Question

我有一个带有用户名和密码的LoginWindow可以在软件中访问，之后用户通过身份验证我想在下一个窗口中显示（软件的mainWindow）在TextBlock中验证的用户名...我展示了一个我的LoginWindow的代码片段：

public partial class Window1 : Window
{
    public Window1()
    {
        InitializeComponent();
    }

    public bool ValidateApplicationUser(string userName, string password)
    {
      {
            var AuthContext = new DataClasses1DataContext();
            var query = from c in  AuthContext.Users
                        where (c.Username == userName.ToLower() && c.Password == password.ToLower())
                        select c;

            if(query.Count() != 0 )
            {
                return true;
            }

            return false;
        }
    }

    private void mahhh(object sender, RoutedEventArgs e)
    {
        bool authenticated = true;
        {
            if (usernameTextBox.Text !="" && passwordTextBox.Text != "")
            {
                authenticated = ValidateApplicationUser(usernameTextBox.Text , passwordTextBox.Text);
            }
        }
        if (!authenticated)
        {
            MessageBox.Show("Invalid login. Try again.");
        }
        else
        {
            MessageBox.Show("Congradulations! You're a valid user!");
            MainWindow c = new MainWindow();
            c.ShowDialog();
        }
    }
}

如果我在MainWindow中使用用户名“Marc”进行身份验证，我将在TextBlock中显示用户名“Marc”，我不知道我是否已成功使用？我怎么能这样做？

Answer 1

我认为你在代码中有一些错误（它会允许空字段记录），它必须像：

 bool authenticated = true;
    {
        if (usernameTextBox.Text !="" && passwordTextBox.Text != "")
        {
            authenticated = ValidateApplicationUser(usernameTextBox.Text , passwordTextBox.Text);
        }


    }
    if (!authenticated || usernameTextBox.Text == "" || passwordTextBox.Text == "")
    {
        MessageBox.Show("Invalid login. Try again.");
    }
    else
    {
        MessageBox.Show("Congradulations! You're a valid user!");
        MainWindow c = new MainWindow();
        c.ShowDialog();

    }

Answer 2

简单地说，将UserName传递给主窗口的构造函数，如下所示

MainWindow c = New MainWindow(usernameTextBox.Text);

在主窗口的构造函数中接收变量中的值并随意执行任何操作，如下所示

private String _userName;

public MainWindow(string userName)
{ 
    _userName = userName
}

Answer 3

将一个公共变量/属性添加到您的MainWindow类

public string Username { get; set; }

现在你可以设置属性

MessageBox.Show("Congradulations! You're a valid user!");
MainWindow c = new MainWindow();
c.Username = usernameTextBox.Text;
c.ShowDialog();

并在您的MainWindow中使用它

MainWindow_Loaded(..) {      
   MessageBox.Show("You are " + Username);
}

绑定TextBlock Linq To Sql＆amp; WPF

3 个答案: