尝试将Login（）代码放在正确验证的主窗口中，然后我将Login（）置于LoginController类中，但似乎该类无法在主窗口中检索文本框的值显示＆＃34;无效的电子邮件地址＆＃34;即使我在maindow文本框中添加了必要的值

有什么想法吗？

Answer 1

您的问题是，您在MainWindow方法中创建了一个名为MainWindowPage的新Login，其Username_txtbox的默认文字为空（我猜是这样）。 MainWindowPage不是您程序的主窗口。您必须在Login方法中传递当前主窗口。修改您的代码如下（只需稍加修改）：

public void Login(MainWindow MainWindowPage)
{
    DatabaseConnect.ConnectDatabase();
    //....
}

和...

private void Done_btn_Click(object sender, RoutedEventArgs e)
{
    LoginControl.Login(this);
}

类无法获得maindow形式的值

1 个答案: